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Independent city and Counties of Missouri
Independent city and Counties of Missouri
	AT HO ND AN BH PL CY CT DK GY WO HA DV CD RY CR LV GN ME PM SV LI CN RH MC AD SR SD CK KX LW SH MN MR RS AU PI LN MY CW BN HW SA LF JK CS JO PE CP MG MO CO ML OS MA GA WN CH FK SL ←LC JE SG PY SF MI IR WA CF PH PU CM HI BE HE BA CL VE CE BT DD PK DA GR XN WB LA WR DG TX DT SN RN WY BO CG ST SC MS NM PS DU BU CA RI OR HL OZ TA SE LR JA NN BY MD
Location	State of Missouri
Number	114 counties; 1 independent city
Populations	1,907 (Worth) – 987,059 (St. Louis)
Areas	266 square miles (690 km2) (Worth) – 1,179 square miles (3,050 km2) (Texas)
Government	County government;
Subdivisions	cities, towns, unincorporated communities, census designated place;

There are 114 counties and one independent city in the U.S. State of Missouri. Following the Louisiana Purchase and the admittance of Louisiana into the United States in 1812, five counties were formed out of the Missouri Territory at the first general assembly: Cape Girardeau, New Madrid, Saint Charles, Saint Louis, and Ste. Genevieve. Most subsequent counties were apportioned from these five original counties. Six more counties were added through the 1836 Platte Purchase, the acquired lands of which formed the northwest tip of the state and consisted of Andrew, Atchison, Buchanan, Holt, Nodaway, and Platte counties.^[1]

In Missouri, the county level of government comes between those of the city and the state. Its primary responsibilities include maintaining roads, providing security, prosecuting criminals, and collecting taxes. Elected officials at this level include a sheriff, prosecuting attorney, and assessor.^[2]

Most of the counties in Missouri are named after politicians. One such county, Cass, was originally named Van Buren County after President Martin Van Buren, and was changed to its present name in support of Van Buren's Democratic opponent Lewis Cass during the presidential election of 1848. Other counties are named after war heroes, natural resources, explorers, and former U.S. territories.^[3]

The city of St. Louis is an independent city, and is not within the limits of a county. Its residents voted to secede from St. Louis County in 1876. Throughout the United States, St. Louis is one of three independent cities outside the state of Virginia (the other two are Baltimore, Maryland, and Carson City, Nevada).^[4]

Population figures are based on the 2023 Census estimate. According to that census estimate, the population of Missouri is 6,196,156, an increase of 0.7% from 2020. The average population of Missouri's counties is 53,880; St. Louis County is the most populous (987,059), and Worth County is the least (1,907). The average land area is 599 sq mi (1,550 km²). The largest county is Texas County (1,179 sq mi, 3,054 km²) and the smallest is St. Louis city (61.9 sq mi, 160 km²).^[5]^[6]

The Federal Information Processing Standard (FIPS) is used by the U.S. government to uniquely identify counties, and is provided for each entry. These codes link to the United States Census Bureau's "quick facts" for each county. To distinguish from counties in other states, one must use Missouri's FIPS code, 29. For example, Adair County's unique nationwide identifier is 29001.^[7]

Counties


County	FIPS code^[7]	County seat^[8]	Est.^[8]	Formed from^[3]	Etymology^[3]^[9]^[10]	Population^[11]	Area^[8]
Adair County	001	Kirksville	1841	Macon County	John Adair (1757–1840), pioneer, soldier, and seventh Governor of Kentucky	25,122	568 sq mi (1,471 km²)
Andrew County	003	Savannah	1841	Part of the Platte Purchase	Andrew Jackson Davis , a prominent citizen of St. Louis	18,127	435 sq mi (1,127 km²)
Atchison County	005	Rock Port	1843	Holt County, part of the Platte Purchase	U.S. Senator David Rice Atchison (1807–1886), a Democrat from Missouri	5,107	545 sq mi (1,412 km²)
Audrain County	007	Mexico	1831	Callaway, Monroe and Ralls counties	James Hunter Audrain, a War of 1812 colonel Missouri State Legislator	24,394	693 sq mi (1,795 km²)
Barry County	009	Cassville	1835	Greene County	William Taylor Barry (1784–1835), jurist and United States Postmaster General	35,265	779 sq mi (2,018 km²)
Barton County	011	Lamar	1855	Jasper County	U.S. Senator David Barton (1783–1837), one of the first senators from Missouri	11,731	594 sq mi (1,538 km²)
Bates County	013	Butler	1841	Van Buren (now Cass) County	Frederick Bates (1777–1825), the second governor of Missouri	16,242	848 sq mi (2,196 km²)
Benton County	015	Warsaw	1835	Pettis and Greene counties	Thomas Hart Benton (1782–1858), U.S. Senator from Missouri	20,552	706 sq mi (1,829 km²)
Bollinger County	017	Marble Hill	1851	Cape Girardeau, Madison, Stoddard and Wayne counties	George Frederick Bollinger (1770–1842), early settler of Missouri	10,544	621 sq mi (1,608 km²)
Boone County	019	Columbia	1820	Howard County	Daniel Boone (1734–1820), American pioneer and hunter	189,463	685 sq mi (1,774 km²)
Buchanan County	021	Saint Joseph	1838	Part of the Platte Purchase	James Buchanan (1791–1868), 15th President of the United States	82,956	410 sq mi (1,062 km²)
Butler County	023	Poplar Bluff	1849	Wayne County	William O. Butler (1791–1880), U.S. Representative from Kentucky and vice-presidential nominee under Lewis Cass	41,948	698 sq mi (1,808 km²)
Caldwell County	025	Kingston	1836	Ray County	Disputed; either John Caldwell, an Indian scout and friend of respected Colonel Alexander William Doniphan; John Caldwell, Lieutenant Governor of Kentucky; or Mathew Caldwell, a signer of the Texas Declaration of Independence	8,955	429 sq mi (1,111 km²)
Callaway County	027	Fulton	1821	Boone, Howard and Montgomery counties	James Callaway (1783–1815), soldier during the War of 1812 and grandson of Daniel Boone	44,731	839 sq mi (2,173 km²)
Camden County	029	Camdenton	1841	Benton, Morgan and Pulaski counties	Charles Pratt, 1st Earl Camden (1714–1794), an English lawyer, judge, Whig politician, and proponent of civil liberties	44,044	655 sq mi (1,696 km²)
Cape Girardeau County	031	Jackson	1812	One of the five original counties	A rock promontory over the Mississippi River and Ensign Sieur Jean Baptiste de Girardot, a French officer and early explorer of the region	82,984	579 sq mi (1,500 km²)
Carroll County	033	Carrollton	1833	Ray County	Charles Carroll (1737–1832), delegate to the Continental Congress and U.S. Senator for Maryland	8,391	695 sq mi (1,800 km²)
Carter County	035	Van Buren	1859	Oregon, Reynolds, Ripley and Shannon counties	Zimri Carter (1794-1872), a pioneering settler	5,303	508 sq mi (1,316 km²)
Cass County	037	Harrisonville	1833	Jackson County	Lewis Cass (1782–1866), senator from Michigan	111,732	699 sq mi (1,810 km²)
Cedar County	039	Stockton	1845	Dade and St. Clair counties	Named for the abundance of Eastern Red Cedar trees	14,672	476 sq mi (1,233 km²)
Chariton County	041	Keytesville	1821	Howard County	Chariton River, a tributary of the Missouri River, whose naming origin is disputed	7,399	756 sq mi (1,958 km²)
Christian County	043	Ozark	1859	Greene, Taney and Webster counties	William Christian (1743–1786), colonel in the American Revolution	94,422	563 sq mi (1,458 km²)
Clark County	045	Kahoka	1836	Lewis County	William Clark (1770–1838), American explorer, soldier, Indian agent, and territorial governor	6,641	507 sq mi (1,313 km²)
Clay County	047	Liberty	1822	Ray County	Henry Clay (1777–1852), American Senator and orator from Kentucky	259,772	396 sq mi (1,026 km²)
Clinton County	049	Plattsburg	1833	Clay County	George Clinton (1739–1812), soldier and Governor of New York, considered one of the Founding Fathers of the United States	21,548	419 sq mi (1,085 km²)
Cole County	051	Jefferson City	1820	Cooper County	Stephen Cole, pioneering settler	77,278	392 sq mi (1,015 km²)
Cooper County	053	Boonville	1818	Howard County	Sarshel Benjamin Cooper, pioneering settler	16,947	565 sq mi (1,463 km²)
Crawford County	055	Steelville	1829	Gasconade County	William H. Crawford (1772–1834), U.S. Senator from Georgia, U.S. Secretary of Treasury, and judge	22,719	743 sq mi (1,924 km²)
Dade County	057	Greenfield	1841	Barry and Polk counties	Major Francis L. Dade (1793?–1835), Major in the U.S. 4th Infantry Regiment, United States Army, during the Second Seminole War	7,716	490 sq mi (1,269 km²)
Dallas County	059	Buffalo	1841	Polk County	George M. Dallas (1792–1864), U.S. Vice President under James K. Polk	17,768	542 sq mi (1,404 km²)
Daviess County	061	Gallatin	1836	Ray County	Joseph Hamilton Daveiss (1774–1811), commanded the Dragoons of the Indiana Militia at the Battle of Tippecanoe	8,551	567 sq mi (1,469 km²)
DeKalb County	063	Maysville	1843	Clinton County	Johann de Kalb (1721–1780), a German soldier who served as a major general in the Continental Army during the American Revolutionary War	9,899	424 sq mi (1,098 km²)
Dent County	065	Salem	1851	Crawford and Shannon counties	James Dent, pioneering settler	14,647	754 sq mi (1,953 km²)
Douglas County	067	Ava	1857	Ozark County	Stephen A. Douglas (1813–1861), American Senator from Illinois, and the Democratic nominee for President in 1860	12,228	815 sq mi (2,111 km²)
Dunklin County	069	Kennett	1843	Stoddard County	Daniel Dunklin (1790–1844), fifth governor of Missouri	27,032	546 sq mi (1,414 km²)
Franklin County	071	Union	1818	St. Louis County	Benjamin Franklin (1706–1790), writer, publisher, orator, and one of the Founding Fathers of the United States	106,404	922 sq mi (2,388 km²)
Gasconade County	073	Hermann	1821	Franklin County	Gasconade River, a tributary of the Missouri River; the river probably derives its name from the French word "gascon" which means braggart, and could be an old satirical name describing those who boast about their adventures upon return to St. Louis	14,705	520 sq mi (1,347 km²)
Gentry County	075	Albany	1841	Clinton County	Richard Gentry (1788–1837), a distinguished American military colonel in the Seminole Wars	6,287	492 sq mi (1,274 km²)
Greene County	077	Springfield	1833	Crawford and Wayne counties	Nathanael Greene (1742–1786), a major general of the Continental Army in the American Revolutionary War	304,611	675 sq mi (1,748 km²)
Grundy County	079	Trenton	1839	Livingston County	Felix Grundy (1777–1840), U.S. Congressman and U.S. Senator from Tennessee who also served as the 13th Attorney General of the United States	9,815	436 sq mi (1,129 km²)
Harrison County	081	Bethany	1843	Daviess County	Albert G. Harrison (1800–1839), U.S. Representative from Missouri	8,220	725 sq mi (1,878 km²)
Henry County	083	Clinton	1834	Lillard (now Lafayette) County	Patrick Henry (1736–1799), first post-colonial Governor of Virginia and prominent figure in the American Revolution	22,485	702 sq mi (1,818 km²)
Hickory County	085	Hermitage	1845	Benton and Polk counties	Andrew Jackson (1767–1845), seventh U.S. President, who was nicknamed "Old Hickory" during his military service	8,718	399 sq mi (1,033 km²)
Holt County	087	Oregon	1841	Part of the Platte Purchase	David Rice Holt, Missouri State Representative	4,248	462 sq mi (1,197 km²)
Howard County	089	Fayette	1816	St. Charles and St. Louis counties	Benjamin Howard (1760–1814), a Congressman from Kentucky, governor of Missouri Territory and a brigadier general in the War of 1812	10,101	466 sq mi (1,207 km²)
Howell County	091	West Plains	1857	Oregon County	Disputed – Josiah Howell, pioneering settler	40,735	928 sq mi (2,404 km²)
Iron County	093	Ironton	1857	Madison, Reynolds, St. Francois, Washington and Wayne counties	The abundance of iron ore in the area	9,440	551 sq mi (1,427 km²)
Jackson County	095	Independence, Kansas City	1826	Lillard (now Lafayette) County	Andrew Jackson (1767–1845), U.S. Senator from Tennessee and later 7th President of the United States from 1829 to 1837	718,560	605 sq mi (1,567 km²)
Jasper County	097	Carthage	1841	Barry County	William Jasper (c. 1750–1779), a noted American soldier in the Revolutionary War	125,056	640 sq mi (1,658 km²)
Jefferson County	099	Hillsboro	1818	St. Louis and Sainte Genevieve counties	Thomas Jefferson (1743–1826), third President of the United States, principal author of the Declaration of Independence, and one of the most influential Founding Fathers	231,230	657 sq mi (1,702 km²)
Johnson County	101	Warrensburg	1834	Lillard (now Lafayette) County	Richard M. Johnson (1780–1850), ninth Vice President of the United States, serving in the administration of Martin Van Buren	54,962	831 sq mi (2,152 km²)
Knox County	103	Edina	1843	Scotland County	Henry Knox (1750–1806) an American bookseller from Boston who became the chief artillery officer of the Continental Army and later the nation's first Secretary of War	3,723	506 sq mi (1,311 km²)
Laclede County	105	Lebanon	1849	Camden, Pulaski and Wright counties	Pierre Laclede (1729–1778), founder of St. Louis, Missouri	36,680	766 sq mi (1,984 km²)
Lafayette County	107	Lexington	1821	Cooper County	Gilbert du Motier, the Marquis de Lafayette (1757–1834), French military officer and general in the American Revolutionary War	33,196	629 sq mi (1,629 km²)
Lawrence County	109	Mount Vernon	1843	Barry and Dade counties	James Lawrence (1781–1813), an American naval officer best known for his last words "Don't give up the ship!"	38,872	613 sq mi (1,588 km²)
Lewis County	111	Monticello	1833	Marion County	Meriwether Lewis (1774–1809), explorer and governor of the Louisiana Territory	9,818	505 sq mi (1,308 km²)
Lincoln County	113	Troy	1818	St. Charles County	Disputed; either Lincoln County, Kentucky (birthplace of Christopher Clark, a Missouri legislator who advocated for the county's creation),^[12] or for Benjamin Lincoln (1733–1810), an American revolutionary war general	64,699	630 sq mi (1,632 km²)
Linn County	115	Linneus	1837	Chariton County	Lewis F. Linn (1796–1843), a Jacksonian Democratic U.S. Senator for Missouri	11,791	620 sq mi (1,606 km²)
Livingston County	117	Chillicothe	1837	Carroll County	Edward Livingston (1764–1836), a prominent American jurist and statesman, influential in the drafting of the Louisiana Civil Code of 1825, a civil code based largely on the Napoleonic Code	14,557	535 sq mi (1,386 km²)
Macon County	121	Macon	1837	Chariton and Randolph counties	Nathaniel Macon (1758–1837), member of the United States House of Representatives from 1791 to 1815 who briefly served in the American Revolutionary War	15,161	804 sq mi (2,082 km²)
Madison County	123	Fredericktown	1818	Cape Girardeau and Sainte Genevieve counties	James Madison (1751–1836), politician and political philosopher who served as the fourth President of the United States, and one of the Founding Fathers of the United States	12,698	497 sq mi (1,287 km²)
Maries County	125	Vienna	1855	Osage and Pulaski counties	Maries River, possibly a corruption of the French word marais meaning "marsh" or "swamp"	8,430	528 sq mi (1,368 km²)
Marion County	127	Palmyra	1826	Ralls County	Francis Marion (1732–1795), a military officer who served in the American Revolutionary War	28,336	438 sq mi (1,134 km²)
McDonald County	119	Pineville	1847	Newton County	Alexander McDonald, American Revolutionary War sergeant	23,903	540 sq mi (1,399 km²)
Mercer County	129	Princeton	1845	Grundy County	John F. Mercer (1759–1821), an American lawyer, planter, and Governor of Maryland	3,469	454 sq mi (1,176 km²)
Miller County	131	Tuscumbia	1837	Cole and Pulaski counties	John Miller (1781–1846), an American publisher and politician from St. Louis, Missouri. He was the fourth Governor of Missouri and represented Missouri in the U.S. House	25,590	592 sq mi (1,533 km²)
Mississippi County	133	Charleston	1842	Scott County	Mississippi River, the second-longest river in the United States which forms Missouri's eastern border	11,822	413 sq mi (1,070 km²)
Moniteau County	135	California	1845	Cole and Morgan counties	Moniteau Creek; "moniteau" is a French spelling of manitou, the Algonquian Great Spirit	15,256	417 sq mi (1,080 km²)
Monroe County	137	Paris	1831	Ralls County	James Monroe (1758–1831), fifth President of the United States who crafted the Missouri Compromise	8,698	646 sq mi (1,673 km²)
Montgomery County	139	Montgomery City	1818	St. Charles County	Richard Montgomery (1738–1775), an Irish-born soldier who first served in the British Army and later became a brigadier-general in the Continental Army during the Revolutionary War	11,459	539 sq mi (1,396 km²)
Morgan County	141	Versailles	1833	Cooper County	Daniel Morgan (c. 1736–1802), American pioneer, soldier, and United States Representative from Virginia	21,970	598 sq mi (1,549 km²)
New Madrid County	143	New Madrid	1812	One of the five original counties	Madrid, Spain	15,424	678 sq mi (1,756 km²)
Newton County	145	Neosho	1838	Barry County	John Newton (1755–1780), legendary soldier of the American Revolution	60,677	626 sq mi (1,621 km²)
Nodaway County	147	Maryville	1843	Andrew County, the Platte Purchase	Nodaway River, a 120-mile (190 km) long river in southwest Iowa and northwest Missouri	20,695	877 sq mi (2,271 km²)
Oregon County	149	Alton	1841	Ripley County	Oregon Territory	8,720	792 sq mi (2,051 km²)
Osage County	151	Linn	1841	Gasconade County	Osage River, a 360 miles (580 km) long tributary of the Missouri River in central Missouri; the name of the river is probably derived from a French corruption of "Washazhe" – the name of the Osage Native Americans	13,468	606 sq mi (1,570 km²)
Ozark County	153	Gainesville	1841	Taney County	Ozark Mountains – Ozark is the anglicized form of the French "aux arcs", an abbreviation of "Aux Arkansas", which means in the county of Arkansas	8,970	747 sq mi (1,935 km²)
Pemiscot County	155	Caruthersville	1851	New Madrid County	An American Indian word meaning "liquid mud"	14,613	493 sq mi (1,277 km²)
Perry County	157	Perryville	1821	Sainte Genevieve County	Oliver Hazard Perry (1785–1819), naval officer in the War of 1812 against Britain, earned the title "Hero of Lake Erie" for leading American forces in a decisive naval victory at the Battle of Lake Erie	18,950	475 sq mi (1,230 km²)
Pettis County	159	Sedalia	1833	Cooper and Saline counties	Spencer Darwin Pettis (1802–1831), U.S. Representative from Missouri	43,530	685 sq mi (1,774 km²)
Phelps County	161	Rolla	1857	Crawford County	John S. Phelps (1814–1886), a politician, soldier during the American Civil War, and twenty-third Governor of Missouri	45,284	673 sq mi (1,743 km²)
Pike County	163	Bowling Green	1818	St. Charles County	Zebulon Pike (1778–1813), American soldier and explorer for whom Pikes Peak in Colorado is also named	17,935	673 sq mi (1,743 km²)
Platte County	165	Platte City	1838	Part of the Platte Purchase	Platte River, a tributary of the Missouri River, which is in turn named for the French word "platte" meaning flat or shallow	111,940	420 sq mi (1,088 km²)
Polk County	167	Bolivar	1835	Greene County	James K. Polk (1795–1849), 11th President of the United States	32,780	637 sq mi (1,650 km²)
Pulaski County	169	Waynesville	1833	Crawford County	Kazimierz Pulaski (1745–1779), Polish soldier of fortune in the American Revolutionary War, he saved the life of George Washington and became a general in the Continental Army	53,812	547 sq mi (1,417 km²)
Putnam County	171	Unionville	1843	Adair and Sullivan counties	Israel Putnam (1718–1790), an American army general who fought with distinction at the Battle of Bunker Hill during the American Revolutionary War	4,638	518 sq mi (1,342 km²)
Ralls County	173	New London	1821	Pike County	Daniel Ralls, a Missouri State Representative	10,489	471 sq mi (1,220 km²)
Randolph County	175	Huntsville	1829	Chariton and Ralls counties	John Randolph of Roanoke (1773–1833), a leader in Congress from Virginia and spokesman for the "Old Republican"	24,109	482 sq mi (1,248 km²)
Ray County	177	Richmond	1820	Howard County	John Ray, Missouri State Representative	23,182	570 sq mi (1,476 km²)
Reynolds County	179	Centerville	1845	Shannon County	Thomas Reynolds (1796–1844), governor of Missouri from 1840 to 1844	5,950	811 sq mi (2,100 km²)
Ripley County	181	Doniphan	1831	Wayne County	Eleazer Wheelock Ripley (1782–1839), Brigadier General in the War of 1812	10,806	630 sq mi (1,632 km²)
Saint Charles County	183	Saint Charles	1812	One of the five original counties	St. Charles Borromeo (1538–1584), an Italian saint and cardinal of the Roman Catholic Church	416,659	561 sq mi (1,453 km²)
Saint Clair County	185	Osceola	1841	Rives (now Henry) County	Arthur St. Clair (1737–1818), an American soldier and Governor of the Northwest Territory	9,752	677 sq mi (1,753 km²)
Saint Francois County	187	Farmington	1821	Jefferson, Ste. Genevieve and Washington counties	St. Francis of Assisi (c. 1182–1226), a Catholic deacon and the founder of the Order of Friars Minor, more commonly known as the Franciscans	67,058	450 sq mi (1,165 km²)
Saint Louis County	189	Clayton	1812	One of the five original counties	King Louis IX (1214–1270), King of France from 1226 until his death	987,059	508 sq mi (1,316 km²)
Saint Louis City	510	St. Louis	1876	Created in 1876 when city residents voted to secede from St. Louis County	King Louis IX (1214–1270), King of France from 1226 until his death	281,754	61.9 sq mi (160 km²)
Sainte Genevieve County	186	Ste. Genevieve	1812	One of the five original counties	St. Genevieve (c. 420 – c. 510), the patron saint of Paris in Roman Catholic and Eastern Orthodox tradition	18,642	502 sq mi (1,300 km²)
Saline County	195	Marshall	1820	Cooper County	Local hot springs	23,049	756 sq mi (1,958 km²)
Schuyler County	197	Lancaster	1843	Adair County	Philip Schuyler (1733–1804), a general in the American Revolution and a United States Senator from New York	4,053	308 sq mi (798 km²)
Scotland County	199	Memphis	1841	Clark, Lewis, and Shelby counties	Scotland (country)	4,676	438 sq mi (1,134 km²)
Scott County	201	Benton	1822	New Madrid County	John Guier Scott (1819–1892), a U.S. Representative from Missouri	37,889	421 sq mi (1,090 km²)
Shannon County	203	Eminence	1837	Ripley County	George Shannon (1785–1836), member of the Lewis and Clark Expedition	7,238	1,004 sq mi (2,600 km²)
Shelby County	205	Shelbyville	1835	Marion County	Isaac Shelby (1750–1826), the first and fifth Governor of Kentucky	5,931	501 sq mi (1,298 km²)
Stoddard County	207	Bloomfield	1835	New Madrid County	Amos Stoddard (1762–1813), the only commandant of Upper Louisiana for the French Republic and the only commandant for the District of Louisiana for the United States in 1804 during the handover of the Louisiana Purchase	28,397	827 sq mi (2,142 km²)
Stone County	209	Galena	1851	Taney County	William Stone, first elected judge of Taney County	32,658	463 sq mi (1,199 km²)
Sullivan County	211	Milan	1843	Linn County	John Sullivan (1740–1795), American Revolutionary War general	5,797	651 sq mi (1,686 km²)
Taney County	213	Forsyth	1837	Greene County	Roger Brooke Taney (1777–1864), eleventh United States Attorney General and fifth Chief Justice of the United States	56,775	632 sq mi (1,637 km²)
Texas County	215	Houston	1843	Shannon and Wright counties	Republic of Texas	25,619	1,179 sq mi (3,054 km²)
Vernon County	217	Nevada	1851	Bates County	Miles Vernon, Missouri State Senator – the county was originally defined as having the same boundaries as Bates county, but was later declared unconstitutional and changed	19,710	834 sq mi (2,160 km²)
Warren County	219	Warrenton	1833	Montgomery County	Joseph Warren (1741–1775), Revolutionary War doctor and general	37,806	432 sq mi (1,119 km²)
Washington County	221	Potosi	1813	Sainte Genevieve County	George Washington (1732–1799), commander of the Continental Army in the American Revolutionary War and first President of the United States	23,534	760 sq mi (1,968 km²)
Wayne County	223	Greenville	1818	Cape Girardeau and Lawrence counties	Anthony Wayne (1745–1796), United States Army general and statesman	10,811	761 sq mi (1,971 km²)
Webster County	225	Marshfield	1855	Greene County	Daniel Webster (1782–1852), U.S. Secretary of State and Senator from Massachusetts	41,472	593 sq mi (1,536 km²)
Worth County	227	Grant City	1861	Gentry County	William J. Worth (1794–1849), a United States general during the Mexican–American War	1,907	266 sq mi (689 km²)
Wright County	229	Hartville	1841	Pulaski County	Silas Wright (1795–1847), an American Democratic politician and Governor of New York	19,403	682 sq mi (1,766 km²)

Former county names

County^[3]	Etymology^[3]^[10]	Changed to^[3]
Allen County	Unknown	Atchison County in 1845
Ashley County	William Henry Ashley (1778–1838), early settler	Texas County in 1845 upon organization
Decatur County	Stephen Decatur (1779–1820), American naval officer^[13]	Ozark County in 1845
Highland County	Unknown	Sullivan County in 1845 upon organization
Kinderhook County	Kinderhook, New York, birthplace of Martin Van Buren	Camden County in 1843
Lillard County	James Lillard of Tennessee, who served in the first state legislature of Missouri	Lafayette County in 1825
Niangua County	Niangua River, a tributary of the Osage River – "niangua" comes from the Native American word nehemgar, which means "a river of numerous springs or sources"^[14]	Dallas County in 1844 because of the difficulty in pronouncing and spelling Niangua
Seneca County	Seneca Nation, a group of Native Americans from New York	McDonald County in 1847 upon organization
Van Buren County	Martin Van Buren (1782–1862), eighth President of the United States and also Vice President under Andrew Jackson	Cass County in 1849 in honor of Van Buren's opponent in the presidential election of 1848

References

^ "Timeline of Missouri History: 1673–1799". Missouri State Government Web. Retrieved October 10, 2009.
^ "County Government Links". Missouri State Government Web. Archived from the original on May 23, 2009. Retrieved October 10, 2009.
^ ^a ^b ^c ^d ^e ^f "What are the Origins of Missouri Counties?". Missouri State Government Web. Retrieved September 17, 2009.
^ "About St. Louis: Government". City of St. Louis. Archived from the original on June 7, 2011. Retrieved October 12, 2009.
^ U.S. Census Bureau Archived July 2, 2013, at the Wayback Machine , ("Missouri County Selection Map")
^ "2020 Population and Housing State Data". U.S. Census Bureau. Retrieved August 12, 2021.
^ ^a ^b "EPA County FIPS Code Listing". US Environmental Protection Agency. Archived from the original on March 21, 2014. Retrieved September 27, 2009.
^ ^a ^b ^c "NACo – Find a county". National Association of Counties. Archived from the original on August 28, 2009. Retrieved September 17, 2009.
^ Beatty, Michael (2001). County Name Origins of the United States. McFarland Press. ISBN 0-7864-1025-6.
^ ^a ^b Coulet du Gard, René; Coulet Western, Dominique (1981). The Handbook of American Counties, Parishes and Independent Cities. Editions des Deux Mondes. ISBN 0-939586-00-2.
^ "U.S. Census 2023 population estimates". United States Census Bureau. Retrieved April 20, 2024.
^ Howard Louis Conard (1901). Encyclopedia of the history of Missouri. New York, Louisville [etc.] The Southern history company, Haldeman, Conard & co., proprietors. p. 68.
^ Stevens, Walter B. (1921). Centennial history of Missouri (The Center State) One Hundred Years in the Union 1820–1921. Chicago: Clarke Pub. Co. p. 72.
^ Stevens, Walter B. (1921). Centennial history of Missouri (The Center State) One Hundred Years in the Union 1820–1921. Chicago: Clarke Pub. Co. p. 73.