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	█ Average max. and min. temperatures in °F
	█ Precipitation totals in inches
	Source: The Weather Channel

Vienna, Illinois
Climate chart (explanation)
	█ Average max. and min. temperatures in °F
	█ Precipitation totals in inches
	Source: The Weather Channel
Metric conversion
	█ Average max. and min. temperatures in °C
	█ Precipitation totals in mm

Johnson County
Johnson County
County
	Johnson County Courthouse in Vienna
	Location within the U.S. state of Illinois
	Illinois's location within the U.S.
	Coordinates: 37°28′N 88°52′W / 37.46°N 88.87°W
Country	United States
State	Illinois
Founded	1812
Named for	Richard Mentor Johnson
Seat	Vienna
Largest city	Vienna
Area
• Total	349 sq mi (900 km2)
• Land	344 sq mi (890 km2)
• Water	4.9 sq mi (13 km2) 1.4%
Population (2020)
• Total	13,308
• Estimate (2023)	13,326
• Density	38/sq mi (15/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	12th

Johnson County is a county in the U.S. state of Illinois. According to the 2020 census, it has a population of 13,308.^[1] Its county seat is Vienna.^[2] It is located in the southern portion of Illinois known locally as "Little Egypt".

History

Johnson County was organized in 1812 out of Randolph County. It was named for Richard Mentor Johnson, who was then a U.S. Congressman from Kentucky.^[3] In 1813, Johnson commanded a Kentucky regiment at the Battle of the Thames, after which he claimed to have killed Tecumseh in hand-to-hand combat. Johnson went on to become Vice President of the United States.

Johnson County at the time of its creation to 1816
Johnson County between 1816 and 1818
Johnson County between 1818 and 1843
Johnson County in 1843, when it was reduced to its present size

Geography

According to the U.S. Census Bureau, the county has a total area of 349 square miles (900 km²), of which 344 square miles (890 km²) is land and 4.9 square miles (13 km²) (1.4%) is water.^[4]

Climate and weather

In recent years, average temperatures in the county seat of Vienna have ranged from a low of 25 °F (−4 °C) in January to a high of 90 °F (32 °C) in July, although a record low of −20 °F (−29 °C) was recorded in January 1977 and a record high of 103 °F (39 °C) was recorded in August 2007. Average monthly precipitation ranged from 3.16 inches (80 mm) in October to 5.16 inches (131 mm) in May.^[5]

Major highways

Demographics

Historical population
Census	Pop.	Note	%±
1820	843		—
1830	1,596		89.3%
1840	3,626		127.2%
1850	4,114		13.5%
1860	9,342		127.1%
1870	11,248		20.4%
1880	13,078		16.3%
1890	15,013		14.8%
1900	15,667		4.4%
1910	14,331		−8.5%
1920	12,022		−16.1%
1930	10,203		−15.1%
1940	10,727		5.1%
1950	8,729		−18.6%
1960	6,928		−20.6%
1970	7,550		9.0%
1980	9,624		27.5%
1990	11,347		17.9%
2000	12,878		13.5%
2010	12,582		−2.3%
2020	13,308		5.8%
2023 (est.)	13,326	^[6]	0.1%
U.S. Decennial Census^[7] 1790-1960^[8] 1900-1990^[9] 1990-2000^[10] 2010^[11]

2010

Whereas, according to the 2010 U.S. Census Bureau:

89.0% White
8.0% Black
0.2% Native American
0.2% Asian
0.0% Native Hawaiian or Pacific Islander
1.0% Two or more races
1.6% Other races
3.0% Hispanic or Latino (of any race)

2010

As of the 2010 United States census, there were 12,582 people, 4,584 households, and 3,270 families residing in the county.^[13] The population density was 36.6 inhabitants per square mile (14.1/km²). There were 5,598 housing units at an average density of 16.3 per square mile (6.3/km²).^[4] The racial makeup of the county was 89.0% white, 8.0% black or African American, 0.2% Asian, 0.2% American Indian, 1.6% from other races, and 1.0% from two or more races. Those of Hispanic or Latino origin made up 3.0% of the population.^[13] In terms of ancestry, 17.6% were German, 11.5% were Irish, 10.9% were English, and 6.5% were American.^[14]

Of the 4,584 households, 28.8% had children under the age of 18 living with them, 59.2% were married couples living together, 8.3% had a female householder with no husband present, 28.7% were non-families, and 25.3% of all households were made up of individuals. The average household size was 2.41 and the average family size was 2.85. The median age was 42.2 years.^[13]

The median income for a household in the county was $41,619 and the median income for a family was $47,423. Males had a median income of $48,047 versus $30,904 for females. The per capita income for the county was $16,402, the lowest of all 102 counties in Illinois and 57th in the U.S. About 11.1% of families and 13.6% of the population were below the poverty line, including 19.0% of those under age 18 and 10.7% of those age 65 or over.^[15]

Communities

Cities

Marion (mostly in Williamson County)
Vienna

Villages

Unincorporated communities

Politics

In its early days Johnson County, being strongly Southern in its culture, was fiercely Democratic. In fact, in the 1860 presidential election, the county gave Illinois native and Northern Democrat Stephen A. Douglas a higher proportion of its votes than any other county in the United States.^{[citation needed]}

However, during the Civil War, under the influence of Congressman John Logan, this region of dubious initial loyalty was to provide a number of Union soldiers rivaled on a per capita basis only by a few fiercely Unionist counties in Appalachia.^[16]^[17] This level of Union service has meant that despite its historic hostility towards Yankee culture, Johnson County has been powerfully Republican ever since the Civil War.^{[citation needed]} Douglas in 1860 remains the last Democrat to win a majority of the county's vote: the solitary Democratic victory since was when Bill Clinton won a plurality against Republican George H. W. Bush and independent Ross Perot.

United States presidential election results for Johnson County, Illinois^[18]
Year	Republican		Democratic		Third party(ies)
Year	No.	%	No.	%	No.	%
2024	4,798	78.62%	1,241	20.33%	64	1.05%
2020	5,059	78.43%	1,281	19.86%	110	1.71%
2016	4,649	76.35%	1,142	18.76%	298	4.89%
2012	3,963	69.60%	1,572	27.61%	159	2.79%
2008	3,912	66.15%	1,871	31.64%	131	2.22%
2004	3,997	68.15%	1,813	30.91%	55	0.94%
2000	3,285	61.26%	1,928	35.96%	149	2.78%
1996	2,241	45.46%	2,009	40.75%	680	13.79%
1992	2,124	39.40%	2,299	42.65%	968	17.96%
1988	2,797	59.61%	1,872	39.90%	23	0.49%
1984	3,424	67.36%	1,647	32.40%	12	0.24%
1980	3,201	65.49%	1,586	32.45%	101	2.07%
1976	2,417	52.23%	2,182	47.15%	29	0.63%
1972	2,826	68.54%	1,293	31.36%	4	0.10%
1968	2,406	60.53%	1,143	28.75%	426	10.72%
1964	2,217	55.61%	1,770	44.39%	0	0.00%
1960	2,778	66.19%	1,413	33.67%	6	0.14%
1956	2,973	65.72%	1,549	34.24%	2	0.04%
1952	3,327	67.25%	1,614	32.63%	6	0.12%
1948	2,778	64.47%	1,510	35.04%	21	0.49%
1944	3,298	68.24%	1,522	31.49%	13	0.27%
1940	3,827	62.80%	2,254	36.99%	13	0.21%
1936	3,537	58.46%	2,497	41.27%	16	0.26%
1932	2,424	49.87%	2,387	49.11%	50	1.03%
1928	2,892	70.69%	1,163	28.43%	36	0.88%
1924	2,468	60.59%	1,408	34.57%	197	4.84%
1920	2,972	70.91%	1,137	27.13%	82	1.96%
1916	3,273	62.58%	1,822	34.84%	135	2.58%
1912	1,025	35.07%	952	32.57%	946	32.36%
1908	1,913	62.27%	1,055	34.34%	104	3.39%
1904	2,164	65.16%	980	29.51%	177	5.33%
1900	1,940	59.02%	1,271	38.67%	76	2.31%
1896	2,027	58.18%	1,429	41.02%	28	0.80%
1892	1,716	55.41%	854	27.58%	527	17.02%