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2018 United States House of Representatives election in South Dakota, At-large district
	Johnson: 40–50% 50–60% 60–70% 70–80% 80–90% >90%; Bjorkman: 40–50% 50–60% 60–70% 70–80% 80–90%; Tie: 40–50%
U.S. Representative before election; Kristi Noem; Republican	Elected U.S. Representative ; Dusty Johnson; Republican

The 2018 United States House of Representatives election in South Dakota was held on November 6, to elect the U.S. representative for South Dakota's at-large congressional district. The election coincided with other statewide, legislative, and local elections.

Incumbent Republican U.S. Representative Kristi Noem did not run for a fifth term and instead ran successfully for Governor of South Dakota.^[1] This is the first open seat election since 2004 and the first time a male candidate was elected since 2002. This was the last U.S. House election in South Dakota until 2024 that a Democrat appeared on the November ballot.

Republican primary

Candidates

Declared

Dusty Johnson, former chairman of the South Dakota Public Utilities Commission and former chief of staff to Governor Dennis Daugaard^[2]
Shantel Krebs, Secretary of State of South Dakota^[2]
Neal Tapio, state senator, businessman and former Trump campaign director for South Dakota.^[3]

Declined

Eric Terrell^[4]^[5]
Kristi Noem, incumbent U.S. Representative (running for governor)^[1]

Polling

Poll source	Date(s) administered	Sample size	Margin of error	Dusty Johnson	Shantel Krebs	Neal Tapio	Undecided
Mason-Dixon^[6]	May 21–23, 2018	625	± 4.5%	41%	23%	13%	23%

Primary results

Republican primary results
Party		Candidate	Votes	%
	Republican	Dusty Johnson	47,032	46.8
	Republican	Shantel Krebs	29,442	29.3
	Republican	Neal Tapio	23,980	24.0
Total votes			100,454	100

Democratic primary

Candidates

Declared

Tim Bjorkman, former circuit court judge^[7]

Failed to file

Chris Martian, former IT professional^[8]

Declined

Shawn Bordeaux, state representative^[9]
Troy Heinert, state senator^[9]
J. R. LaPlante, former South Dakota Secretary of Tribal Relations and State House candidate in 2016^[9]
Stephanie Herseth Sandlin, former U.S. Representative^[10]^[11]
Mike Huether, Mayor of Sioux Falls (switched to Independent)^[12]
Brendan Johnson, former United States Attorney for the District of South Dakota^[10]
Billie Sutton, Minority Leader of the South Dakota Senate (running for governor)^[13]^[14]

Libertarian nomination

Candidates

Declared

George Hendrickson, former police officer^[15]^[16]

Independents

Candidates

Declined

Mike Huether, Mayor of Sioux Falls^[12]^[17]^[18]

General election

Predictions


Source	Ranking	As of
The Cook Political Report^[19]	Solid R	June 1, 2018
The Rothenberg Political Report^[20]	Solid R	June 1, 2018
Sabato's Crystal Ball^[21]	Safe R	June 6, 2018

Polling

Poll source	Date(s) administered	Sample size	Margin of error	Dusty Johnson (R)	Tim Bjorkman (D)	Other	Undecided
Change Research (D)^[22]	November 2–4, 2018	851	–	51%	41%	5%^[23]	–
Emerson College^[24]	November 1–4, 2018	514	± 4.5%	54%	38%	–	5%
Mason-Dixon^[25]	October 18–22, 2018	500	± 4.5%	54%	31%	3%^[26]	12%
Public Opinion Strategies (R-Johnson)^[27]	August 1–3 & 5, 2018	400	± 4.9%	54%	33%	–	10%
Public Policy Polling (D-Bjorkman)^[28]	July 19–20, 2018	641	± 3.9%	43%	33%	–	14%

Results

South Dakota's at-large congressional district, 2018^[29]
Party		Candidate	Votes	%	±%
	Republican	Dusty Johnson	202,446	60.35%	−3.75%
	Democratic	Tim Bjorkman	120,816	36.01%	+0.11%
	Independent	Ron Wieczorek	7,313	2.18%	N/A
	Libertarian	George D. Hendrickson	4,896	1.46%	N/A
Total votes			335,471	100.0%	N/A
	Republican hold