Missouri's 3rd Senate district

Missouri's 3rd State Senate district
Senator	Mike Henderson R–Desloge
Demographics	91% White 2% Black 2% Hispanic 4% Multiracial
Population (2023)	178,774[1]

Missouri's 3rd Senatorial District is one of 34 districts in the Missouri Senate. The district has been represented by Republican Mike Henderson since 2025.^[2][3]

Geography

The district includes southwestern portions of the St. Louis metropolitan area and includes Crawford, St. Francois, Ste. Genevieve, Washington, and southern Jefferson counties.^[2][4] Major municipalities in the district include Bloomsdale, Bonne Terre, Cuba, De Soto, Farmington, and Park Hills. The district also includes a portion of Mark Twain National Forest.

Election results (1996–2024)

1996

Missouri's 3rd Senatorial District election (1996)^[5]

Party		Candidate	Votes	%
	Democratic	John E. Scott	36,939	65.42
	Republican	Leonard F. Arons	17,970	31.83
	Constitution	Ron Levy	1,555	2.75
Total votes			56,464	100.00

2000

Missouri's 3rd Senatorial District election (2000)^[6]

Party		Candidate	Votes	%
	Democratic	John E. Scott (incumbent)	36,728	64.02
	Republican	Leonard F. Arons	17,354	30.25
	Green	Mary A. Auer	3,287	5.73
Total votes			57,369	100.00
	Democratic hold

2001

Missouri's 3rd Senatorial District special election (2001)^[7]

Party		Candidate	Votes	%
	Democratic	Harry Kennedy	7,707	68.04
	Republican	Matt Hoffman	3,283	28.98
	Green	Robert H. McFall	337	2.98
Total votes			11,327	100.00
	Democratic hold

2004

Missouri's 3rd Senatorial District election (2004)^[8]

Party		Candidate	Votes	%
	Republican	Kevin Engler	34,767	51.04
	Democratic	Dan Ward	33,348	48.96
Total votes			68,115	100.00
	Republican gain from Democratic

2008

Missouri's 3rd Senatorial District election (2008)^[9]

Party		Candidate	Votes	%
	Republican	Kevin Engler (incumbent)	42,551	58.72
	Democratic	Dennis Riche	29,917	41.28
Total votes			72,468	100.00
	Republican hold

2012

Missouri's 3rd Senatorial District election (2012)^[10]

Party		Candidate	Votes	%
	Republican	Gary Romine	35,384	53.84
	Democratic	Joseph Fallert, Jr	30,335	46.16
Total votes			65,719	100.00
	Republican hold

2016

Missouri's 3rd Senatorial District election (2016)^[11]

Party		Candidate	Votes	%
	Republican	Gary Romine (incumbent)	54,414	81.25
	Green	Edward R. Weissler	12,555	18.75
Total votes			66,969	100.00
	Republican hold

2020

Missouri's 3rd Senatorial District election (2020)^[12][13]

Party		Candidate	Votes	%
	Republican	Elaine F. Gannon	65,686	100.00
Total votes			65,686	100.00
	Republican hold

2024

Missouri's 3rd Senatorial District election (2024)^[14][3]

Party		Candidate	Votes	%
	Republican	Mike Henderson	60,548	75.86
	Democratic	Doug Halbert	19,273	24.15
Total votes			79,821	100.00
	Republican hold

Statewide election results

Year	Office	Results
2008	President	McCain 49.4 – 48.4%
2012	President	Romney 59.0 – 41.0%
2016	President	Trump 71.0 – 24.8%
	Senate	Blunt 53.7 – 40.8%
	Governor	Greitens 56.6 – 38.9%
2018	Senate	Hawley 59.6 – 36.5%
2020	President	Trump 74.1 – 24.5%
	Governor	Parson 70.4 – 27.0%

Source: ^[15]

References

1. U.S. Census Bureau (2023). American Community Survey 5-year estimates. Retrieved from Census Reporter Profile page for Missouri State Senate District 3, MO
2. "Senator Mike Henderson". Missouri Senate.
3. "Senator-elect Henderson wants drunk drivers to pay child support if parent is killed". Missourinet. December 7, 2024.
4. "The district includes the southern half of Jefferson County, as well as all of Ste. Genevieve, St. Francois, Washington and Crawford counties". Leader Publications. December 14, 2023.
5. 1996 General Election Results
6. 2000 General Election Results
7. 2000 General Election Results
8. 2004 General Election Results
9. 2008 General Election Results
10. 2012 General Election Results
11. 2016 General Election Results
12. 2020 General Election Results
13. "2020 Missouri State Senate Election Results". Des Moines Register.
14. 2024 General Election Results
15. "DRA 2020". Daves Redistricting. Retrieved February 27, 2025.