Jefferson County, Iowa

2024 results by precinct

12 precincts · 8,346 votes cast

Trump · R+7

Harris +50

Trump +50

Real precinct boundaries. Hover for vote totals.

38 presidential elections

Year	Won	Margin	Democratic	Republican	Total
2024	R	−6.8%	3,788	4,353	8,346
2020	R	−1.4%	4,319	4,443	8,959
2016	R	−0.5%	3,710	3,748	8,285
2012	D	+16.0%	4,798	3,436	8,530
2008	D	+20.2%	5,070	3,324	8,631
2004	D	+10.2%	4,490	3,648	8,281
2000	R	−5.1%	2,863	3,248	7,548
1996	D	+0.8%	2,597	2,541	7,397
1992	D	+0.3%	2,562	2,541	8,341
1988	R	−0.3%	3,594	3,614	7,296
1984	R	−22.9%	2,961	4,727	7,725
1980	R	−20.9%	2,577	4,099	7,299
1976	R	−5.1%	3,377	3,746	7,244
1972	R	−31.7%	2,362	4,628	7,139
1968	R	−24.8%	2,411	4,130	6,939
1964	D	+20.0%	4,135	2,755	6,916
1960	R	−28.0%	2,780	4,942	7,722
1956	R	−25.6%	2,845	4,807	7,659
1952	R	−38.8%	2,470	5,630	8,149
1948	R	−12.3%	3,033	3,906	7,088
1944	R	−19.2%	2,926	4,335	7,344
1940	R	−17.9%	3,402	4,891	8,336
1936	R	−4.4%	3,690	4,037	7,941
1932	D	+15.5%	4,056	2,955	7,110
1928	R	−38.7%	2,159	4,919	7,124
1924	R	−42.7%	1,249	4,062	6,593
1920	R	−50.9%	1,450	4,558	6,108
1916	R	−10.9%	1,734	2,167	3,968
1912	R	−1.8%	1,311	1,378	3,662
1908	R	−21.4%	1,439	2,271	3,896
1904	R	−30.9%	1,172	2,330	3,744
1900	R	−20.6%	1,612	2,482	4,226
1896	R	−16.3%	1,772	2,478	4,329
1892	R	−15.3%	1,545	2,140	3,889
1888	—	No data	—	—	—
1884	—	No data	—	—	—
1880	—	No data	—	—	—
1876	—	No data	—	—	—

Demographics

Race, ethnicity, and ancestry

Click any group to see the ancestries typically reported within it.

American

100.0%

Polish

0.6%

African American

2.0%

Multiple ancestry combinations reported; no single grouping above 1%.

American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.

Source · American Community Survey 5-year estimates, 2024 release. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.

Age distribution by sex

Median age: 43.7 in this county, 39.1 nationally

Male

Age

Female

0.8%

85+

1.4%

3.3%

75–84

4.1%

8.9%

65–74

8.2%

5.8%

55–64

6.6%

5.0%

45–54

4.5%

5.4%

35–44

5.4%

9.0%

25–34

6.3%

4.3%

18–24

3.7%

6.3%

5–17

6.3%

2.5%

2.1%

Source · American Community Survey 5-year estimates, 2024 release.

Median household income

2024 inflation-adjusted dollars

$61,620

Jefferson County ranks near the middle of US counties.

Jefferson County$61,620

Iowa$75,059

United States$80,734

Source · American Community Survey 5-year estimates, 2024 release.

Poverty rate

All persons below federal poverty line

15.2%

Children face moderate poverty.

Children under 1818.0%

Working age (18–64)100.0%

Seniors (65+)18.0%

Source · American Community Survey 5-year estimates, 2024 release.

Language at home

Population aged 5 and older

0.0%

speak English only

Source · ACS 5-year estimates, 2024.

Religious adherents

Adherents per capita by tradition

Mainline Protestant

8.7%

Catholic & Orthodox

6.4%

Methodist

4.9%

Other Christian

4.4%

Non-Christian

3.9%

Baptist

0.9%

Pentecostal & Holiness

0.7%

Source · 2020 US Religion Census. Remaining 70.1% of residents not counted as adherents by any reporting body.

Jefferson County, home to Fairfield and the Maharishi University of Management, blends a small but visible meditation-community enclave with a broader rural population that has shifted Republican by double digits over the past two presidential cycles.

The Democratic margin in Jefferson County has rarely exceeded twenty points in modern history; the Republican margin has rarely exceeded fifty-one points. 2024 delivered the county to the Republican candidate by seven points.

Jefferson County's demographics resemble the country more than they resemble most counties. A 84% non-Hispanic-white share, a 15% poverty rate, and a median household income of $61,620 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Mahnomen County and Winneshiek County.

Most similar counties

Jefferson County votes the way the country votes.