† Citizen voting-age population estimated for prior cycles; 2004 predates the ACS and is extrapolated. Source: ACS 5-year, table B05003.
——
D+60R+60
2 counties by 2024 margin · County returns · MIT Election Lab
People and households
Who lives here
Exact values for this place, its state, and the United States.
Race · ethnicity · ancestry
Communities and origins
GroupMason City, IAIowaUnited States
German34.5%30.5%12.5%
Norwegian14.7%4.1%—
Irish10.3%12.8%9.4%
English7.3%10.2%9.5%
American4.5%4.6%5.3%
Danish1.9%——
Dutch1.8%2.7%—
French1.7%—1.6%
Mexican4.1%5.0%11.3%
Puerto Rican0.4%0.3%1.8%
Guatemalan0.2%0.4%0.5%
Bolivian0.2%——
African American†1.5%2.6%9.9%
Chinese0.3%0.3%1.3%
Asian Indian0.2%0.5%1.4%
Vietnamese0.2%0.3%0.6%
Laotian0.2%0.2%—
Hispanic or Latino counts residents of any race; the race groups count only their non-Hispanic residents, so the groups are mutually exclusive and sum to 100%. Expand a row to see ancestries reported within that group.
Age and life stage
Measure
Mason City, IA
Iowa
United States
Median age
44
38.8
39.1
Age 18–24
7.0%
10.0%
9.2%
Age 65 and older
23.5%
18.1%
17.2%
Household economy
Measure
Mason City, IA
Iowa
United States
Median household income
$69,633
$75,059
$84,427
Poverty rate
10.2%
11.1%
12.5%
Bachelor's degree or higher (25+)
23.3%
31.8%
35.6%
Languages at home
Measure
Mason City, IA
Iowa
United States
Speaks a non-English language at home
3.6%
9.2%
22.3%
Spanish
1.8%
4.7%
13.6%
Religious landscape
Measure
Mason City, IA
Iowa
United States
Catholic
12.1%
14.7%
18.6%
Evangelical Protestant
15.4%
10.9%
16.5%
Unclaimed / not counted
43.0%
55.2%
51.5%
Mainline Protestant
27.0%
15.8%
5.2%
American Community Survey 2024 5-year (CVAP, income, age, poverty, education, language, race, ancestry) · presidential returns from MIT Election Lab through 2024 · 2020 U.S. Religion Census (ASARB) — congregational adherents; unclaimed is the residual not counted by congregations.
Mason City, IA
presidential history
Presidential margin, 1892–2024
Democratic minus Republican, by election
Presidential margin over time
Year
Margin (D minus R)
1892
−28.8%
1896
−40.1%
1900
−46.5%
1904
−58.5%
1908
−37.2%
1912
+6.3%
1916
−26.8%
1920
−59.3%
1924
−48.9%
1928
−33.3%
1932
+11.6%
1936
+13.6%
1940
+6.5%
1944
+6.0%
1948
+11.0%
1952
−22.6%
1956
−12.3%
1960
−11.5%
1964
+24.9%
1968
−10.8%
1972
−11.1%
1976
+3.8%
1980
−8.7%
1984
+2.3%
1988
+16.9%
1992
+13.2%
1996
+21.9%
2000
+12.8%
2004
+10.1%
2008
+21.1%
2012
+13.6%
2016
−9.8%
2020
−9.4%
2024
−14.2%
DemocraticRepublican
34 presidential elections
Third column names the leading third-party or independent finisher. Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024). Swing · margin change from the prior cycle. vs U.S. · margin relative to the national result that year.
Year
Won
Democratic
Republican
Other
Margin
Swing
vs U.S.
Total
R
42.0%Harris11,463
56.2%Trump15,342
1.8%
R+14.2
R+4.8
R+12.7
27,307
R
44.4%Biden12,537
53.8%Trump15,180
1.8%
R+9.4
D+0.4
R+13.8
28,219
R
41.5%Clinton11,392
51.3%Trump14,074
7.2%
R+9.8
R+23.3
R+11.9
27,442
D
56.0%Obama15,666
42.4%Romney11,872
1.6%
D+13.6
R+7.5
D+9.7
27,996
D
59.8%Obama16,972
38.7%McCain10,987
1.5%
D+21.1
D+10.9
D+13.8
28,397
D
54.7%Kerry15,658
44.5%Bush12,755
0.8%
D+10.1
R+2.6
D+12.6
28,639
D
55.0%Gore14,393
42.3%Bush11,056
2.7%
D+12.8
R+9.1
D+12.2
26,166
D
56.4%Clinton14,236
34.5%Dole8,711
9.1%
D+21.9
D+8.7
D+13.4
25,239
D
46.7%Clinton13,424
33.5%Bush9,632
19.8%
D+13.2
R+3.7
D+7.6
28,741
D
58.1%Dukakis15,297
41.2%Bush10,846
0.8%
D+16.9
D+14.6
D+24.6
26,347
D
50.8%Mondale13,833
48.5%Reagan13,199
0.7%
D+2.3
D+11.0
D+20.5
27,216
R
40.8%Carter11,084
49.5%Reagan13,436
9.6%
R+8.7
R+12.5
D+1.1
27,138
D
51.0%Carter13,588
47.2%Ford12,568
1.7%
D+3.8
D+14.9
D+1.8
26,621
R
43.7%McGovern11,494
54.8%Nixon14,420
1.6%
R+11.1
R+0.3
D+12.0
26,329
R
41.9%Humphrey10,369
52.7%Nixon13,044
5.3%
R+10.8
R+35.7
R+10.1
24,730
D
62.4%Johnson16,092
37.5%Goldwater9,661
0.2%
D+24.9
D+36.5
D+2.3
25,794
R
44.2%Kennedy12,347
55.7%Nixon15,570
0.1%
R+11.5
D+0.8
R+11.7
27,937
R
43.8%Stevenson11,827
56.1%Eisenhower15,149
0.1%
R+12.3
D+10.3
D+3.1
27,008
R
38.6%Stevenson10,429
61.2%Eisenhower16,522
0.2%
R+22.6
R+33.5
R+11.8
27,012
D
54.5%Truman12,167
43.5%Dewey9,718
1.9%
D+11.0
D+5.0
D+6.5
22,319
D
52.8%Roosevelt11,717
46.9%Dewey10,397
0.3%
D+6.0
R+0.5
R+1.5
22,184
D
53.1%Roosevelt13,846
46.7%Willkie12,162
0.2%
D+6.5
R+7.2
R+3.5
26,067
D
55.6%Roosevelt12,670
42.0%Landon9,563
2.4%
D+13.6
D+2.1
R+10.6
22,778
D
55.3%Roosevelt11,392
43.7%Hoover9,007
1.0%
D+11.6
D+44.8
R+6.2
20,613
R
32.9%Smith6,218
66.2%Hoover12,503
0.9%
R+33.3
D+15.6
R+15.8
18,888
R
8.1%Davis1,525
56.9%Coolidge10,750
35.0%
R+48.9
D+10.5
R+23.7
18,882
R
18.8%Cox2,818
78.2%Harding11,694
3.0%
R+59.3
R+32.5
R+33.1
14,960
R
35.4%Wilson2,855
62.1%Hughes5,019
2.5%
R+26.8
R+33.1
R+29.9
8,076
O
29.8%Wilson2,144
23.5%Taft1,688
46.7%
Roosevelt +16.8
D+43.6
R+13.2
7,184
R
29.9%Bryan1,969
67.1%Taft4,423
3.1%
R+37.2
D+21.3
R+27.7
6,596
R
18.5%Parker1,143
77.0%Roosevelt4,767
4.6%
R+58.5
R+12.0
R+38.9
6,193
R
25.5%Bryan1,795
72.0%McKinley5,075
2.5%
R+46.5
R+6.5
R+39.0
7,049
R
29.0%Bryan1,992
69.1%McKinley4,744
1.9%
R+40.1
R+11.3
R+34.0
6,868
R
33.2%Cleveland1,823
61.9%Harrison3,406
4.9%
R+28.8
—
R+30.4
5,499
Congressional elections · 2 Senate races
U.S. Senate
Source · MIT Election Lab (MEDSL), Senate. CC-BY 4.0.
Year
Won
Democratic
Republican
Total
2022
R
43.8%8,827
56.0%11,291
20,146
2020
R
47.8%13,337
49.4%13,764
27,886
voter registration
Registered voters
By party of registration, over time
Party registration · 2024R+7.6
vs
Presidential vote · 2024R+14.2
Registration leans Republican; the presidential vote runs 6.6 points more Democratic.
DemocraticRepublicanUnaffiliatedOther parties
Voter registration in Mason City, IA
Year
Total registered
Democratic
Republican
Unaffiliated
Other
2008
38,205
12,816
10,034
15,348
7
2010
37,896
12,158
10,213
15,509
16
2012
38,571
12,052
10,466
16,033
20
2014
37,963
11,464
10,295
16,159
45
2016
37,817
11,127
10,866
15,736
88
2018
37,250
10,601
10,482
16,021
146
2020
37,451
11,340
11,170
14,707
234
2022
37,097
10,623
11,746
14,490
238
2024
37,070
9,836
12,657
14,273
304
domestic migration
Who moves in and out
Net domestic migration over time
+193 net domestic migration · 2025
20112025
Net −1,873 over 2011–2025 · gain loss
Domestic migration in Mason City, IA in Mason City, IA: net domestic migration by year
Year
Net domestic migration
2011
−170
2012
−338
2013
−180
2014
−263
2015
−243
2016
+154
2017
−58
2018
−366
2019
−193
2021
−148
2022
−278
2023
+45
2024
−28
2025
+193
Mason City anchors a trade-area economy built on manufacturing and agriculture, producing a competitive mix of working-class voters that has swung presidential margins by double digits across recent cycles.
Across the recorded series it reached a Democratic high of 24.9 points in 1964 and a Republican high of 59.3 points in 1920. Between 2020 and 2024 the metro moved 4.8 points toward the Republican candidate; the 2024 margin was 14.2 points.
A population of 49,982, a 89% non-Hispanic-white share, and a median household income of $69,633 describe the metro. The metro's voting pattern over the last decade is most similar to that of Albert Lea, MN and Rice Lake, WI.
Akashic
Political twins — metros
The metros whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Mason City, IA, Iowa. Akashic. https://akashic.app/cbsa/32380/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
Embed this page
A live widget for your site — no API key, attribution built in, CC BY 4.0. All widgets & sizes →
In 2024, Mason City, IA, Iowa voted Republican by 14.2 points (R+14.2), carried by the Republican candidate. Out of 27,307 votes cast, 11,463 went Democratic and 15,342 went Republican.
When did Mason City, IA, Iowa last vote Democratic?
The most recent presidential election in which Mason City, IA, Iowa voted Democratic was 2012.
How many people live in Mason City, IA, Iowa?
Mason City, IA, Iowa has a population of 49,982 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Mason City, IA, Iowa?
Median household income in Mason City, IA, Iowa is $69,633 — below the national median of $80,734. The Iowa state median is $75,059.
What is the political history of Mason City, IA, Iowa?
Akashic tracks 34 presidential elections in Mason City, IA, Iowa from 1892 to 2024. Of those, 15 went Democratic and 18 went Republican.
