akashic
1876–2024
State Senate District 31·Idaho

Idaho 31st State Senate District has voted Republican in nineteen straight presidential cycles.

One of Idaho's most reliably Republican legislative districts

1876 — 2024·38 elections
ID
Latest
R+69
in 2024
Archetype
Republican loyalist
since the recent cycles
Population
56,184
2024 ACS

Idaho 31st State Senate District, Idaho: Republican loyalist district. In 2024, voted R+69%. Democratic peak: D+78 in 1896.

Key facts

2024 presidential margin
R+69MIT Election Lab
Political archetype
Republican loyalistAkashic typology
Population
56,1842024 5-year
Median household income
$77,8182024 5-year
White (non-Hispanic)
87.4%2024 5-year
Black
0.1%2024 5-year
Hispanic / Latino
10.6%2024 5-year
Peak Democratic margin
D+78 in 1896MIT Election Lab
Peak Republican margin
R+70 in 2004MIT Election Lab
2024 results by constituent county
4 counties · 0 D · 4 R
R+60
D+60
One cell per constituent county. Ordered by 2024 D-vs-R margin (bluest first). Hover for county-level numbers.
38 presidential elections
Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024).
YearWonMarginDemocraticRepublicanTotal
R
−69.0%
3,93223,11727,823
R
−68.5%
3,73121,49925,935
R
−61.9%
2,40315,73721,558
R
−69.0%
3,13818,06221,616
R
−60.8%
3,83016,47920,796
R
−69.5%
2,78516,04519,079
R
−67.1%
2,52113,88916,943
R
−41.7%
3,67210,56516,536
R
−28.0%
2,9717,53716,310
R
−50.2%
3,66511,35215,308
R
−67.4%
2,47112,93615,535
R
−63.6%
2,63913,04916,364
R
−27.9%
4,5178,19713,196
R
−44.1%
2,1237,75312,756
R
−37.9%
2,5496,96911,652
R
−9.9%
5,2836,44111,724
R
−6.3%
5,7196,49112,210
R
−23.7%
4,5467,37111,917
R
−34.8%
3,9478,16012,114
D
+5.1%
5,0594,5659,747
D
+9.0%
5,4814,57710,073
D
+12.2%
7,0615,52312,603
D
+33.9%
7,5983,70611,473
D
+30.0%
6,9863,74310,827
R
−6.8%
4,2484,8719,157
R
−35.9%
1,3204,5559,011
R
−35.7%
2,6845,6708,359
D
+22.0%
5,3803,3699,157
R
−10.4%
2,8203,7398,868
R
−12.4%
3,6304,7288,854
R
−40.8%
1,8414,6546,899
D
+6.0%
3,0492,7025,826
D
+77.6%
2,5903232,923
R
−57.4%
0330575
—
No data
———
—
No data
———
—
No data
———
—
No data
———

Demographics

Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
English
30.7%
German
14.6%
Irish
7.3%
American
5.9%
Scottish
4.3%
French
2.5%
Italian
2.0%
Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
Age distribution by sex
Median age: 37.6 in this county, 39.1 nationally
Male
Age
Female
0.7%
85+
0.8%
2.4%
75–84
2.4%
5.2%
65–74
4.9%
6.0%
55–64
5.8%
5.8%
45–54
5.4%
7.1%
35–44
6.4%
5.5%
25–34
5.3%
4.5%
18–24
4.1%
11.2%
5–17
10.4%
3.3%
<5
3.1%
Source · American Community Survey 5-year estimates, 2024 release.
Median household income
2024 inflation-adjusted dollars
$77,818
State Senate District 31 ranks near the middle of US counties.
State Senate District 31$77,818
Idaho$77,800
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
10.3%
Child poverty is below the national average.
Children under 1812.2%
Working age (18–64)8.9%
Seniors (65+)15.8%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
90.1%
speak English only
Spanish8.6%
Other Indo-European0.8%
Asian & Pacific Islander0.3%
Other languages0.1%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Other Christian
69.1%
Catholic & Orthodox
7.5%
Baptist
1.6%
Mainline Protestant
1.0%
Methodist
0.5%
Pentecostal & Holiness
0.2%
Source · 2020 US Religion Census. Remaining 20.1% of residents not counted as adherents by any reporting body.

With a 2024 presidential margin of R+68.9, this rural district ranks among the most one-sided in the state, where general-election outcomes are largely decided in the Republican primary.

The Republican margin in Idaho 31st State Senate District reached its widest at seventy points in 2004. The margin in 2024 was sixty-nine points, in line with the district's deep historical pattern.

Its loyalty is rooted in its place. Median household income of $77,818, a 87% non-Hispanic-white share, and a population of 56,184 together describe a district whose political habits are deeply settled.

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.
State Senate District 31, Idaho. Akashic. https://akashic.app/sld-upper/16031/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0

Frequently asked questions

How did State Senate District 31, Idaho vote in 2024?
In 2024, State Senate District 31, Idaho voted Republican by 69.0 points (R+69), carried by the Republican candidate. Out of 27,823 votes cast, 3,932 went Democratic and 23,117 went Republican.
What is State Senate District 31, Idaho's political archetype?
Akashic classifies State Senate District 31, Idaho as a "Republican loyalist" district based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the district has voted Democratic 8 times, Republican 26 times, and other 0 times.
When did State Senate District 31, Idaho last vote Democratic?
The most recent presidential election in which State Senate District 31, Idaho voted Democratic was 1948.
How many people live in State Senate District 31, Idaho?
State Senate District 31, Idaho has a population of 56,184 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in State Senate District 31, Idaho?
Median household income in State Senate District 31, Idaho is $77,818 — below the national median of $80,734. The Idaho state median is $77,800.
What is the political history of State Senate District 31, Idaho?
Akashic tracks 38 presidential elections in State Senate District 31, Idaho from 1876 to 2024. Of those, 8 went Democratic and 26 went Republican. The district's archetype — "Republican loyalist" — captures the overall trajectory of that voting record.