Iowa State Senate District 20

State Legislative District Profile (Upper Chamber)

Overview

District ID
ia-sd-020
State
Iowa
Chamber
Upper chamber (state senate)
District Code
020
Land Area
58.7 sq mi
Water Area
0.49 sq mi

Boundary

Boundary of Iowa State Senate District 20

Boundary as GeoJSON

Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.

Counties

CountyOverlapShare of district landShare of county land
Polk County58.75 sq mi100.0%10.3%

Showing all 1 county

Places

PlaceOverlapShare of district landShare of place land
Altoona city11.68 sq mi19.9%87.7%
Pleasant Hill city10.42 sq mi17.8%96.5%
Des Moines city9.83 sq mi16.8%11.2%
Saylorville CDP1.77 sq mi3.0%26.0%
Ankeny city0.97 sq mi1.7%3.1%

Showing all 5 places

Overlapping Congressional Districts

Congressional districtPopulation in bothShare of this district's populationShare of the congressional district's populationShare of this district's land
IA District 364,031100.0%8.0%100.0%

Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).

Voters

Registered Voters
41,968
Active Voters
35,480 (84.5%)

Party Registration

PartyVotersShare
Democratic13,72332.7%
Republican12,85430.6%
Unaffiliated14,93335.6%
Other parties4581.1%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–20268,469 (20.2%)0 (0.0%)0 (0.0%)
2023–202432,747 (78.0%)1,383 (3.3%)771 (1.8%)
2021–202223,132 (55.1%)3,278 (7.8%)3,074 (7.3%)
2019–202030,619 (73.0%)5,337 (12.7%)2,892 (6.9%)
2017–201822,494 (53.6%)3,749 (8.9%)1,038 (2.5%)
2015–201624,817 (59.1%)1,855 (4.4%)739 (1.8%)
2013–201416,461 (39.2%)517 (1.2%)1,801 (4.3%)
2011–201222,246 (53.0%)308 (0.7%)750 (1.8%)

Turnout counts today's registered voters with a counted ballot in the cycle's elections (the odd and even year), as a share of today's registered voters. Voters who have since left the rolls are not counted.

Browse the voter list for this district (premium access; sign-in required)

Source: Civitech voter file snapshot as of 01/20/2026. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Population
67,817 (± 1,913)
Median Age
36.2
Median Household Income
$76,518 (± $3,104)
High School Graduate or Higher (age 25+)
93.0%
Bachelor's Degree or Higher (age 25+)
28.2%

Population by Age

GroupPeopleShare
Under 1817,79826.2%
18 to 6438,77157.2%
65 and over11,24816.6%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)6,5569.7%
White, not Hispanic51,54976.0%
Black, not Hispanic4,7557.0%
Asian, not Hispanic2,1563.2%
American Indian / Alaska Native, not Hispanic430.1%
Native Hawaiian / Pacific Islander, not Hispanic70.0%
Some other race, not Hispanic720.1%
Two or more races, not Hispanic2,6794.0%

Source: U.S. Census Bureau, American Community Survey 2020-2024 ACS 5-year estimates (tables B01001, B01002, B01003, B03002, B15003, B19013) for this state legislative district. Estimates are survey-based; ± figures are 90% margins of error.

Citizen Voting Age Population

Total Citizen Population
65,845
Citizen Voting Age Population (CVAP)
48,161

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic60,18691.4%
Hispanic5,6618.6%
White52,09279.1%
Black4,0966.2%
Asian1,8572.8%
American Indian / Alaska Native440.1%
Native Hawaiian / Pacific Islander40.0%
Two or More Races1830.3%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic45,37294.2%
Hispanic2,7915.8%
White40,50184.1%
Black2,5755.3%
Asian1,9364.0%
American Indian / Alaska Native2060.4%
Native Hawaiian / Pacific Islander70.0%
Two or More Races1510.3%

Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).