Iowa State Senate District 1

State Legislative District Profile (Upper Chamber)

Overview

District ID
ia-sd-001
State
Iowa
Chamber
Upper chamber (state senate)
District Code
001
Land Area
110.8 sq mi
Water Area
0.72 sq mi

Boundary

Boundary of Iowa State Senate District 1

Boundary as GeoJSON

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

Counties

CountyOverlapShare of district landShare of county land
Woodbury County110.82 sq mi100.0%12.7%

Showing all 1 county

Places

PlaceOverlapShare of district landShare of place land
Sioux City city39.44 sq mi35.6%66.7%
Lawton city0.72 sq mi0.6%100.0%

Showing all 2 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 463,991100.0%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
32,147
Active Voters
24,139 (75.1%)

Party Registration

PartyVotersShare
Democratic9,79430.5%
Republican10,70733.3%
Unaffiliated11,31335.2%
Other parties3331.0%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–20265,937 (18.5%)0 (0.0%)0 (0.0%)
2023–202421,685 (67.5%)609 (1.9%)1,536 (4.8%)
2021–202213,544 (42.1%)1,500 (4.7%)2,380 (7.4%)
2019–202020,861 (64.9%)3,074 (9.6%)4,037 (12.6%)
2017–201814,861 (46.2%)1,922 (6.0%)1,401 (4.4%)
2015–201616,502 (51.3%)901 (2.8%)2,086 (6.5%)
2013–201411,009 (34.2%)659 (2.0%)1,707 (5.3%)
2011–201214,727 (45.8%)454 (1.4%)1,426 (4.4%)

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
64,766 (± 1,322)
Median Age
34.6
Median Household Income
$66,408 (± $3,470)
High School Graduate or Higher (age 25+)
83.5%
Bachelor's Degree or Higher (age 25+)
21.1%

Population by Age

GroupPeopleShare
Under 1816,97326.2%
18 to 6438,47659.4%
65 and over9,31714.4%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)17,09226.4%
White, not Hispanic37,91458.5%
Black, not Hispanic3,4525.3%
Asian, not Hispanic1,5842.4%
American Indian / Alaska Native, not Hispanic1,0041.6%
Native Hawaiian / Pacific Islander, not Hispanic6271.0%
Some other race, not Hispanic1940.3%
Two or more races, not Hispanic2,8994.5%

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
59,289
Citizen Voting Age Population (CVAP)
42,968

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic46,25678.0%
Hispanic13,03122.0%
White38,47164.9%
Black2,6964.5%
Asian1,2292.1%
American Indian / Alaska Native1,0041.7%
Native Hawaiian / Pacific Islander5200.9%
Two or More Races4700.8%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic36,24584.4%
Hispanic6,72915.7%
White31,25972.7%
Black2,3545.5%
Asian1,2512.9%
American Indian / Alaska Native1,0342.4%
Native Hawaiian / Pacific Islander2490.6%
Two or More Races1050.2%

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