Kansas State Senate District 18

State Legislative District Profile (Upper Chamber)

Overview

District ID
ks-sd-018
State
Kansas
Chamber
Upper chamber (state senate)
District Code
018
Land Area
1,431.4 sq mi
Water Area
48.8 sq mi

Boundary

Boundary of Kansas State Senate District 18

Boundary as GeoJSON

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

Counties

CountyOverlapShare of district landShare of county land
Pottawatomie County840.74 sq mi58.7%100.0%
Jefferson County348.57 sq mi24.4%65.4%
Shawnee County242.13 sq mi16.9%44.5%

Showing all 3 counties

Places

PlaceOverlapShare of district landShare of place land
Topeka city13.32 sq mi0.9%21.5%
Wamego city2.36 sq mi0.2%89.5%
Manhattan city1.19 sq mi0.1%5.8%
St. Marys city1.18 sq mi0.1%99.9%
Oskaloosa city0.99 sq mi0.1%100.0%
Meriden city0.76 sq mi0.1%98.3%
Perry city0.75 sq mi0.1%100.0%
Onaga city0.66 sq mi<0.1%100.0%
St. George city0.64 sq mi<0.1%100.0%
Grantville CDP0.61 sq mi<0.1%100.0%
McLouth city0.58 sq mi<0.1%100.0%
Silver Lake city0.56 sq mi<0.1%100.0%
Rossville city0.55 sq mi<0.1%99.9%
Louisville city0.50 sq mi<0.1%100.0%
Westmoreland city0.49 sq mi<0.1%100.0%
Ozawkie city0.30 sq mi<0.1%99.9%
Olsburg city0.24 sq mi<0.1%100.0%
Emmett city0.20 sq mi<0.1%100.0%
Wheaton city0.15 sq mi<0.1%100.0%
Havensville city0.15 sq mi<0.1%100.0%
Belvue city0.12 sq mi<0.1%99.8%
Williamstown CDP0.12 sq mi<0.1%99.9%
Willard city0.10 sq mi<0.1%95.8%

Showing all 23 places

Overlapping Congressional Districts

Congressional districtPopulation in bothShare of this district's populationShare of the congressional district's populationShare of this district's land
KS District 139,96554.0%5.4%83.1%
KS District 233,98246.0%4.6%16.9%

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

Voters

Registered Voters
53,928
Active Voters
51,414 (95.3%)

Party Registration

PartyVotersShare
Democratic10,00718.6%
Republican28,66753.2%
Unaffiliated14,50926.9%
Other parties7451.4%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2023–202440,149 (74.4%)0 (0.0%)0 (0.0%)
2021–202230,688 (56.9%)0 (0.0%)0 (0.0%)
2019–202037,187 (69.0%)0 (0.0%)0 (0.0%)
2017–201828,328 (52.5%)0 (0.0%)0 (0.0%)
2015–201629,944 (55.5%)0 (0.0%)0 (0.0%)
2013–201422,512 (41.7%)0 (0.0%)0 (0.0%)
2011–201224,676 (45.8%)0 (0.0%)0 (0.0%)

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 11/03/2025. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Population
73,346 (± 972)
Median Age
39.8
Median Household Income
$83,549 (± $4,760)
High School Graduate or Higher (age 25+)
95.3%
Bachelor's Degree or Higher (age 25+)
32.4%

Population by Age

GroupPeopleShare
Under 1818,28624.9%
18 to 6441,78457.0%
65 and over13,27618.1%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)4,0465.5%
White, not Hispanic62,99985.9%
Black, not Hispanic1,4382.0%
Asian, not Hispanic4320.6%
American Indian / Alaska Native, not Hispanic3620.5%
Native Hawaiian / Pacific Islander, not Hispanic290.0%
Some other race, not Hispanic5770.8%
Two or more races, not Hispanic3,4634.7%

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
72,753
Citizen Voting Age Population (CVAP)
54,522

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic68,91094.7%
Hispanic3,8475.3%
White64,00988.0%
Black1,4171.9%
Asian3280.5%
American Indian / Alaska Native3630.5%
Native Hawaiian / Pacific Islander290.0%
Two or More Races5700.8%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic52,04395.5%
Hispanic2,4764.5%
White49,07890.0%
Black1,2032.2%
Asian4690.9%
American Indian / Alaska Native1,1882.2%
Native Hawaiian / Pacific Islander240.0%
Two or More Races1940.4%

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