Districts › Senate
Senate District 8
Every race for this seat since 2018, with campaign money →
Represented by
Sen. Mark Costello Republican · Mills
Members elected in November 2026 take office when the 92nd General Assembly convenes on Monday, January 11, 2027. Funnel will show them here once the Legislature publishes the new roster.
Registered voters
41,551 active voters, November 2026. Republicans lead by 15,582.
| November 2026 | November 2025 | June 2022 | |
|---|---|---|---|
| Republican | 23,435 56.4% | 22,854 56.7% | 22,046 53.3% |
| Democratic | 7,853 18.9% | 7,311 18.1% | 8,601 20.8% |
| No party | 9,886 23.8% | 9,769 24.2% | 10,318 25.0% |
| Other parties | 377 0.9% | 405 1.0% | 371 0.9% |
Active registrations from the Secretary of State’s monthly totals (Iowa Data Hub); a Senate district is two House districts. Inactive registrations (about 12.9% of the total) aren’t counted.
Who lives here
- People2.0% of Iowans63,963
- Median household incomeIowa: $75,501$88,348
- Median ageIowa: 39.043.0
- Adults with a bachelor’s degree or moreIowa: 32.1%28.6%
- Below the poverty lineIowa: 11.3%6.3%
- Homes lived in by their ownersIowa: 71.3%82.7%
U.S. Census Bureau, ACS 2024 5-year estimates (via Census Reporter). Survey estimates have margins of error, larger for small groups.
Who has held this seat
Since the 90th General Assembly (2023), the first elected under the district maps drawn in 2021. Earlier districts with this number covered different areas.