Janesville, Iowa
Janesville is a city in Bremer County (89% of residents) and Black Hawk County (11%), Iowa, with 1,034 residents in 2020. It is in Iowa's 2nd congressional district. It spans 2 state senate and 2 state house districts.
County
| County | Share of residents |
|---|---|
| Bremer County | 89% |
| Black Hawk County | 11% |
Congressional district
| Congressional district | Share of residents |
|---|---|
| Iowa's 2nd congressional district (IA-02) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (IA-02) | Ashley Hinson (R) | 202-225-2911 | 100% |
| U.S. Senator | Chuck Grassley (R) | 202-224-3744 · contact form | statewide |
| U.S. Senator | Joni Ernst (R) | 202-224-3254 · contact form | statewide |
| State Senator (State Senate District 29) | Sandy Salmon (R) | 89% | |
| State Senator (State Senate District 27) | Annette Sweeney (R) | 11% | |
| State Representative (State House District 57) | Pat Grassley (R) | 89% | |
| State Representative (State House District 54) | Josh Meggers (R) | 11% |
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Janesville laws: search for the Janesville, Iowa code of ordinances
- Bremer County laws: search for the Bremer County, Iowa code of ordinances
- Black Hawk County website: http://www.co.black-hawk.ia.us
- Black Hawk County laws: search for the Black Hawk County, Iowa code of ordinances
State legislative districts
| State senate district | Share of residents |
|---|---|
| State Senate District 29 | 89% |
| State Senate District 27 | 11% |
| State house district | Share of residents |
|---|---|
| State House District 57 | 89% |
| State House District 54 | 11% |
ZIP codes
Percentages mark ZIPs only partly in Janesville: the share of that ZIP's residents living in it.
- 50647 (52%)
Get this in your AI agent
Your agent can get Janesville's counties and districts with shares, its ZIP codes (level='zcta'), and its boundary as GeoJSON (get_boundaries). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:place:1939405")
Janesville here is the Census Bureau's place boundary as of January 1, 2025. Shares are of 2020 Census population. Districts are the maps in force for the November 3, 2026 election.