Janesville city, Iowa
Official LSAD Designation: Janesville city • Census GEOID: 1939405
• Black Hawk County / Bremer County
Janesville city is an incorporated city in Black Hawk County, Bremer County, Iowa. According to official records from the Census (2025), Janesville city had an estimated population of 1,052 residents. Official Census Bureau geographic records classify this community under LSAD designation Janesville city (GEOID 1939405).
Local Government Administration U.S. Census Bureau GMAF
City Of Janesville
Municipal
Official Title:
City Clerk
Address:
PO BOX 146, JANESVILLE IA 50647-0146
County Of Black Hawk
County
Official Title:
Chairman
Address:
316 E 5TH ST, RM 201, WATERLOO IA 50703-4712
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 1,052 | 2025 |
| Median Household Income | $103,542 | 2020-2024 |
| Median Home Value | $221,700 | 2020-2024 |
| Land Area | 1.39 sq mi | Gazetteer (2026) |
| Civic & Public Services | Hospitals, Libraries, Colleges | CMS / IMLS / IPEDS |
| Schools & Districts | NCES Directory Listings | Provided by k12guides.com |
| Nearby Airports | Landing Facilities | Provided by airport-data.com |
| Climate & Weather | NOAA 30-Year Normals | 1991–2020 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).