Ottawa city, Illinois
Official LSAD Designation: Ottawa city • Census GEOID: 1756926
• LaSalle County
Ottawa city is an incorporated city in LaSalle County, Illinois. According to official records from the Census (2025), Ottawa city had an estimated population of 18,684 residents. Official Census Bureau geographic records classify this community under LSAD designation Ottawa city (GEOID 1756926).
Local Government Administration U.S. Census Bureau GMAF
City Of Ottawa
Municipal
Official Title:
City Clerk
Address:
301 W MADISON ST, OTTAWA IL 61350-2820
County Of Lasalle
County
Official Title:
Chairman
Address:
707 E ETNA RD, ROOM 245, OTTAWA IL 61350-1047
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 18,684 | 2025 |
| Median Household Income | $71,413 | 2020-2024 |
| Median Home Value | $154,000 | 2020-2024 |
| Land Area | 14.88 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).