Colchester city, Illinois
Official LSAD Designation: Colchester city • Census GEOID: 1715378
• McDonough County
Colchester city is an incorporated city in McDonough County, Illinois. According to official records from the Census (2025), Colchester city had an estimated population of 1,070 residents. Official Census Bureau geographic records classify this community under LSAD designation Colchester city (GEOID 1715378).
Local Government Administration U.S. Census Bureau GMAF
City Of Colchester
Municipal
Official Title:
Clerk
Address:
PO BOX 259, COLCHESTER IL 62326-0259
County Of Mcdonough
County
Official Title:
County Clerk
Address:
1 COURTHOUSE SQ, MACOMB IL 61455-2267
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 1,070 | 2025 |
| Median Household Income | $63,981 | 2020-2024 |
| Median Home Value | $91,700 | 2020-2024 |
| Land Area | 1.15 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).