DeKalb city, Illinois
Official LSAD Designation: DeKalb city • Census GEOID: 1719161
• DeKalb County
DeKalb city is an incorporated city in DeKalb County, Illinois. According to official records from the Census (2025), DeKalb city had an estimated population of 40,467 residents. Official Census Bureau geographic records classify this community under LSAD designation DeKalb city (GEOID 1719161).
Local Government Administration U.S. Census Bureau GMAF
City Of De Kalb
Municipal
Official Title:
Finance Director
Address:
200 S 4TH ST, DEKALB IL 60115-3720
County Of Dekalb
County
Official Title:
County Administrator
Address:
200 N MAIN ST, SYCAMORE IL 60178-1431
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 40,467 | 2025 |
| Median Household Income | $46,481 | 2020-2024 |
| Median Home Value | $204,700 | 2020-2024 |
| Land Area | 17.80 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).