County · Illinois · United States
DeKalb County ZIP codes
14 ZIP codes · 14 cities · FIPS 17037
Key facts
- State
- Illinois (IL)
- FIPS code
- 17037
- Population
- 100,512
- Median household income
- $69,022
- Median age
- 32.6
- Land area
- 631.3 sq mi (1,635.2 km²)
- Population density
- 159 / sq mi
- Area codes
- 779, 815
Cities and ZIP codes in DeKalb County (14)
About this page
County figures are Census county-level values (ACS 5-year); the ZIP list shows the ZIPs whose primary county this is — a ZIP on a border can also serve neighbouring counties.
Sources: U.S. Census Bureau (2020 county relationship file, ACS 5-year) · GeoNames. Methodology.