County · Kentucky · United States
Allen County ZIP codes
3 ZIP codes · 3 cities · FIPS 21003
Key facts
- State
- Kentucky (KY)
- FIPS code
- 21003
- Population
- 21,029
- Median household income
- $59,029
- Median age
- 40.7
- Land area
- 344.3 sq mi (891.8 km²)
- Population density
- 61 / sq mi
- Area codes
- 270
Cities and ZIP codes in Allen County (3)
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.