County · Illinois · United States
Montgomery County ZIP codes
16 ZIP codes · 16 cities · FIPS 17135
Key facts
- State
- Illinois (IL)
- FIPS code
- 17135
- Population
- 28,078
- Median household income
- $61,863
- Median age
- 42.6
- Land area
- 703.8 sq mi (1,822.7 km²)
- Population density
- 40 / sq mi
- Area codes
- 217, 447
Cities and ZIP codes in Montgomery County (16)
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.