Monroe County, Illinois ZIP codes
8 ZIP codes are in Monroe County, plus 2 that cross in from neighboring counties. It's part of the St. Louis, MO-IL metro area.
- ZIP codes
- 8
- Population in these ZIPs
- 41,698
- Avg. median income
- $100,100population-weighted
- Cities & towns
- 8
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Monroe County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 62236 | Columbia | 14,154 | $108,981 | $343,000 |
| 62244 | Fults | 928 | $107,917 | $304,900 |
| 62248 | Hecker | 521 | $79,583 | $212,100 |
| 62256 | Maeystown | 35 | $126,250 | $158,300 |
| 62278 | Red Bud | 6,281 | $79,688 | $252,800 |
| 62279 | Renault | 112 | $139,063 | — |
| 62295 | Valmeyer | 1,459 | $87,989 | $257,800 |
| 62298 | Waterloo | 18,208 | $101,155 | $325,200 |
ZIP codes partly in Monroe County
These ZIP codes are mostly in a neighboring county but cover part of Monroe County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 62264 | New Athens | St. Clair County | 3,097 | $57,015 | $160,900 |
| 62277 | Prairie Du Rocher | Randolph County | 940 | $67,969 | $161,800 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Monroe County
Nearby counties
Frequently asked questions
How many ZIP codes are in Monroe County, Illinois?
8 ZIP codes are mainly in Monroe County, and 2 more ZIP codes from neighboring areas reach partly into it.
What cities are in Monroe County?
ZIP codes in Monroe County use the city names Columbia, Fults, Hecker, Maeystown, Red Bud, Renault, Valmeyer and Waterloo.
What metro area is Monroe County in?
Monroe County is part of the St. Louis, MO-IL metropolitan statistical area.