Warren County, Illinois ZIP codes
8 ZIP codes are in Warren County, plus 6 that cross in from neighboring counties.
- ZIP codes
- 8
- Population in these ZIPs
- 14,945
- Avg. median income
- $66,300population-weighted
- Cities & towns
- 8
Loading map…
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Warren County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 61417 | Berwick | 182 | $105,724 | $107,200 |
| 61423 | Cameron | 638 | $78,594 | $163,600 |
| 61435 | Gerlaw | 271 | — | — |
| 61447 | Kirkwood | 1,020 | $82,583 | $105,700 |
| 61453 | Little York | 677 | $58,281 | $121,500 |
| 61462 | Monmouth | 10,458 | $64,113 | $112,000 |
| 61473 | Roseville | 1,279 | $60,833 | $101,600 |
| 61478 | Smithshire | 420 | $75,625 | $152,500 |
ZIP codes partly in Warren County
These ZIP codes are mostly in a neighboring county but cover part of Warren County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 61401 | Galesburg | Knox County | 30,580 | $50,546 | $105,400 |
| 61410 | Abingdon | Knox County | 3,838 | $62,925 | $97,800 |
| 61412 | Alexis | Mercer County | 1,392 | $82,143 | $151,300 |
| 61415 | Avon | Fulton County | 1,459 | $68,036 | $147,300 |
| 61474 | Saint Augustine | Knox County | 221 | $59,583 | $79,100 |
| 61475 | Sciota | McDonough County | 180 | $85,000 | $141,100 |
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 Warren County
Nearby counties
Frequently asked questions
How many ZIP codes are in Warren County, Illinois?
8 ZIP codes are mainly in Warren County, and 6 more ZIP codes from neighboring areas reach partly into it.
What cities are in Warren County?
ZIP codes in Warren County use the city names Berwick, Cameron, Gerlaw, Kirkwood, Little York, Monmouth, Roseville and Smithshire.