Knox County, Illinois ZIP codes
17 ZIP codes are in Knox County, plus 6 that cross in from neighboring counties. It's part of the Galesburg, IL micro area.
- ZIP codes
- 17
- Population in these ZIPs
- 49,261
- Avg. median income
- $58,800population-weighted
- Cities & towns
- 16
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Knox County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 61401 | Galesburg | 30,580 | $50,546 | $105,400 |
| 61402 | Galesburg | 1,623 | — | — |
| 61410 | Abingdon | 3,838 | $62,925 | $97,800 |
| 61414 | Altona | 696 | $48,929 | $116,200 |
| 61428 | Dahinda | 1,278 | $77,143 | $353,500 |
| 61430 | East Galesburg | 713 | $79,333 | $123,700 |
| 61436 | Gilson | 745 | $76,000 | $205,000 |
| 61439 | Henderson | 299 | $59,125 | $113,900 |
| 61448 | Knoxville | 3,947 | $82,500 | $163,300 |
| 61458 | Maquon | 656 | $65,461 | $77,300 |
| 61467 | Oneida | 1,159 | $88,472 | $137,000 |
| 61472 | Rio | 453 | $76,500 | $150,000 |
| 61474 | Saint Augustine | 221 | $59,583 | $79,100 |
| 61485 | Victoria | 417 | $59,306 | $106,100 |
| 61488 | Wataga | 1,084 | $68,333 | $139,300 |
| 61489 | Williamsfield | 820 | $98,125 | $150,000 |
| 61572 | Yates City | 732 | $73,125 | $134,000 |
ZIP codes partly in Knox County
These ZIP codes are mostly in a neighboring county but cover part of Knox County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 61434 | Galva | Henry County | 2,971 | $56,780 | $112,800 |
| 61449 | La Fayette | Stark County | 339 | $51,635 | $116,600 |
| 61490 | Woodhull | Henry County | 1,035 | $65,625 | $157,000 |
| 61529 | Elmwood | Peoria County | 2,763 | $91,661 | $189,300 |
| 61531 | Farmington | Fulton County | 3,007 | $70,107 | $150,400 |
| 61544 | London Mills | Fulton County | 784 | $81,250 | $104,400 |
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 Knox County
Nearby counties
Frequently asked questions
How many ZIP codes are in Knox County, Illinois?
17 ZIP codes are mainly in Knox County, and 6 more ZIP codes from neighboring areas reach partly into it.
What cities are in Knox County?
ZIP codes in Knox County use the city names Abingdon, Altona, Dahinda, East Galesburg, Galesburg, Gilson, Henderson, Knoxville, Maquon, Oneida, Rio and Saint Augustine and others.
What metro area is Knox County in?
Knox County is part of the Galesburg, IL micropolitan statistical area.