Knox County, IL ZIP codes
Knox County ZIP codes by town
Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.
Map of Knox County ZIP codes
The ZIP codes of Knox County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
Knox County in numbers
About 49,046 people live in Knox County, in 20,972 households, the 29th most populous of Illinois's 102 counties. The median household income is $57,030 a year, 32% below the Illinois median of $83,390 (US: $80,734). The median owner-occupied home is valued at $111,900 (58% below the Illinois median), and median gross rent is $788 a month. The median age is 42.6; 21.0% of adults 25 and over hold a bachelor's degree or higher (37.8% across Illinois); the average commute takes 20 minutes.
| Population | 49,046 |
|---|---|
| Households | 20,972 |
| Median age | 42.6 |
| Median household income | $57,030 |
| Median home value | $111,900 |
| Median gross rent | $788 |
| Bachelor's degree or higher | 21.0% |
| Mean commute | 20.4 min |
| Population density | 68 / sq mi |
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.
Largest towns in Knox County
| Town | ZIP codes | Population |
|---|---|---|
| Galesburg | 2 | 29,481 |
| Abingdon | 1 | 3,443 |
| Knoxville | 1 | 3,211 |
| Dahinda | 1 | 1,278 |
| Oneida | 1 | 719 |
| East Galesburg | 1 | 713 |
| Wataga | 1 | 710 |
| Williamsfield | 1 | 531 |
| Yates City | 1 | 500 |
| Altona | 1 | 498 |
| Henderson | 1 | 284 |
| Victoria | 1 | 254 |
| Rio | 1 | 205 |
| Maquon | 1 | 161 |
| Gilson | 1 | 120 |
Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.
Neighbouring counties
Counties that share a ZIP code with Knox County.
- Peoria County (45)
- Henry County (16)
- Fulton County (20)
- Warren County (8)
- Mercer County (13)
- Stark County (5)
Not sure you are in Knox County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Knox County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
61401 | Galesburg , IL | Standard | 30,580 | $50,546 | $100,600 |
61402 | Galesburg , IL | Standard | 1,623 | — | — |
61410 | Abingdon , IL | Standard | 3,838 | $62,925 | $104,300 |
61414 | Altona , IL | Standard | 696 | $48,929 | $134,400 |
61428 | Dahinda , IL | Standard | 1,278 | $77,143 | $285,100 |
61430 | East Galesburg , IL | Standard | 713 | $79,333 | $123,700 |
61436 | Gilson , IL | Standard | 745 | $76,000 | $205,000 |
61439 | Henderson , IL | Standard | 299 | $59,125 | $113,900 |
61448 | Knoxville , IL | Standard | 3,947 | $82,500 | $146,100 |
61458 | Maquon , IL | Standard | 656 | $65,461 | $77,300 |
61467 | Oneida , IL | Standard | 1,159 | $88,472 | $136,700 |
61472 | Rio , IL | Standard | 453 | $76,500 | $150,000 |
61474 | Saint Augustine , IL | Standard | 221 | $59,583 | $79,100 |
61485 | Victoria , IL | Standard | 417 | $59,306 | $106,100 |
61488 | Wataga , IL | Standard | 1,084 | $68,333 | $112,900 |
61489 | Williamsfield , IL | Standard | 820 | $98,125 | $148,500 |
61572 | Yates City , IL | Standard | 732 | $73,125 | $116,100 |
Cite this page
zipcodes.pro. “Knox County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/il/county/knox
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