ZIP codes
17
Knox County, IL Demographics & ZIP Codes
Knox County, Illinois demographics and median household income by ZIP code — 17 ZIP codes — population 49,464 — avg. income $67,799 — avg. home value $124,413. Compare income, housing, and ZIP-level data on US5.
Population
49,464
Median household income (avg.)
$67,799
90% of U.S. median
Average home value
$124,413
36% of U.S. median
Average rent
$494
43% of U.S. median
Knox County demographics
Knox County, Illinois covers 17 ZIP codes, with a combined ZIP-area population of about 49,464.
Median household income in Knox County
The average median household income across ZIP codes in Knox County, Illinois is about $67,799 — about 13% below the IL ZIP average ($78,143), and about 10% below the U.S. median ($75,149).
Among ZIPs with income data, 61489 (Williamsfield) is near the top at about $83,625, while 61401 (Galesburg) is near the bottom at about $47,728.
Housing in Knox County
For housing in Knox County, Illinois, the average median home value is about $124,413 and the average median rent is about $494.
The most populous ZIP is 61401 (Galesburg) with about 30,684 residents. Use the table below to compare ZIP codes across the county.
ZIP codes in Knox County
Sort by population, income, or home value. Click a column header to toggle ascending / descending.
| ZIP | City | County | State | Population ↓ | Income | Home value |
|---|---|---|---|---|---|---|
| 61401 | Galesburg | Knox County | IL | 30,684 | $47,728 | $94,900 |
| 61448 | Knoxville | Knox County | IL | 3,906 | $79,500 | $139,700 |
| 61410 | Abingdon | Knox County | IL | 3,763 | $57,307 | $93,000 |
| 61402 | Galesburg | Knox County | IL | 1,634 | — | — |
| 61467 | Oneida | Knox County | IL | 1,262 | $82,917 | $132,700 |
| 61488 | Wataga | Knox County | IL | 1,230 | $61,786 | $125,000 |
| 61428 | Oak Run | Knox County | IL | 1,153 | $81,875 | $250,000 |
| 61572 | Yates City | Knox County | IL | 916 | $68,229 | $95,100 |
| 61436 | Gilson | Knox County | IL | 810 | $74,688 | $186,500 |
| 61489 | Williamsfield | Knox County | IL | 743 | $83,625 | $131,300 |
| 61414 | Altona | Knox County | IL | 731 | $62,617 | $122,200 |
| 61430 | East Galesburg | Knox County | IL | 676 | $65,750 | $106,000 |
| 61458 | Maquon | Knox County | IL | 632 | $62,604 | $88,600 |
| 61472 | Rio | Knox County | IL | 430 | $80,192 | $149,400 |
| 61485 | Victoria | Knox County | IL | 388 | $62,188 | $100,600 |
| 61439 | Henderson | Knox County | IL | 268 | $56,429 | $97,500 |
| 61474 | St. Augustine | Knox County | IL | 238 | $57,353 | $78,100 |
Frequently asked questions
What are the demographics of Knox County?
Knox County, Illinois has a combined ZIP-area population of about 49,464 across 17 ZIP codes. Browse the ZIP table for population, income, and housing by code.
What is the median household income in Knox County?
The average median household income across ZIP codes in Knox County, Illinois is about $67,799, about 13% below the state ZIP average ($78,143), and about 10% below the U.S. median ($75,149). Average median home value is about $124,413. Among ZIPs with data, 61489 (Williamsfield) is near the top ($83,625) and 61401 (Galesburg) is near the bottom ($47,728).
How many ZIP codes are in Knox County?
Knox County, Illinois includes 17 ZIP codes on US5. Each row links to demographics, median income, and housing for that code.
Where can I find ZIP code demographics for Knox County?
This page lists ZIP codes in Knox County, Illinois with population, median household income, and home value. Select a ZIP for a full demographics profile.