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County ZIP codes · Illinois · FIPS 17095

Knox County, IL ZIP Codes

Knox County, Illinois has 23 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 17 of the residential ones lie mainly in Knox County and 6 mainly in a neighboring county; 12 cross the county line. Median household income ranges from $50,546 in 61401 (Galesburg) to $91,661 in 61529 (Elmwood) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Knox County?

61401 · Galesburg: $51k61402 · Galesburg: –61410 · Abingdon: $63k61414 · Altona: $49k61428 · Dahinda: $77k61430 · East Galesburg: $79k61434 · Galva: $57k61436 · Gilson: $76k61439 · Henderson: $59k61448 · Knoxville: $83k61449 · La Fayette: $52k61458 · Maquon: $66k61467 · Oneida: $89k61472 · Rio: $77k61474 · Saint Augustine: $60k61485 · Victoria: $59k61488 · Wataga: $68k61489 · Williamsfield: $98k61490 · Woodhull: $66k61529 · Elmwood: $92k61531 · Farmington: $70k61544 · London Mills: $81k61572 · Yates City: $73k614016143461529614586143661414614676148561448615316148961544614106144961490615726142861472614886147461401 · Galesburg: $51k61402 · Galesburg: –61410 · Abingdon: $63k61414 · Altona: $49k61428 · Dahinda: $77k61430 · East Galesburg: $79k61434 · Galva: $57k61436 · Gilson: $76k61439 · Henderson: $59k61448 · Knoxville: $83k61449 · La Fayette: $52k61458 · Maquon: $66k61467 · Oneida: $89k61472 · Rio: $77k61474 · Saint Augustine: $60k61485 · Victoria: $59k61488 · Wataga: $68k61489 · Williamsfield: $98k61490 · Woodhull: $66k61529 · Elmwood: $92k61531 · Farmington: $70k61544 · London Mills: $81k61572 · Yates City: $73k6140161434615296145861436614146146761485614486153161489615446141061449614906157261472614886147461401 · Galesburg: $51k61402 · Galesburg: –61410 · Abingdon: $63k61414 · Altona: $49k61428 · Dahinda: $77k61430 · East Galesburg: $79k61434 · Galva: $57k61436 · Gilson: $76k61439 · Henderson: $59k61448 · Knoxville: $83k61449 · La Fayette: $52k61458 · Maquon: $66k61467 · Oneida: $89k61472 · Rio: $77k61474 · Saint Augustine: $60k61485 · Victoria: $59k61488 · Wataga: $68k61489 · Williamsfield: $98k61490 · Woodhull: $66k61529 · Elmwood: $92k61531 · Farmington: $70k61544 · London Mills: $81k61572 · Yates City: $73k61401614346152961458614366141461467614856144861531614896154461410614496149061572614726148861474
The residential ZIP codes of Knox County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $56,780 and $70,107.

They carry 22 postal town names.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 23 residential ZIP codes in Knox County

17 ZIP codes lie mainly in Knox County; 6 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Knox County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
61401 Galesburg 30,580 249 $51k $101k 80%
61448 Knoxville 3,947 96 $83k $146k 100%
61410 Abingdon 3,838 85 $63k $104k 72%
61402 Galesburg 1,623 19,554 – – 100%
61428 Dahinda 1,278 43 $77k $285k 100%
61467 Oneida 1,159 22 $89k $137k 100%
61488 Wataga 1,084 46 $68k $113k 100%
61489 Williamsfield 820 17 $98k $149k 97%
61436 Gilson 745 12 $76k $205k 100%
61572 Yates City 732 19 $73k $116k 100%
61430 East Galesburg 713 482 $79k $124k 100%
61414 Altona 696 13 $49k $134k 79%
61458 Maquon 656 8 $66k $77k 100%
61472 Rio 453 12 $77k $150k 99%
61485 Victoria 417 9 $59k $106k 100%
61439 Henderson 299 239 $59k $114k 100%
61474 Saint Augustine 221 8 $60k $79k 76%

Partly in Knox County

Residential ZIP codes mainly in another county that reach at least 1% into Knox County, by their share here
In this county
61449 La Fayette 339 9 $52k $66k 31%
61544 London Mills 784 20 $81k $96k 30%
61434 Galva 2,971 38 $57k $100k 25%
61531 Farmington 3,007 53 $70k $128k 23%
61490 Woodhull 1,035 28 $66k $158k 13%
61529 Elmwood 2,763 43 $92k $165k 2%

Download the 23 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

12 ZIP codes of Knox County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Knox County and in the neighboring counties
ZIPIn KnoxElsewhere
6140180%Warren County 20%
6141072%Warren County 28%
6153123%Fulton County 63%; Peoria County 14%
6143425%Henry County 74%
615292%Peoria County 98%
6149013%Henry County 87%
6148997%Peoria County 3%
6154430%Fulton County 70%
6141479%Henry County 21%
6147299%Mercer County 1%
6144931%Stark County 69%
6147476%Warren County 17%; Fulton County 7%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

Which first three digits do Knox County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Knox County's ZIP codes use 2 prefixes: 614 and 615.

Three-digit prefixes of Knox County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Knox County's
PrefixSectional centerHereAll codes
614 Peoria, IL (SCF 615) 19 73
615 Peoria, IL (SCF 615) 4 48

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.