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County ZIP codes · Illinois · FIPS 17187

Warren County, IL ZIP Codes

Warren County, Illinois has 14 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 8 of the residential ones lie mainly in Warren County and 6 mainly in a neighboring county; 10 cross the county line. Median household income ranges from $50,546 in 61401 (Galesburg) to $82,143 in 61412 (Alexis) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Warren County?

61401 · Galesburg: $51k61410 · Abingdon: $63k61412 · Alexis: $82k61415 · Avon: $68k61417 · Berwick: $106k61423 · Cameron: $79k61435 · Gerlaw: –61447 · Kirkwood: $83k61453 · Little York: $58k61462 · Monmouth: $64k61473 · Roseville: $61k61474 · Saint Augustine: $60k61475 · Sciota: $85k61478 · Smithshire: $76k614626140161415614736141261453614476142361410614756147861474614176143561401 · Galesburg: $51k61410 · Abingdon: $63k61412 · Alexis: $82k61415 · Avon: $68k61417 · Berwick: $106k61423 · Cameron: $79k61435 · Gerlaw: –61447 · Kirkwood: $83k61453 · Little York: $58k61462 · Monmouth: $64k61473 · Roseville: $61k61474 · Saint Augustine: $60k61475 · Sciota: $85k61478 · Smithshire: $76k614626140161415614736141261453614476142361410614756147861474614176143561401 · Galesburg: $51k61410 · Abingdon: $63k61412 · Alexis: $82k61415 · Avon: $68k61417 · Berwick: $106k61423 · Cameron: $79k61435 · Gerlaw: –61447 · Kirkwood: $83k61453 · Little York: $58k61462 · Monmouth: $64k61473 · Roseville: $61k61474 · Saint Augustine: $60k61475 · Sciota: $85k61478 · Smithshire: $76k6146261401614156147361412614536144761423614106147561478614746141761435
The residential ZIP codes of Warren 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 $60,833 and $64,113.

They carry 14 postal town names.

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

All 14 residential ZIP codes in Warren County

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

Residential ZIP codes mainly in Warren County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
61462 Monmouth 10,458 74 $64k $103k 96%
61473 Roseville 1,279 12 $61k $108k 100%
61447 Kirkwood 1,020 24 $83k $96k 69%
61453 Little York 677 12 $58k $88k 58%
61423 Cameron 638 15 $79k $124k 100%
61478 Smithshire 420 12 $76k $104k 86%
61435 Gerlaw 271 16 – – 100%
61417 Berwick 182 8 $106k $107k 100%

Partly in Warren County

Residential ZIP codes mainly in another county that reach at least 1% into Warren County, by their share here
In this county
61412 Alexis 1,392 17 $82k $118k 45%
61415 Avon 1,459 13 $68k $113k 37%
61410 Abingdon 3,838 85 $63k $104k 28%
61401 Galesburg 30,580 249 $51k $101k 20%
61474 Saint Augustine 221 8 $60k $79k 17%
61475 Sciota 180 5 $85k $141k 12%

Download the 14 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?

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

Share of each ZIP code's land in Warren County and in the neighboring counties
ZIPIn WarrenElsewhere
6140120%Knox County 80%
6146296%Henderson County 4%
6141028%Knox County 72%
6141537%Fulton County 63%
6141245%Mercer County 55%
6144769%Henderson County 31%
6145358%Henderson County 42%
6147886%Henderson County 14%
6147417%Knox County 76%; Fulton County 7%
6147512%McDonough County 86%; Henderson County 2%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Warren County starts with 614.

Three-digit prefixes of Warren 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 Warren County's
PrefixSectional centerHereAll codes
614 Peoria, IL (SCF 615) 14 73

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