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County ZIP codes · Illinois · FIPS 17015

Carroll County, IL ZIP Codes

Carroll County, Illinois has 10 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 7 of the residential ones lie mainly in Carroll County and 3 mainly in a neighboring county; 8 cross the county line. Median household income ranges from $50,691 in 61074 (Savanna) to $80,867 in 61270 (Morrison) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Carroll County?

61014 · Chadwick: $69k61046 · Lanark: $79k61051 · Milledgeville: $60k61053 · Mount Carroll: $62k61062 · Pearl City: $67k61064 · Polo: $75k61074 · Savanna: $51k61078 · Shannon: $76k61270 · Morrison: $81k61285 · Thomson: $69k6107461270610536106461046610786101461062612856105161014 · Chadwick: $69k61046 · Lanark: $79k61051 · Milledgeville: $60k61053 · Mount Carroll: $62k61062 · Pearl City: $67k61064 · Polo: $75k61074 · Savanna: $51k61078 · Shannon: $76k61270 · Morrison: $81k61285 · Thomson: $69k6107461270610536106461046610786101461062612856105161014 · Chadwick: $69k61046 · Lanark: $79k61051 · Milledgeville: $60k61053 · Mount Carroll: $62k61062 · Pearl City: $67k61064 · Polo: $75k61074 · Savanna: $51k61078 · Shannon: $76k61270 · Morrison: $81k61285 · Thomson: $69k61074612706105361064610466107861014610626128561051
The residential ZIP codes of Carroll 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 $62,250 and $75,386.

They carry 10 postal town names.

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

All 10 residential ZIP codes in Carroll County

7 ZIP codes lie mainly in Carroll County; 3 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Carroll County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
61074 Savanna 3,962 54 $51k $92k 98%
61046 Lanark 2,794 33 $79k $167k 100%
61285 Thomson 2,728 61 $69k $173k 100%
61053 Mount Carroll 2,590 24 $62k $107k 90%
61051 Milledgeville 1,469 29 $60k $104k 96%
61078 Shannon 1,459 26 $76k $133k 66%
61014 Chadwick 1,067 17 $69k $104k 85%

Partly in Carroll County

Residential ZIP codes mainly in another county that reach at least 1% into Carroll County, by their share here
In this county
61064 Polo 3,757 35 $75k $164k 4%
61062 Pearl City 1,840 25 $67k $197k 2%
61270 Morrison 6,912 46 $81k $165k 1%

Download the 10 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?

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

Share of each ZIP code's land in Carroll County and in the neighboring counties
ZIPIn CarrollElsewhere
612701%Whiteside County 99%
6107498%Jo Daviess County 2%
610644%Ogle County 94%; Lee County 1%
6105390%Jo Daviess County 10%
610622%Stephenson County 91%; Jo Daviess County 7%
6105196%Ogle County 4%
6107866%Stephenson County 18%; Ogle County 16%
6101485%Whiteside County 15%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Carroll County's ZIP codes use 2 prefixes: 610 and 612.

Three-digit prefixes of Carroll 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 Carroll County's
PrefixSectional centerHereAll codes
610 Palatine, IL (SCF 600) 8 66
612 Quad Cities, IL (SCF 612) 2 47

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