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City ZIP codes · Illinois

Rockford, IL ZIP Codes

14 ZIP codes use the postal name Rockford, Illinois (Census 2020 ZCTAs and GeoNames postal codes, October 2026): 9 residential and 5 for PO boxes or a single organization. Median household income runs from $33,772 in 61104 to $85,568 in 61114, 2.5 times as much (Census Bureau, ACS 2020-2024). Rockford's most populous ZIP code is 61107, with 30,765 people (ACS 2020-2024); 71% of its land is in the city of Rockford.

  • ACS2020-24
  • Census2020
  • GeoNames2026

Where are Rockford's ZIP codes?

61101: $46k median household income61102: $47k median household income61103: $51k median household income61104: $34k median household income61107: $79k median household income61108: $64k median household income61109: $63k median household income61112: $41k median household income61114: $86k median household income611016110961102611036110761108611146110461101: $46k median household income61102: $47k median household income61103: $51k median household income61104: $34k median household income61107: $79k median household income61108: $64k median household income61109: $63k median household income61112: $41k median household income61114: $86k median household income611016110961102611036110761108611146110461101: $46k median household income61102: $47k median household income61103: $51k median household income61104: $34k median household income61107: $79k median household income61108: $64k median household income61109: $63k median household income61112: $41k median household income61114: $86k median household income6110161109611026110361107611086111461104
The 9 residential ZIP codes named Rockford, shaded by median household income in national fifths (ACS 2020-2024). Select a ZIP to open it. <$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 Rockford's ZIP codes?

The highest median household income is in 61114 ($85,568), the lowest in 61104 ($33,772). Home values run from $90,100 in 61104 to $204,300 in 61114.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013, B25077, B01003).

All 9 residential ZIP codes of Rockford

Residential ZIP codes with the postal name Rockford, IL, largest first (ACS 2020-2024); sort by any column
County
61107 Winnebago County 30,765 2,062 $79k $175k
61108 Winnebago County 30,355 2,781 $64k $145k
61109 Winnebago County 26,768 695 $63k $139k
61103 Winnebago County 22,869 1,400 $51k $116k
61101 Winnebago County 19,318 465 $46k $91k
61104 Winnebago County 17,222 3,827 $34k $90k
61102 Winnebago County 15,937 467 $47k $99k
61114 Winnebago County 15,325 1,882 $86k $204k
61112 Winnebago County 152 193 $41k –

Download the 14 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; 2023 Gazetteer land areas (2020 ZCTAs); town names from simplemaps US ZIP Codes (CC BY 4.0) and GeoNames (CC BY 4.0).

PO Box and single-organization ZIP codes in Rockford

5 ZIP codes named Rockford have no residential delivery area: post office boxes, or one organization (a large employer, an agency, a university) with its own code. The Census Bureau publishes no figures for them.

Rockford, IL: ZIP codes without a residential area, for PO boxes or one organization (GeoNames postal codes; USPS does not publish openly which is which)
ZIPCounty
61105Winnebago County
61106Winnebago County
61110Winnebago County
61125Winnebago County
61126Winnebago County

Source: GeoNames postal codes (CC BY 4.0); a ZIP code with no Census ZCTA has no residential delivery area.

Which counties do Rockford's ZIP codes reach?

Rockford's residential ZIP codes lie in 3 counties: Winnebago County (9 ZIP codes mainly there), Ogle County (part of a ZIP code), Boone County (part of a ZIP code).

Which places do Rockford's ZIP codes cover?

A postal name is not a city limit. By the Census Bureau's places, Rockford's residential ZIP codes cover Rockford itself and 2 other places, each listed with the ZIP codes that have at least 5% of their land in it or hold most of the place:

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

Which first three digits do Rockford'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 Rockford starts with 611.

Three-digit prefixes of Rockford'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 Rockford's
PrefixSectional centerHereAll codes
611 Palatine, IL (SCF 600) 14 19

14 of the 19 ZIP codes that start with 611 are Rockford's, all sorted at Palatine, IL (SCF 600). The other 5 are 61111 (Loves Park), 61115 (Machesney Park), 61130 (Loves Park, PO Box or unique), 61131 (Loves Park, PO Box or unique), 61132 (Loves Park, PO Box or unique).

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