Winnebago County, Illinois ZIP Codes
- ZIP records
20 - Cities represented
12 - Sum of listed ZIP population estimates
285,063
Population sum includes positive estimates in these ZIP records; it is not an official county population.
Top ZIP Codes by Population
| Rank | ZIP Code | City | Population estimate |
|---|---|---|---|
| 1 | 61107 | Rockford | 30,765 |
| 2 | 61108 | Rockford | 30,355 |
| 3 | 61109 | Rockford | 26,768 |
| 4 | 61111 | Loves Park | 23,286 |
| 5 | 61103 | Rockford | 22,869 |
| 6 | 61115 | Machesney Park | 22,364 |
| 7 | 61073 | Roscoe | 20,194 |
| 8 | 61101 | Rockford | 19,318 |
| 9 | 61104 | Rockford | 17,222 |
| 10 | 61102 | Rockford | 15,937 |
Cities in Winnebago County
- Cherry Valley
- Durand
- Loves Park
- Machesney Park
- Pecatonica
- Rockford
- Rockton
- Roscoe
- Seward
- Shirland
- South Beloit
- Winnebago
ZIP Directory
- ZIP 61016
- ZIP 61024
- ZIP 61063
- ZIP 61072
- ZIP 61073
- ZIP 61077
- ZIP 61079
- ZIP 61080
- ZIP 61088
- ZIP 61101
- ZIP 61102
- ZIP 61103
- ZIP 61104
- ZIP 61107
- ZIP 61108
- ZIP 61109
- ZIP 61111
- ZIP 61112
- ZIP 61114
- ZIP 61115
Browse all ZIP data for Illinois
Methodology: Records are grouped by the source file's listed county and state. Population sums add positive ZIP-level estimates and are not official county totals; city counts use distinct city labels in the source.