| ZIP Codes: | 28 ZIP Codes (18 Standard, 10 PO Box, 0 Unique) [See All] |
| Area Codes: | 779 / 815 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:04 PM |
| Population: | 285,063 [See All] |
| FIPS: | 17201 |
| CBSA: | Rockford, IL |
| Land Area: | 532 sq mi |
| Water Area: | 6 sq mi |
| Coordinates: | 42.3071, -89.0877 |
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285,063 residents live across 28 ZIPs covering 532 sq mi, served by 12 distinct USPS-recognized cities.
Population moved from 293,136 to 285,063 from 2014 to 2024 — a -2.8% change. 11 ZIPs gained residents, 9 lost.
The county's wealthiest ZIP 61072 (Rockton, $104,938 median) and poorest ZIP 61104 (Rockford, $33,772) are 11.8 miles apart — a 3.1× income gap across local geography.
Median home values vary 2.7× across this county — from $90,100 in 61104 (Rockford) to $239,100 in 61073 (Roscoe).
Density varies 102× across the county — from 37 people/sq mi in 61024 (Durand) to 3,740 in 61104 (Rockford).
Educational attainment ranges from 9.3% bachelor's+ in 61104 (Rockford) to 46.1% in 61114 (Rockford) — the breadth of educational profiles across the area.
Within Illinois, this is the #7 most populous of 102 counties and ranks #62 for median household income .
Weighted by population, the typical household earns about $68,575 across the county — reflecting what a typical resident sees, not a simple ZIP average.
25.3% of adults age 25+ hold a bachelor's degree or higher (49,264 of 194,379 reporting). The most-educated ZIPs cluster around Rockford.
18 Standard delivery, 10 PO Box only, 0 single-entity Unique ZIPs serve this county.
Median household income spans 3.1× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 61107 | Rockford | Standard | 30,765 | $78,574 | 15.0 | 0.8% |
| 61108 | Rockford | Standard | 30,355 | $64,415 | 10.9 | 4.2% |
| 61109 | Rockford | Standard | 26,768 | $62,973 | 39.4 | -4.1% |
| 61111 | Loves Park | Standard | 23,286 | $61,393 | 13.3 | -4.9% |
| 61103 | Rockford | Standard | 22,869 | $51,161 | 17.1 | -6.0% |
| 61115 | Machesney Park | Standard | 22,364 | $75,363 | 12.6 | -3.2% |
| 61073 | Roscoe | Standard | 20,194 | $102,064 | 28.2 | 3.1% |
| 61101 | Rockford | Standard | 19,318 | $46,163 | 40.6 | -13.3% |
| 61104 | Rockford | Standard | 17,222 | $33,772 | 4.6 | -7.9% |
| 61102 | Rockford | Standard | 15,937 | $46,599 | 34.8 | -17.1% |
| 61114 | Rockford | Standard | 15,325 | $85,568 | 8.1 | 5.0% |
| 61072 | Rockton | Standard | 11,285 | $104,938 | 59.5 | -1.3% |
| 61080 | South Beloit | Standard | 10,955 | $76,579 | 25.6 | 0.3% |
| 61088 | Winnebago | Standard | 6,167 | $98,088 | 50.0 | 5.1% |
| 61016 | Cherry Valley | Standard | 5,465 | $84,883 | 29.5 | 28.1% |
| 61063 | Pecatonica | Standard | 4,011 | $84,276 | 78.2 | -5.6% |
| 61024 | Durand | Standard | 2,318 | $70,750 | 63.1 | 2.0% |
| 61079 | Shirland | PO Box | 210 | $46,367 | 0.4 | 34.6% |
| 61112 | Rockford | Standard | 152 | $40,563 | 0.8 | 52.0% |
| 61077 | Seward | PO Box | 97 | — | 0.0 | 234.5% |
| 61125 | Rockford | PO Box | — | — | 0.0 | — |
| 61126 | Rockford | PO Box | — | — | 0.0 | — |
| 61131 | Loves Park | PO Box | — | — | 0.0 | — |
| 61130 | Loves Park | PO Box | — | — | 0.0 | — |
| 61132 | Loves Park | PO Box | — | — | 0.0 | — |
| 61106 | Rockford | PO Box | — | — | 0.0 | — |
| 61105 | Rockford | PO Box | — | — | 0.0 | — |
| 61110 | Rockford | PO Box | — | — | 0.0 | — |