County ProfileIL
Rock Island County
Population: 144,672 · 21 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
144,672
People
Median age
40.3
Housing
Total households
61,733
Income
Median household income
$67,159
Housing
Total housing units
66,759
Employment
Employment rate
57.6%
Education
Bachelor’s degree or higher
24.7%
Healthcare
Insured population
93.9%
County details
Local time 01:51:05(CT)| Name | Rock Island |
|---|---|
| Total ZIP codes | 21total |
| ZIP codes (by type) | 15 Standard5 PO Box1 Unique |
| Area code | 309, 861 |
| Timezone | Central Time (CT) |
| Coordinates | 41.4684205, -90.5721252 |
| Land area | 427.5 sq miles(1,107.2 km²) |
Map of Rock Island county, Illinois with ZIP codes
Cities and Communities in Rock Island County
Compare the largest cities in Rock Island County by population, median income, and growth. Use the table below to analyze key demographic shifts across the region.
| City | Population | Median incomeHousehold | ZIP codes |
|---|---|---|---|
| Moline | 42,985 | $67,701 | 2ZIPs |
| Rock Island | 37,108 | $59,041 | 3ZIPs |
| East Moline | 21,374 | $61,779 | 1ZIPs |
| Silvis | 8,003 | $62,375 | 1ZIPs |
| Milan | 5,097 | $62,597 | 1ZIPs |
| Coal Valley | 3,873 | $106,850 | 1ZIPs |
| Carbon Cliff | 1,846 | $55,536 | 1ZIPs |
| Hampton | 1,779 | $90,406 | 1ZIPs |
| Port Byron | 1,668 | $111,667 | 1ZIPs |
| Andalusia | 1,184 | $77,222 | 1ZIPs |
| Rapids City | 964 | $83,125 | 1ZIPs |
| Cordova | 671 | $84,167 | 1ZIPs |
| Reynolds | 498 | $76,458 | 1ZIPs |
| Hillsdale | 417 | $86,250 | 1ZIPs |
| Illinois City | 159 | — | 1ZIPs |
| Taylor Ridge | 141 | — | 1ZIPs |
| Barstow | 89 | $77,813 | 1ZIPs |
| Buffalo Prairie | 64 | — | 1ZIPs |
— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.
ZIP Codes in Rock Island County
Review the most populated postal areas across Rock Island County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
| ZIP | City | Median incomeHousehold | Population (ZIP) |
|---|---|---|---|
| 61265 | Moline | $66,933 | 44,342 |
| 61201 | Rock Island | $59,396 | 37,366 |
| 61244 | East Moline | $63,819 | 24,004 |
| 61264 | Milan | $78,068 | 10,157 |
| 61282 | Silvis | $64,398 | 8,278 |
| 61240 | Coal Valley | $113,220 | 5,902 |
| 61275 | Port Byron | $108,438 | 4,154 |
| 61284 | Taylor Ridge | $100,505 | 2,298 |
| 61256 | Hampton | $90,406 | 1,779 |
| 61232 | Andalusia | $73,971 | 1,335 |
| 61259 | Illinois City | $91,458 | 1,197 |
| 61242 | Cordova | $104,219 | 1,121 |
| 61257 | Hillsdale | $64,107 | 1,097 |
| 61239 | Carbon Cliff | $32,177 | 1,024 |
| 61279 | Reynolds | $87,656 | 1,000 |
| 61278 | Rapids City | $69,938 | 697 |
| 61236 | Barstow | $77,813 | 89 |
| 61237 | Buffalo Prairie | — | 22 |
| 61204 | Rock Island | — | — |
| 61266 | Moline | — | — |
Data Sources & Citations
The geographic and demographic information presented on this site is compiled from publicly available, authoritative sources, including:
- United States Census BureauDemographic, population, housing, and socioeconomic data sourced from Census Bureau datasets, including the Decennial Census and the American Community Survey (ACS).Census Data
- United States Postal Service (USPS)ZIP code classifications, delivery types, and postal designations used for reference purposes. USPS ZIP codes are intended for mail delivery and may not always align exactly with Census geographic boundaries.USPS