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Illinois counties
102 counties in Illinois, sorted by population. Every county's ZIPs are included in the Illinois CSV — $7.
| County | ZIP codes | Population | Median HH income | |
|---|---|---|---|---|
| Cook | 177 | 5.5M | $91,134 | View → |
| DuPage | 43 | 1.2M | $117,585 | View → |
| Will | 45 | 1M | $111,722 | View → |
| Lake | 35 | 881.2K | $118,057 | View → |
| Kane | 33 | 807.4K | $113,599 | View → |
| McHenry | 24 | 424.3K | $111,652 | View → |
| Kendall | 19 | 417.1K | $108,354 | View → |
| St. Clair | 34 | 339.6K | $80,115 | View → |
| Madison | 36 | 305K | $78,764 | View → |
| Winnebago | 25 | 299.2K | $69,719 | View → |
| Champaign | 35 | 223.5K | $66,158 | View → |
| Sangamon | 30 | 206.4K | $78,863 | View → |
| McLean | 33 | 195.4K | $79,766 | View → |
| Peoria | 28 | 185K | $70,526 | View → |
| Boone | 15 | 181.5K | $81,504 | View → |
| DeKalb | 22 | 167.8K | $81,922 | View → |
| Rock Island | 21 | 151.4K | $70,381 | View → |
| Tazewell | 21 | 147.8K | $80,152 | View → |
| Kankakee | 21 | 135.1K | $76,486 | View → |
| LaSalle | 29 | 125.9K | $75,769 | View → |
| Ogle | 26 | 124.5K | $70,510 | View → |
| Williamson | 22 | 118.1K | $59,445 | View → |
| Macon | 27 | 114.9K | $64,968 | View → |
| Lee | 24 | 103.4K | $68,700 | View → |
| Macoupin | 28 | 93.1K | $68,985 | View → |
| Grundy | 16 | 91.9K | $91,298 | View → |
| Jackson | 21 | 78.2K | $54,105 | View → |
| Vermilion | 27 | 76.3K | $59,754 | View → |
| Clinton | 17 | 75.5K | $79,425 | View → |
| Whiteside | 15 | 73.2K | $72,081 | View → |
| Coles | 15 | 71.7K | $63,239 | View → |
| Adams | 23 | 71.2K | $65,782 | View → |
| Bureau | 31 | 70.7K | $66,522 | View → |
| Woodford | 16 | 65.3K | $90,597 | View → |
| Henry | 24 | 63.8K | $75,856 | View → |
| Knox | 23 | 60.2K | $60,791 | View → |
| Livingston | 29 | 59.9K | $68,822 | View → |
| Jefferson | 17 | 59.7K | $59,760 | View → |
| Shelby | 22 | 59.4K | $72,930 | View → |
| Montgomery | 28 | 57.1K | $66,310 | View → |
| Stephenson | 19 | 53.8K | $67,849 | View → |
| Warren | 14 | 52.6K | $57,082 | View → |
| Christian | 20 | 51.7K | $72,783 | View → |
| Marion | 15 | 47K | $61,386 | View → |
| Monroe | 10 | 45.7K | $96,041 | View → |
| Morgan | 16 | 44.9K | $67,304 | View → |
| Effingham | 14 | 44.6K | $77,097 | View → |
| Fulton | 24 | 41.7K | $62,037 | View → |
| Jersey | 11 | 41.1K | $86,054 | View → |
| Cumberland | 11 | 40.9K | $66,919 | View → |
| Iroquois | 28 | 40.6K | $68,283 | View → |
| Franklin | 18 | 40.4K | $57,329 | View → |
| Fayette | 20 | 38.3K | $63,149 | View → |
| Bond | 12 | 37.6K | $79,887 | View → |
| Randolph | 17 | 37.5K | $71,602 | View → |
| Washington | 13 | 37.1K | $63,248 | View → |
| Wayne | 20 | 37K | $58,879 | View → |
| Piatt | 16 | 36.7K | $99,536 | View → |
| Logan | 20 | 35.7K | $73,890 | View → |
| Scott | 9 | 35K | $65,498 | View → |
| Jo Daviess | 15 | 34.5K | $70,557 | View → |
| Clark | 11 | 31.8K | $66,072 | View → |
| Pope | 10 | 31.5K | $60,207 | View → |
| McDonough | 17 | 31.4K | $55,284 | View → |
| Perry | 12 | 31.3K | $66,585 | View → |
| Marshall | 19 | 31.3K | $75,667 | View → |
| Saline | 11 | 30.3K | $55,155 | View → |
| Mercer | 17 | 29.4K | $77,132 | View → |
| Carroll | 10 | 28.6K | $69,534 | View → |
| Edgar | 15 | 28.6K | $65,381 | View → |
| Clay | 13 | 28.3K | $66,371 | View → |
| De Witt | 13 | 28.1K | $82,044 | View → |
| Union | 13 | 28K | $60,136 | View → |
| Stark | 10 | 26.5K | $62,200 | View → |
| Richland | 9 | 26.3K | $66,994 | View → |
| Crawford | 11 | 26.1K | $72,302 | View → |
| Greene | 13 | 26K | $70,632 | View → |
| Hamilton | 13 | 25.6K | $57,422 | View → |
| Douglas | 13 | 25.4K | $78,704 | View → |
| Jasper | 15 | 24.3K | $73,920 | View → |
| Hancock | 20 | 24.1K | $66,861 | View → |
| Henderson | 17 | 22.8K | $63,931 | View → |
| Ford | 21 | 22.7K | $68,793 | View → |
| Moultrie | 9 | 21.5K | $74,558 | View → |
| Pike | 16 | 20.1K | $61,759 | View → |
| Cass | 8 | 19.9K | $73,147 | View → |
| Lawrence | 7 | 18.4K | $62,516 | View → |
| Massac | 8 | 18.3K | $63,491 | View → |
| Johnson | 10 | 17.2K | $65,204 | View → |
| Menard | 8 | 16.5K | $89,440 | View → |
| Mason | 11 | 16K | $66,471 | View → |
| White | 11 | 15.9K | $56,034 | View → |
| Schuyler | 12 | 15.4K | $62,162 | View → |
| Gallatin | 9 | 14.9K | $55,833 | View → |
| Wabash | 7 | 13.7K | $59,733 | View → |
| Alexander | 8 | 8.3K | $56,026 | View → |
| Pulaski | 10 | 8.1K | $54,190 | View → |
| Brown | 5 | 7.7K | $70,305 | View → |
| Edwards | 6 | 7.6K | $60,542 | View → |
| Putnam | 8 | 6.4K | $78,907 | View → |
| Hardin | 5 | 6.2K | $56,387 | View → |
| Calhoun | 7 | 5K | $91,016 | View → |