| 2000 Census Data | Black | Asian | Hispanic | ||||||
| County | 1990 Pop. | 2000 Pop. | Difference | % Dif. | Black Pop. | % Black | Asian Pop. | Hisp. Pop. | % Hisp. |
| 11,430,602 | 12,419,293 | 988,691 | 8.6% | 1,937,671 | 15.6% | 473,649 | 1,530,262 | 12.3% | |
| Adams | 66,090 | 68,277 | 2,187 | 3.3% | 2,423 | 3.5% | 360 | 567 | 0.8% |
| Alexander | 10,626 | 9,590 | -1,036 | -9.7% | 3,391 | 35.4% | 44 | 138 | 1.4% |
| Bond | 14,991 | 17,633 | 2,642 | 17.6% | 1,334 | 7.6% | 64 | 253 | 1.4% |
| Boone | 30,806 | 41,786 | 10,980 | 35.6% | 482 | 1.2% | 333 | 5,219 | 12.5% |
| Brown | 5,836 | 6,950 | 1,114 | 19.1% | 1,270 | 18.3% | 22 | 273 | 3.9% |
| Bureau | 35,688 | 35,503 | -185 | -0.5% | 181 | 0.5% | 229 | 1,732 | 4.9% |
| Calhoun | 5,322 | 5,084 | -238 | -4.5% | 3 | 0.1% | 10 | 32 | 0.6% |
| Carroll | 16,805 | 16,674 | -131 | -0.8% | 117 | 0.7% | 101 | 340 | 2.0% |
| Cass | 13,437 | 13,695 | 258 | 1.9% | 75 | 0.5% | 55 | 1,162 | 8.5% |
| Champaign | 173,025 | 179,669 | 6,644 | 3.8% | 21,489 | 12.0% | 12,749 | 5,203 | 2.9% |
| Christian | 34,418 | 35,372 | 954 | 2.8% | 805 | 2.3% | 154 | 345 | 1.0% |
| Clark | 15,921 | 17,008 | 1,087 | 6.8% | 60 | 0.4% | 36 | 54 | 0.3% |
| Clay | 14,460 | 14,560 | 100 | 0.7% | 27 | 0.2% | 80 | 88 | 0.6% |
| Clinton | 33,944 | 35,535 | 1,591 | 4.7% | 1,435 | 4.0% | 176 | 570 | 1.6% |
| Coles | 51,644 | 53,196 | 1,552 | 3.0% | 1,386 | 2.6% | 517 | 737 | 1.4% |
| Cook | 5,105,067 | 5,376,741 | 271,674 | 5.3% | 1,435,781 | 26.7% | 287,551 | 1,071,740 | 19.9% |
| Crawford | 19,464 | 20,452 | 988 | 5.1% | 975 | 4.8% | 104 | 351 | 1.7% |
| Cumberland | 10,670 | 11,253 | 583 | 5.5% | 18 | 0.2% | 29 | 68 | 0.6% |
| DeKalb | 77,932 | 88,969 | 11,037 | 14.2% | 4,466 | 5.0% | 2,378 | 5,830 | 6.6% |
| De Witt | 16,516 | 16,798 | 282 | 1.7% | 115 | 0.7% | 75 | 213 | 1.3% |
| Douglas | 19,464 | 19,922 | 458 | 2.4% | 84 | 0.4% | 72 | 690 | 3.5% |
| DuPage | 781,666 | 904,161 | 122,495 | 15.7% | 30,390 | 3.4% | 76,941 | 81,366 | 9.0% |
| Edgar | 19,595 | 19,704 | 109 | 0.6% | 378 | 1.9% | 48 | 154 | 0.8% |
| Edwards | 7,440 | 6,971 | -469 | -6.3% | 13 | 0.2% | 32 | 32 | 0.5% |
| Effingham | 31,704 | 34,264 | 2,560 | 8.1% | 82 | 0.2% | 138 | 252 | 0.7% |
| Fayette | 20,893 | 21,802 | 909 | 4.4% | 1,081 | 5.0% | 62 | 174 | 0.8% |
| Ford | 14,275 | 14,241 | -34 | -0.2% | 55 | 0.4% | 63 | 176 | 1.2% |
| Franklin | 40,319 | 39,018 | -1,301 | -3.2% | 81 | 0.2% | 121 | 249 | 0.6% |
| Fulton | 38,080 | 38,250 | 170 | 0.4% | 1,427 | 3.7% | 126 | 478 | 1.2% |
| Gallatin | 6,909 | 6,445 | -464 | -6.7% | 24 | 0.4% | 10 | 56 | 0.9% |
| Greene | 15,317 | 14,761 | -556 | -3.6% | 128 | 0.9% | 31 | 77 | 0.5% |
| Grundy | 32,337 | 37,535 | 5,198 | 16.1% | 114 | 0.3% | 173 | 1,552 | 4.1% |
| Hamilton | 8,499 | 8,621 | 122 | 1.4% | 65 | 0.8% | 32 | 55 | 0.6% |
| Hancock | 21,373 | 20,121 | -1,252 | -5.9% | 66 | 0.3% | 60 | 105 | 0.5% |
| Hardin | 5,189 | 4,800 | -389 | -7.5% | 141 | 2.9% | 27 | 51 | 1.1% |
| Henderson | 8,096 | 8,213 | 117 | 1.4% | 34 | 0.4% | 12 | 72 | 0.9% |
| Henry | 51,159 | 51,020 | -139 | -0.3% | 751 | 1.5% | 180 | 1,467 | 2.9% |
| Iroquois | 30,787 | 31,334 | 547 | 1.8% | 265 | 0.8% | 117 | 1,217 | 3.9% |
| Jackson | 61,067 | 59,612 | -1,455 | -2.4% | 8,169 | 13.7% | 2,054 | 1,443 | 2.4% |
| Jasper | 10,609 | 10,117 | -492 | -4.6% | 11 | 0.1% | 26 | 48 | 0.5% |
| Jefferson | 37,020 | 40,045 | 3,025 | 8.2% | 3,302 | 8.2% | 267 | 531 | 1.3% |
| Jersey | 20,539 | 21,668 | 1,129 | 5.5% | 141 | 0.7% | 77 | 162 | 0.7% |
| Jo Daviess | 21,821 | 22,289 | 468 | 2.1% | 64 | 0.3% | 56 | 342 | 1.5% |
| Johnson | 11,347 | 12,878 | 1,531 | 13.5% | 1,840 | 14.3% | 36 | 368 | 2.9% |
| Kane | 317,471 | 404,119 | 86,648 | 27.3% | 25,503 | 6.3% | 8,745 | 95,924 | 23.7% |
| Kankakee | 96,255 | 103,833 | 7,578 | 7.9% | 16,651 | 16.0% | 949 | 4,959 | 4.8% |
| Kendall | 39,413 | 54,544 | 15,131 | 38.4% | 879 | 1.6% | 611 | 4,086 | 7.5% |
| Knox | 56,393 | 55,836 | -557 | -1.0% | 3,904 | 7.0% | 460 | 1,896 | 3.4% |
| Lake | 516,418 | 644,356 | 127,938 | 24.8% | 48,015 | 7.5% | 28,615 | 92,716 | 14.4% |
| La Salle | 106,913 | 111,509 | 4,596 | 4.3% | 2,000 | 1.8% | 784 | 5,791 | 5.2% |
| Lawrence | 15,972 | 15,452 | -520 | -3.3% | 155 | 1.0% | 24 | 137 | 0.9% |
| Lee | 34,392 | 36,062 | 1,670 | 4.9% | 1,887 | 5.2% | 272 | 1,147 | 3.2% |
| Livingston | 39,301 | 39,678 | 377 | 1.0% | 2,122 | 5.3% | 184 | 1,056 | 2.7% |
| Logan | 30,798 | 31,183 | 385 | 1.3% | 2,113 | 6.8% | 211 | 503 | 1.6% |
| McDonough | 35,244 | 32,913 | -2,331 | -6.6% | 1,247 | 3.8% | 745 | 488 | 1.5% |
| McHenry | 183,241 | 260,077 | 76,836 | 41.9% | 2,040 | 0.8% | 4,550 | 19,602 | 7.5% |
| McLean | 129,180 | 150,433 | 21,253 | 16.5% | 10,261 | 6.8% | 3,527 | 3,833 | 2.5% |
| Macon | 117,206 | 114,706 | -2,500 | -2.1% | 17,106 | 14.9% | 859 | 1,120 | 1.0% |
| Macoupin | 47,679 | 49,019 | 1,340 | 2.8% | 457 | 0.9% | 143 | 305 | 0.6% |
| Madison | 249,238 | 258,941 | 9,703 | 3.9% | 19,896 | 7.7% | 2,125 | 3,925 | 1.5% |
| Marion | 41,561 | 41,691 | 130 | 0.3% | 1,790 | 4.3% | 291 | 378 | 0.9% |
| Marshall | 12,846 | 13,180 | 334 | 2.6% | 68 | 0.5% | 49 | 138 | 1.0% |
| Mason | 16,269 | 16,038 | -231 | -1.4% | 28 | 0.2% | 49 | 80 | 0.5% |
| Massac | 14,752 | 15,161 | 409 | 2.8% | 910 | 6.0% | 60 | 123 | 0.8% |
| Menard | 11,164 | 12,486 | 1,322 | 11.8% | 59 | 0.5% | 32 | 94 | 0.8% |
| Mercer | 17,290 | 16,957 | -333 | -1.9% | 71 | 0.4% | 56 | 216 | 1.3% |
| Monroe | 22,422 | 27,619 | 5,197 | 23.2% | 29 | 0.1% | 116 | 203 | 0.7% |
| Montgomery | 30,728 | 30,652 | -76 | -0.2% | 1,173 | 3.8% | 103 | 326 | 1.1% |
| Morgan | 36,397 | 36,616 | 219 | 0.6% | 2,123 | 5.8% | 225 | 496 | 1.4% |
| Moultrie | 13,930 | 14,287 | 357 | 2.6% | 39 | 0.3% | 23 | 68 | 0.5% |
| Ogle | 45,957 | 51,032 | 5,075 | 11.0% | 349 | 0.7% | 312 | 3,066 | 6.0% |
| Peoria | 182,827 | 183,433 | 606 | 0.3% | 31,327 | 17.1% | 3,499 | 3,827 | 2.1% |
| Perry | 21,412 | 23,094 | 1,682 | 7.9% | 1,913 | 8.3% | 92 | 406 | 1.8% |
| Piatt | 15,548 | 16,365 | 817 | 5.3% | 57 | 0.3% | 34 | 101 | 0.6% |
| Pike | 17,577 | 17,384 | -193 | -1.1% | 275 | 1.6% | 62 | 87 | 0.5% |
| Pope | 4,373 | 4,413 | 40 | 0.9% | 182 | 4.1% | 16 | 40 | 0.9% |
| Pulaski | 7,523 | 7,348 | -175 | -2.3% | 2,328 | 31.7% | 73 | 107 | 1.5% |
| Putnam | 5,730 | 6,086 | 356 | 6.2% | 53 | 0.9% | 19 | 171 | 2.8% |
| Randolph | 34,583 | 33,893 | -690 | -2.0% | 3,238 | 9.6% | 122 | 521 | 1.5% |
| Richland | 16,545 | 16,149 | -396 | -2.4% | 67 | 0.4% | 123 | 124 | 0.8% |
| Rock Island | 148,723 | 149,374 | 651 | 0.4% | 12,419 | 8.3% | 1,881 | 12,791 | 8.6% |
| St. Clair | 262,852 | 256,082 | -6,770 | -2.6% | 74,995 | 29.3% | 3,259 | 5,604 | 2.2% |
| Saline | 26,551 | 26,733 | 182 | 0.7% | 1,193 | 4.5% | 83 | 258 | 1.0% |
| Sangamon | 178,386 | 188,951 | 10,565 | 5.9% | 19,426 | 10.3% | 2,521 | 2,000 | 1.1% |
| Schuyler | 7,498 | 7,189 | -309 | -4.1% | 17 | 0.2% | 11 | 39 | 0.5% |
| Scott | 5,644 | 5,537 | -107 | -1.9% | 3 | 0.1% | 7 | 10 | 0.2% |
| Shelby | 22,261 | 22,893 | 632 | 2.8% | 43 | 0.2% | 70 | 110 | 0.5% |
| Stark | 6,534 | 6,332 | -202 | -3.1% | 6 | 0.1% | 20 | 54 | 0.9% |
| Stephenson | 48,052 | 48,979 | 927 | 1.9% | 4,168 | 8.5% | 452 | 747 | 1.5% |
| Tazewell | 123,692 | 128,485 | 4,793 | 3.9% | 1,328 | 1.0% | 823 | 1,331 | 1.0% |
| Union | 17,619 | 18,293 | 674 | 3.8% | 179 | 1.0% | 75 | 481 | 2.6% |
| Vermilion | 88,257 | 83,919 | -4,338 | -4.9% | 9,361 | 11.2% | 601 | 2,504 | 3.0% |
| Wabash | 13,111 | 12,937 | -174 | -1.3% | 83 | 0.6% | 77 | 95 | 0.7% |
| Warren | 19,181 | 18,735 | -446 | -2.3% | 386 | 2.1% | 89 | 507 | 2.7% |
| Washington | 14,965 | 15,148 | 183 | 1.2% | 65 | 0.4% | 42 | 108 | 0.7% |
| Wayne | 17,241 | 17,151 | -90 | -0.5% | 46 | 0.3% | 75 | 103 | 0.6% |
| White | 16,522 | 15,371 | -1,151 | -7.0% | 54 | 0.4% | 49 | 103 | 0.7% |
| Whiteside | 60,186 | 60,653 | 467 | 0.8% | 833 | 1.4% | 340 | 5,347 | 8.8% |
| Will | 357,313 | 502,266 | 144,953 | 40.6% | 55,060 | 11.0% | 13,008 | 43,768 | 8.7% |
| Williamson | 57,733 | 61,296 | 3,563 | 6.2% | 1,742 | 2.8% | 401 | 763 | 1.2% |
| Winnebago | 252,913 | 278,418 | 25,505 | 10.1% | 31,264 | 11.2% | 5,628 | 19,206 | 6.9% |
| Woodford | 32,653 | 35,469 | 2,816 | 8.6% | 146 | 0.4% | 149 | 241 | 0.7% |