AREA AND POPULATION OF ILLINOIS BY COUNTIES.
| County | Map Index. |
County Seat. | Area in square miles. |
Population. | |
| 1890. | 1900. | ||||
| Adams | A 4 | Quincy | 838 | 61,888 | 67,058 |
| Alexander | E 6 | Cairo | 230 | 16,563 | 19,384 |
| Bond | C 5 | Greenville | 372 | 14,550 | 16,078 |
| Boone | D 1 | Belvidere | 288 | 12,203 | 15,791 |
| Brown | B 4 | Mount Sterling | 306 | 11,951 | 11,557 |
| Bureau | C 2 | Princeton | 877 | 35,014 | 41,112 |
| Calhoun | B 4 | Hardin | 252 | 7,652 | 8,917 |
| Carroll | B 1 | Mount Carroll | 462 | 18,320 | 18,963 |
| Cass | B 4 | Virginia | 388 | 15,963 | 17,222 |
| Champaign | B 3 | Urbana | 1,000 | 42,159 | 47,622 |
| Christian | C 4 | Taylorville | 688 | 30,531 | 32,970 |
| Clark | E 4 | Marshall | 515 | 21,899 | 24,033 |
| Clay | D 5 | Louisville | 468 | 16,772 | 19,553 |
| Clinton | C 5 | Carlyle | 498 | 17,411 | 19,824 |
| Coles | D 4 | Charleston | 520 | 30,093 | 34,146 |
| Cook | E 2 | Chicago | 993 | 1,191,922 | 1,838,735 |
| Crawford | E 5 | Robinson | 450 | 17,283 | 19,240 |
| Cumberland | D 4 | Toledo | 347 | 15,443 | 16,124 |
| Dekalb | D 2 | Sycamore | 646 | 27,066 | 31,756 |
| Dewitt | C 3 | Clinton | 406 | 17,011 | 18,972 |
| Douglas | D 4 | Tuscala | 420 | 17,669 | 19,097 |
| Dupage | D 2 | Wheaton | 347 | 22,551 | 28,196 |
| Edgar | E 4 | Paris | 648 | 26,787 | 28,273 |
| Edwards | D 5 | Albion | 232 | 9,444 | 10,345 |
| Effingham | D 4 | Effingham | 486 | 19,358 | 20,465 |
| Fayette | C 4 | Vandalia | 692 | 23,367 | 28,065 |
| Ford | D 3 | Paxton | 480 | 17,035 | 18,359 |
| Franklin | C 5 | Benton | 436 | 17,138 | 19,675 |
| Fulton | B 3 | Lewistown | 828 | 43,110 | 46,201 |
| Gallatin | D 6 | Shawneetown | 325 | 14,935 | 15,836 |
| Greene | B 4 | Carrollton | 544 | 23,791 | 23,402 |
| Grundy | D 2 | Morris | 432 | 21,024 | 24,136 |
| Hamilton | D 5 | McLeansboro | 438 | 17,800 | 20,197 |
| Hancock | A 3 | Carthage | 765 | 31,907 | 32,215 |
| Hardin | D 6 | Elizabethtown | 194 | 7,234 | 7,448 |
| Henderson | A 3 | Oquawka | 362 | 9,876 | 10,836 |
| Henry | B 2 | Cambridge | 840 | 33,338 | 40,049 |
| Iroquois | E 3 | Watseka | 123 | 35,167 | 38,014 |
| Jackson | C 6 | Murphysboro | 558 | 27,809 | 33,871 |
| Jasper | D 4 | Newton | 503 | 18,188 | 20,160 |
| Jefferson | C 5 | Mount Vernon | 590 | 22,590 | 28,133 |
| Jersey | B 4 | Jerseyville | 360 | 14,810 | 14,612 |
| Jo Daviess | B 1 | Galena | 656 | 25,101 | 24,533 |
| Johnson | D 6 | Vienna | 340 | 15,013 | 15,667 |
| Kane | D 2 | Geneva | 540 | 65,061 | 78,792 |
| Kankakee | E 2 | Kankakee | 692 | 28,732 | 37,154 |
| Kendall | D 2 | Yorkville | 324 | 12,106 | 11,467 |
| Knox | B 3 | Galesburg | 720 | 38,752 | 43,612 |
