1850 Counties of  Illinois

County Description Area in sq miles Courts held at Pop in 1850
Adams westernmost part on Mississippi river 768 Quincy 26,508
Alexander southern most at junction of Mississippi & Ohio Rivers 390 s Unity 2,484
Boone north boundary, drained by Kishwaukee river 400 Belvidere 7,626
Brown western part, Illinois river on east & Crooked river on northeast 300 Mount Sterling 7,198
Bureau northern part, northwest side of Illinois river, water by Bureau creek & Winnebago lake 648 Princeton 8,841
Calhoun western boundary, between Illinois & Mississipi rivers 240 Gilead 3,231
Carroll western boundary, on east side of Mississippi river 445 Mount Carroll 4,586
Cass western part, on southeast side of Illinois river 256 Virginia 3,253
Champaign eastern part, drained by Kaskaskia, Embarrass, Sangamon & Vermilion rivers 792 Urbana 2,649
Christian central part 350 Edinburgh 3,203
Clark eastern boundary, west side of Wabash river 500 Marshall 9,532
Clay southeast part 475 Lewisville 4,289
Clinton southern part, crossed by Kaskaskia river 480 Carlyle 5,139
Coles eastern part 1,248 Charleston 9,335
Cook eastern boundary, on west side of Lake Michigan & water by DesPlaines, Chicago & Du Page rivers 864 Chicago 43,385
Crawford eastern boundary, Wabash river on east & Embarrass river on southwest 426 Palestine 7,135
Cumberland eastern part blank Greenup 3,720
De Kalb northern part 648 Sycamore 7,450
De Witt central part blank Clinton 5,002
Du Page northeastern part 396 Naperville 9,290
Edgar eastern boundary 630 Paris 10,692
Edwards southeastern part 200 Albion 3,524
Effingham southeastern part 486 Ewington 3,799
Fayette central part, crossed by Kaskaskia river 648 Vandalia 8,075
Franklin southern part 866 Benton 5,681
Fulton western part, Illinois river on southeast side 874 Lewiston 22,508
Gallatin eastern boundary, Ohio & Wabash rivers on east 760 Equality 5,448
Greene western part, Illinois river on west 912 Carrollton 3,658
Grundy northeastern part, crossed by Des Plaines river 324 Morris 3,006
Hamilton south eastern part 432 McLeansborough 6,362
Hancock western boundary, Mississippi river on west 775 Carthage 14,652
Hardin southeastern part, Ohio river on east & south side 100 Elizabethtown 2,887
Henderson western boundary, Mississippi river on west blank Oquawka 4,612
Henry north western part, Rock river on northwest 840 Cambridge 3,807
Highland no description blank Elm Grove blank
Iroquis east boundary, crossed by Iroquis river 1428 Middleport 4,149
Jackson southwest boundary on Mississippi river 576 Brownsville 5,862
Jasper southeast part 475 Newton 3,220
Jefferson southern part 576 Mount Vernon 8,109
Jersey not listed in book as a county   (Jerseyville)  
Jo-Daviess northwest corner on Mississippi river 724 Galena 18,604
Johnson southern part 486 Vienna 4,113
Kane northeast part, crossed by Fox river 1296 Geneva 16,7013
Kendall north eastern part, crossed by Fox river 324 Yorkville 7,730
Knox west part 792 Knoxville 13,279
Lake northeast corner on Lake Michigan 425 Waukegan 14,226
La Salle northern part, crossed by Illinois river 1864 Ottawa 17,815
Lawrence south eastern boundary, Wabash river on southeast 560 Lawrenceville 6,122
Lee north part, crossed  by Rock river 720 Dixon 5,292
Livingston northeast part 1026 Pontiac 1,552
Logan central part 529 Postville 5,128
Macon central part 1400 Decatur 3,988
Macoupin toward western boundary, water by Macoupin river 800 Carlinville 12,355
Madison western boundary on Mississippi river 760 Edwardsville 20,436
Marion toward south part 576 Salem 6,720
Marshall toward north part, crossed by Illinois river 384 Lacon 5,180
Mason central part, Illinois river on northwest, Sangamon river on south blank Bath 5,922
Massac southern boundary, Ohio river on south blank Metropolis 4,092
McDonough western part 576 Macomb 7,615
McHenry northern boundary 960 Dorr 14,979
McLean central part 1296 Bloomington 10,163
Menard central part, crossed by Sangamon river 260 Petersburgh 6,349
Mercer western boundary, Mississippi river on west 550 Millersburgh 5,246
Monroe southwest boundary, Mississippi river on west & Kaskaskia river on east 360 Waterloo 7,679
Montgomery towards southern part 684 Hillsborough 6,276
Morgan western part, Illinois river on west 510 Jacksonville 16,064
Moultrie central part, water by Kaskaskia river not listed not listed 3,234
Ogle northern part, crossed by Rock river 625 Oregon City 10,020
Peoria toward west part, Illinois river on southeast 648 Peoria 17,547
Perry south part 432 Pinckeyville 5,278
Piatt towards east part 440 Monticello 1,606
Pike southwestern boundary, Mississippi river on southwest & Illinois river on east 800 Pittsfield 9,095
Pope on southern boundary, Ohio river on southeast 576 Golconda 3,975
Putnam north part, crossed by Illinois river 325 Hennepin 3,924
Randolph southwestern boundary, Mississippi river on southwest, crossed by Kaskaskia river 540 Kaskaskia 11,079
Richland south eastern part blank Olney 4,012
Rock Island on northwestern boundary on Mississippi river, crossed by Rock river blank Rock Island 6,937
St Clair on south western boundary, Mississippi river on west, crossed by Kaskaskia river 648 Bellville 20,181
Saline southern part blank Raleigh 5,558
Sangnom or Sangamo central part, crossed by Sangamon river 900 Springfield (Capital) 19,228
Schuyler western part, Illinois river on southeast 360 Rushville 10,573
Scott western part, Illinois river on west 240 Winchester 7,914
Shelby central part, crossed by Kaskaskia river 1080 Shelbyville 7,807
Stark toward northwest part, crossed by Spoon river 288 Toulon 3,710
Stephenson on north boundary, crossed by Pekatonica river 500 Freeport 11,666
Tazewell central part, Illinois river on northwest 1130 Tremont 12,052
Union on southwestern boundary, Mississippi river on southwest 380 Jonesboro 7,615
Vermilion on east boundary 1000 Danville 11,492
Wabash on southeastern boundary, Wabash river on southwest 180 Mount Carmel 4,690
Warren in western part 600 Monmouth 8,176
Washington toward southern part, Kaskaskia river on northwest 656 Nashville 6,953
Wayne in southeast part, Little Wabash on east 720 Fairfield 6,828
White on southeastern boundary, Wabash river on east 480 Carmi 8,925
Whitesides on northwest boundary, Mississippi river on west, crossed by Rock river 770 Lyndon 5,361
Will on east boundary, crossed by Des Plaines river 504 Joliet 16,703
Williamson in southern part 432 Marion 7,216
Winnebago northern boundary, crossed by rock river 504 Rockford 11,773
Woodford in central part, Illinois river on northwest 470 Woodford 4,416

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