Alphabetical list of all Illinois (IL) counties, printable, size, seats

Find out the alphabetical list of all Illinois counties, print it, and note the size and seats.

The state of Illinois has one of the highest numbers of counties in the United States, with over 102. Cook County is the most populous in the state, with McLean County as the largest by land area.

Alphabetical list of counties in Illinois

Adams County, IL

Alexander County, IL

Bond County, IL

Boone County, IL

Brown County, IL

Bureau County, IL

Calhoun County, IL

Carroll County, IL

Cass County, IL

Champaign County, IL

Christian County, IL

Clark County, IL

Clay County, IL

Clinton County, IL

Coles County, IL

Cook County, IL

Crawford County, IL

Cumberland County, IL

DeKalb County, IL

DeWitt County, IL

Douglas County, IL

DuPage County, IL

Edgar County, IL

Edwards County, IL

Effingham County, IL

Fayette County, IL

Ford County, IL

Franklin County, IL

Fulton County, IL

Gallatin County, IL

Greene County, IL

Grundy County, IL

Hamilton County, IL

Hancock County, IL

Hardin County, IL

Henderson County, IL

Henry County, IL

Iroquois County, IL

Jackson County, IL

Jasper County, IL

Jefferson County, IL

Jersey County, IL

Jo Daviess County, IL

Johnson County, IL

Kane County, IL

Kankakee County, IL

Kendall County, IL

Knox County, IL

LaSalle County, IL

Lake County, IL

Lawrence County, IL

Lee County, IL

Livingston County, IL

Logan County, IL

Macon County, IL

Macoupin County, IL

Madison County, IL

Marion County, IL

Marshall County, IL

Mason County, IL

Massac County, IL

McDonough County, IL

McHenry County, IL

McLean County, IL

Menard County, IL

Mercer County, IL

Monroe County, IL

Montgomery County, IL

Morgan County, IL

Moultrie County, IL

Ogle County, IL

Peoria County, IL

Perry County, IL

Piatt County, IL

Pike County, IL

Pope County, IL

Pulaski County, IL

Putnam County, IL

Randolph County, IL

Richland County, IL

Rock Island County, IL

Saint Clair County, IL

Saline County, IL

Sangamon County, IL

Schuyler County, IL

Scott County, IL

Shelby County, IL

Stark County, IL

Stephenson County, IL

Tazewell County, IL

Union County, IL

Vermilion County, IL

Wabash County, IL

Warren County, IL

Washington County, IL

Wayne County, IL

White County, IL

Whiteside County, IL

Will County, IL

Williamson County, IL

Winnebago County, IL

Woodford County, IL

List of Idaho counties in printable and scannable

Adams County, IL

Alexander County, IL

Bond County, IL, Boone County, IL, Brown County, IL, Bureau County, IL, Calhoun County, IL, Carroll County, IL, Cass County, IL, Champaign County, IL

Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Cook County, IL, Crawford County, IL, and Cumberland County, IL

DeKalb County, IL; DeWitt County, IL; Douglas County, IL; DuPage County, IL

Edgar County, IL, Edwards County, IL, Effingham County, IL

Fayette County, IL; Ford County, IL; Franklin County, IL; Fulton County, IL

Gallatin County, IL; Greene County, IL; Grundy County, IL

Hamilton County, IL; Hancock County, IL; Hardin County, IL; Henderson County, IL; Henry County, IL

Iroquois County, IL

Jackson County, IL; Jasper County, IL; Jefferson County, IL; Jersey County, IL; Jo Daviess County, IL; Johnson County, IL

Kane County, IL; Kankakee County, IL; Kendall County, IL; Knox County, IL

LaSalle County, IL, Lake County, IL, Lawrence County, IL, Lee County, IL, Livingston County, IL, Logan County, IL

Macon County, IL; Macoupin County, IL; Madison County, IL; Marion County, IL; Marshall County, IL; Mason County, IL; Massac County, IL; McDonough County, IL; McHenry County, IL; McLean County, IL; Menard County, IL; Mercer County, IL; Monroe County, IL; Montgomery County, IL; Morgan County, IL; Moultrie County, IL

Ogle County, IL

Peoria County, IL; Perry County, IL; Piatt County, IL; Pike County, IL; Pope County, IL; Pulaski County, IL; Putnam County, IL

Randolph County, IL; Richland County, IL; Rock Island County, IL; Saint Clair County, IL; Saline County, IL; Sangamon County, IL; Schuyler County, IL; Scott County, IL; Shelby County, IL; Stark County, IL;945 Stephenson County, IL

Tazewell County, IL

Union County, IL

Vermilion County, IL

Wabash County, IL, Warren County, IL, Washington County, IL, Wayne County, IL, White County, IL, Whiteside County, IL, Will County, IL, Williamson County, IL, Winnebago County, IL, Woodford County, IL

List of Illinois counties and their size

Adams County (857 sq mi)

Alexander County (236 sq mi)

Bond County (380 sq mi)

Boone County (281 sq mi)

Brown County (306 sq mi)

Bureau County (873 sq mi)

Calhoun County (284 sq mi)

Carroll County (466 sq mi)

Cass County (376 sq mi)

Champaign County (998 sq mi)

Christian County (716 sq mi)

Clark County (501 sq mi)

Clay County (470 sq mi)

Clinton County (503 sq mi)

Coles County (510 sq mi)

Cook County (945 sq mi)

Crawford County (445 sq mi)

Cumberland County (347 sq mi)

DeKalb County (635 sq mi)

DeWitt County (405 sq mi)

Douglas County (417 sq mi)

DuPage County (336 sq mi)

Edgar County (623 sq mi)

Edwards County (222 sq mi)

Effingham County (479 sq mi)

Fayette County (721 sq mi)

Ford County (486 sq mi)

Franklin County (431 sq mi)

Fulton County (866 sq mi)

Gallatin County (328 sq mi)

Greene County (543 sq mi)

Grundy County (430 sq mi)

Hamilton County (435 sq mi)

Hancock County (794 sq mi)

Hardin County (182 sq mi)

Henderson County (379 sq mi)

Henry County (823 sq mi)

Iroquois County (1,117 sq mi)

Jackson County (602 sq mi)

Jasper County (498 sq mi)

Jefferson County (584 sq mi)

Jersey County (377 sq mi)

Jo Daviess County (618 sq mi)

Johnson County (349 sq mi)

Kane County (524 sq mi)

Kankakee County (681 sq mi)

Kendall County (322 sq mi)

Knox County (716 sq mi)

Lake County (444 sq mi)

LaSalle County (1,135 sq mi)

Lawrence County (374 sq mi)

Lee County (729 sq mi)

Livingston County (1,044 sq mi)

Logan County (618 sq mi)

Macon County (581 sq mi)

Macoupin County (868 sq mi)

Madison County (741 sq mi)

Marion County (576 sq mi)

Marshall County (398 sq mi)

Mason County (563 sq mi)

Massac County (241 sq mi)

McDonough County (590 sq mi)

McHenry County (611 sq mi)

McLean County (1,186 sq mi)

Menard County (314 sq mi)

Mercer County (569 sq mi)

Monroe County (398 sq mi)

Montgomery County (704 sq mi)

Morgan County (569 sq mi)

Moultrie County (336 sq mi)

Ogle County (763 sq mi)

Peoria County (629 sq mi)

Perry County (447 sq mi)

Piatt County (439 sq mi)

Pike County (831 sq mi)

Pope County (374 sq mi)

Pulaski County (203 sq mi)

Putnam County (172 sq mi)

Randolph County (576 sq mi)

Richland County (362 sq mi)

Rock Island County (428 sq mi)

St. Clair County (674 sq mi)

Saline County (387 sq mi)

Sangamon County (877 sq mi)

Schuyler County (437 sq mi)

Scott County (251 sq mi)

Shelby County (768 sq mi)

Stark County (288 sq mi)

Stephenson County (565 sq mi)

Tazewell County (649 sq mi)

Union County (422 sq mi)

Vermilion County (901 sq mi)

Wabash County (228 sq mi)

Warren County (543 sq mi)

Washington County (563 sq mi)

Wayne County (715 sq mi)

White County (502 sq mi)

Whiteside County (697 sq mi)

Will County (836 sq mi)

Williamson County (420 sq mi)

Winnebago County (519 sq mi)

Woodford County (543 sq mi)

List of Illinois counties and their county seats

Adams (Quincy)

Alexander (Cairo)

Bond (Greenville), Boone (Belvidere), Brown (Mount Sterling), Bureau (Princeton)

Calhoun (Hardin) Carroll (Mount Carroll), Cass (Virginia), Champaign (Urbana), Christian (Taylorville), Clark (Marshall), Clay (Louisville), Clinton (Carlyle), Coles (Charleston), Cook (Chicago), Crawford (Robinson), and Cumberland (Toledo)

DeKalb (Sycamore), DeWitt (Clinton), Douglas (Tuscola), DuPage (Wheaton), Edgar (Paris), Edwards (Albion), Effingham (Effingham), Fayette (Vandalia), Ford (Paxton), Franklin (Benton), Fulton (Lewistown), Gallatin (Shawneetown), Greene (Carrollton), and Grundy (Morris)

Hamilton (McLeansboro), Hancock (Carthage), Hardin (Elizabethtown), Henderson (Oquawka), Henry (Cambridge), Iroquois (Watseka), Jackson (Murphysboro), Jasper (Newton), Jefferson (Mount Vernon), Jersey (Jerseyville), Jo Daviess (Galena), and Johnson (Vienna)

Kane (Geneva), Kankakee (Kankakee), Kendall (Yorkville), Knox (Galesburg), Lake (Waukegan), LaSalle (Ottawa), Lawrence (Lawrenceville), Lee (Dixon), Livingston (Pontiac), Logan (Lincoln)

Macon (Decatur), Macoupin (Carlinville), Madison (Edwardsville), Marion (Salem), Marshall (Lacon), Mason (Havana), Massac (Metropolis), McDonough (Macomb), McHenry (Woodstock), McLean (Bloomington), Menard (Petersburg), Mercer (Aledo), Monroe (Waterloo), Montgomery (Hillsboro), Morgan (Jacksonville), Moultrie (Sullivan)

Ogle (Oregon), Peoria (Peoria), Perry (Pinckneyville), Piatt (Monticello), Pike (Pittsfield), Pope (Golconda), Pulaski (Mound City), Putnam (Hennepin), Randolph (Chester), Richland (Olney), Rock Island (Rock Island), St Clair – Belleville, Saline – Harrisburg, Sangamon (Springfield), Schuyler (Rushville), Scott (Winchester), Shelby (Shelbyville), Stark (Toulon), and Stephenson (Freeport)

Tazewell (Pekin), Union (Jonesboro), Vermilion (Danville), Wabash (Mount Carmel), Warren (Monmouth), Washington (Nashville), Wayne (Fairfield), White (Carmi), Whiteside (Morrison), Will (Joliet), Williamson (Marion), Winnebago (Rockford), and Woodford (Eureka).

Top 10 counties you should know

Cook County

Location: North Eastern

Size: 945 sq mi.

Places to visit: Navy Pier, Millennium Park and Willis Tower.

DuPage County

Location: West

Size: 336 sq mi.

Places to visit: Cantigny Park and Morton Arboretum.

Lake County

Location: Northeast.

Size: 443 sq mi.

Places to visit: Illinois Beach State Park and the Six Flags Great America

Will County

Location: South

Size: 836 sq mi.

Places to visit: Midewin National Tallgrass Prairie and Rialto Square Theatre

Kane County

Location: West

Size: 520 sq mi.

Places to visit: Fox River Trail and Fabyan Villa Museum

McLean County

Location: Central

Size: 1,184 sq mi.

Places to visit: Constitution Trail and Miller Park Zoo

Champaign County

Location: East-central

Size: 996 sq mi.

Places to visit: Krannert Art Museum and the University of Illinois.

Sangamon County

Location: Central

Size: 868 sq mi.

Places to visit: Illinois State Capitol and the Abraham Lincoln Presidential Library

Peoria County

Location: Central

Size: 619 sq mi.

Places to visit: Wildlife Prairie Park and Peoria Riverfront Museum

Winnebago County

Location: Northern

Size: 513 sq mi.

Places to visit: Rock Cut State Park and Anderson Japanese Gardens.