List of counties in Illinois

Listed are the 102 counties in the state of Illinois. Current county seats are shown in parentheses.

[edit] Current counties

State Abbr.	FIPS State Code	State
IL	17	Illinois
	FIPS County Code	County Name
	001	Adams County (Quincy)
	003	Alexander County (Cairo)
	005	Bond County (Greenville)
	007	Boone County (Belvidere)
	009	Brown County (Mount Sterling)
	011	Bureau County (Princeton)
	013	Calhoun County (Hardin)
	015	Carroll County (Mount Carroll)
	017	Cass County (Virginia)
	019	Champaign County (Urbana)
	021	Christian County (Taylorville)
	023	Clark County (Marshall)
	025	Clay County (Louisville)
	027	Clinton County (Carlyle)
	029	Coles County (Charleston)
	031	Cook County (Chicago)
	033	Crawford County (Robinson)

State Abbr.	FIPS State Code	State
IL	17	Illinois
	FIPS County Code	County Name
	035	Cumberland County (Toledo)
	037	DeKalb County (Sycamore)
	039	De Witt County (Clinton)
	041	Douglas County (Tuscola)
	043	DuPage County (Wheaton)
	045	Edgar County (Paris)
	047	Edwards County (Albion)
	049	Effingham County (Effingham)
	051	Fayette County (Vandalia)
	053	Ford County (Paxton)
	055	Franklin County (Benton)
	057	Fulton County (Lewiston)
	059	Gallatin County (Shawneetown)
	061	Greene County (Carrollton)
	063	Grundy County (Morris)
	065	Hamilton County (McLeansboro)
	067	Hancock County (Carthage)
	069	Hardin County (Elizabethtown)
	071	Henderson County (Oquawka)
	073	Henry County (Cambridge)
	075	Iroquois County (Watseka)
	077	Jackson County (Murphysboro)
	079	Jasper County (Newton)
	081	Jefferson County (Mount Vernon)
	083	Jersey County (Jerseyville)
	085	Jo Daviess County (Galena)
	087	Johnson County (Vienna)
	089	Kane County (Geneva)
	091	Kankakee County (Kankakee)

State Abbr.	FIPS State Code	State
IL	17	Illinois
	FIPS County Code	County Name
	093	Kendall County (Yorkville)
	095	Knox County (Galesburg)
	099	La Salle County (Ottawa)
	097	Lake County (Waukegan)
	101	Lawrence County (Lawrenceville)
	103	Lee County (Dixon)
	105	Livingston County (Pontiac)
	107	Logan County (Lincoln)
	109	McDonough County (Macomb)
	111	McHenry County (Woodstock)
	113	McLean County (Bloomington)
	115	Macon County (Decatur)
	117	Macoupin County (Carlinville)
	119	Madison County (Edwardsville)
	121	Marion County (Salem)
	123	Marshall County (Lacon)
	125	Mason County (Havana)
	127	Massac County (Metropolis)
	129	Menard County (Petersburg)
	131	Mercer County (Aledo)
	133	Monroe County (Waterloo)
	135	Montgomery County (Hillsboro)
	137	Morgan County (Jacksonville)
	139	Moultrie County (Sullivan)
	141	Ogle County (Oregon)
	143	Peoria County (Peoria)
	145	Perry County (Pinckneyville)
	147	Piatt County (Monticello)
	149	Pike County (Pittsfield)
	151	Pope County (Golconda)

State Abbr.	FIPS State Code	State
IL	17	Illinois
	FIPS County Code	County Name
	153	Pulaski County (Mound City)
	155	Putnam County (Hennepin)
	157	Randolph County (Chester)
	159	Richland County (Olney)
	161	Rock Island County (Rock Island)
	163	St. Clair County (Belleville)
	165	Saline County (Harrisburg)
	167	Sangamon County (Springfield)
	169	Schuyler County (Rushville)
	171	Scott County (Winchester)
	173	Shelby County (Shelbyville)
	175	Stark County (Toulon)
	177	Stephenson County (Freeport)
	179	Tazewell County (Pekin)
	181	Union County (Jonesboro)
	183	Vermilion County (Danville)
	185	Wabash County (Mount Carmel)
	187	Warren County (Monmouth)
	189	Washington County (Nashville)
	191	Wayne County (Fairfield)
	193	White County (Carmi)
	195	Whiteside County (Morrison)
	197	Will County (Joliet)
	199	Williamson County (Marion)
	201	Winnebago County (Rockford)
	203	Woodford County (Eureka)

Dane County, renamed in 1840 to the current Christian County.
The original Knox County, Illinois, became extinct with the formation of the Illinois Territory in 1809, or, more precisely, it became Knox County, Indiana. The modern Knox County, Illinois was formed much later, and was not a part of the original Knox County.