Property research by county

Illinois county reference

102 counties and county equivalents in Illinois. Search names or FIPS codes, compare Census geography and keep the original sources with your work.

• Adams County

  Illinois · FIPS 17001

  64,267 residents · 2025 estimate

• Alexander County

  Illinois · FIPS 17003

  4,570 residents · 2025 estimate

• Bond County

  Illinois · FIPS 17005

  16,959 residents · 2025 estimate

• Boone County

  Illinois · FIPS 17007

  53,568 residents · 2025 estimate

• Brown County

  Illinois · FIPS 17009

  6,401 residents · 2025 estimate

• Bureau County

  Illinois · FIPS 17011

  32,510 residents · 2025 estimate

• Calhoun County

  Illinois · FIPS 17013

  4,300 residents · 2025 estimate

• Carroll County

  Illinois · FIPS 17015

  15,419 residents · 2025 estimate

• Cass County

  Illinois · FIPS 17017

  12,463 residents · 2025 estimate

• Champaign County

  Illinois · FIPS 17019

  209,972 residents · 2025 estimate

• Christian County

  Illinois · FIPS 17021

  33,443 residents · 2025 estimate

• Clark County

  Illinois · FIPS 17023

  15,114 residents · 2025 estimate

• Clay County

  Illinois · FIPS 17025

  12,793 residents · 2025 estimate

• Clinton County

  Illinois · FIPS 17027

  37,128 residents · 2025 estimate

• Coles County

  Illinois · FIPS 17029

  46,607 residents · 2025 estimate

• Cook County

  Illinois · FIPS 17031

  5,194,625 residents · 2025 estimate

• Crawford County

  Illinois · FIPS 17033

  18,648 residents · 2025 estimate

• Cumberland County

  Illinois · FIPS 17035

  10,208 residents · 2025 estimate

• De Witt County

  Illinois · FIPS 17039

  15,118 residents · 2025 estimate

• DeKalb County

  Illinois · FIPS 17037

  101,835 residents · 2025 estimate

• Douglas County

  Illinois · FIPS 17041

  19,880 residents · 2025 estimate

• DuPage County

  Illinois · FIPS 17043

  934,298 residents · 2025 estimate

• Edgar County

  Illinois · FIPS 17045

  16,323 residents · 2025 estimate

• Edwards County

  Illinois · FIPS 17047

  5,898 residents · 2025 estimate

• Effingham County

  Illinois · FIPS 17049

  34,519 residents · 2025 estimate

• Fayette County

  Illinois · FIPS 17051

  20,790 residents · 2025 estimate

• Ford County

  Illinois · FIPS 17053

  13,216 residents · 2025 estimate

• Franklin County

  Illinois · FIPS 17055

  36,916 residents · 2025 estimate

• Fulton County

  Illinois · FIPS 17057

  32,901 residents · 2025 estimate

• Gallatin County

  Illinois · FIPS 17059

  4,616 residents · 2025 estimate

• Greene County

  Illinois · FIPS 17061

  11,313 residents · 2025 estimate

• Grundy County

  Illinois · FIPS 17063

  54,052 residents · 2025 estimate

• Hamilton County

  Illinois · FIPS 17065

  7,859 residents · 2025 estimate

• Hancock County

  Illinois · FIPS 17067

  16,803 residents · 2025 estimate

• Hardin County

  Illinois · FIPS 17069

  3,588 residents · 2025 estimate

• Henderson County

  Illinois · FIPS 17071

  5,984 residents · 2025 estimate

• Henry County

  Illinois · FIPS 17073

  48,095 residents · 2025 estimate

• Iroquois County

  Illinois · FIPS 17075

  26,150 residents · 2025 estimate

• Jackson County

  Illinois · FIPS 17077

  52,501 residents · 2025 estimate

• Jasper County

  Illinois · FIPS 17079

  9,032 residents · 2025 estimate

• Jefferson County

  Illinois · FIPS 17081

  36,147 residents · 2025 estimate

• Jersey County

  Illinois · FIPS 17083

  21,160 residents · 2025 estimate

• Jo Daviess County

  Illinois · FIPS 17085

  21,594 residents · 2025 estimate

• Johnson County

  Illinois · FIPS 17087

  13,363 residents · 2025 estimate

• Kane County

  Illinois · FIPS 17089

  525,757 residents · 2025 estimate

• Kankakee County

  Illinois · FIPS 17091

  105,525 residents · 2025 estimate

• Kendall County

  Illinois · FIPS 17093

  145,470 residents · 2025 estimate

• Knox County

  Illinois · FIPS 17095

  47,767 residents · 2025 estimate

• Lake County

  Illinois · FIPS 17097

  719,339 residents · 2025 estimate

• LaSalle County

  Illinois · FIPS 17099

  107,773 residents · 2025 estimate

• Lawrence County

  Illinois · FIPS 17101

  13,790 residents · 2025 estimate

• Lee County

  Illinois · FIPS 17103

  32,914 residents · 2025 estimate

• Livingston County

  Illinois · FIPS 17105

  35,057 residents · 2025 estimate

• Logan County

  Illinois · FIPS 17107

  27,182 residents · 2025 estimate

• Macon County

  Illinois · FIPS 17115

  99,300 residents · 2025 estimate

• Macoupin County

  Illinois · FIPS 17117

  43,748 residents · 2025 estimate

• Madison County

  Illinois · FIPS 17119

  263,110 residents · 2025 estimate

• Marion County

  Illinois · FIPS 17121

  36,382 residents · 2025 estimate

• Marshall County

  Illinois · FIPS 17123

  11,473 residents · 2025 estimate

• Mason County

  Illinois · FIPS 17125

  12,411 residents · 2025 estimate

• Massac County

  Illinois · FIPS 17127

  13,502 residents · 2025 estimate

• McDonough County

  Illinois · FIPS 17109

  25,916 residents · 2025 estimate

• McHenry County

  Illinois · FIPS 17111

  317,751 residents · 2025 estimate

• McLean County

  Illinois · FIPS 17113

  171,419 residents · 2025 estimate

• Menard County

  Illinois · FIPS 17129

  11,863 residents · 2025 estimate

• Mercer County

  Illinois · FIPS 17131

  15,229 residents · 2025 estimate

• Monroe County

  Illinois · FIPS 17133

  34,840 residents · 2025 estimate

• Montgomery County

  Illinois · FIPS 17135

  28,076 residents · 2025 estimate

• Morgan County

  Illinois · FIPS 17137

  32,515 residents · 2025 estimate

• Moultrie County

  Illinois · FIPS 17139

  14,371 residents · 2025 estimate

• Ogle County

  Illinois · FIPS 17141

  51,399 residents · 2025 estimate

• Peoria County

  Illinois · FIPS 17143

  178,553 residents · 2025 estimate

• Perry County

  Illinois · FIPS 17145

  20,160 residents · 2025 estimate

• Piatt County

  Illinois · FIPS 17147

  16,791 residents · 2025 estimate

• Pike County

  Illinois · FIPS 17149

  14,231 residents · 2025 estimate

• Pope County

  Illinois · FIPS 17151

  3,672 residents · 2025 estimate

• Pulaski County

  Illinois · FIPS 17153

  4,820 residents · 2025 estimate

• Putnam County

  Illinois · FIPS 17155

  5,619 residents · 2025 estimate

• Randolph County

  Illinois · FIPS 17157

  29,921 residents · 2025 estimate

• Richland County

  Illinois · FIPS 17159

  15,219 residents · 2025 estimate

• Rock Island County

  Illinois · FIPS 17161

  141,869 residents · 2025 estimate

• Saline County

  Illinois · FIPS 17165

  22,772 residents · 2025 estimate

• Sangamon County

  Illinois · FIPS 17167

  194,170 residents · 2025 estimate

• Schuyler County

  Illinois · FIPS 17169

  6,657 residents · 2025 estimate

• Scott County

  Illinois · FIPS 17171

  4,866 residents · 2025 estimate

• Shelby County

  Illinois · FIPS 17173

  20,576 residents · 2025 estimate

• St. Clair County

  Illinois · FIPS 17163

  250,708 residents · 2025 estimate

• Stark County

  Illinois · FIPS 17175

  5,319 residents · 2025 estimate

• Stephenson County

  Illinois · FIPS 17177

  43,220 residents · 2025 estimate

• Tazewell County

  Illinois · FIPS 17179

  130,049 residents · 2025 estimate

• Union County

  Illinois · FIPS 17181

  16,656 residents · 2025 estimate

• Vermilion County

  Illinois · FIPS 17183

  71,259 residents · 2025 estimate

• Wabash County

  Illinois · FIPS 17185

  10,907 residents · 2025 estimate

• Warren County

  Illinois · FIPS 17187

  16,222 residents · 2025 estimate

• Washington County

  Illinois · FIPS 17189

  13,564 residents · 2025 estimate

• Wayne County

  Illinois · FIPS 17191

  15,882 residents · 2025 estimate

• White County

  Illinois · FIPS 17193

  13,250 residents · 2025 estimate

• Whiteside County

  Illinois · FIPS 17195

  54,121 residents · 2025 estimate

• Will County

  Illinois · FIPS 17197

  712,253 residents · 2025 estimate

• Williamson County

  Illinois · FIPS 17199

  67,225 residents · 2025 estimate

• Winnebago County

  Illinois · FIPS 17201

  283,674 residents · 2025 estimate

• Woodford County

  Illinois · FIPS 17203

  38,111 residents · 2025 estimate

Use the county data

Use the county name and FIPS code to identify the correct jurisdiction before collecting parcel, assessor, recorder or court information. Compare this national reference with the separate property-data coverage directory.

National geographic coverage does not mean that parcel records or probate feeds are connected for every county.

Geography: 2025 U.S. Census Gazetteer. Population: Vintage 2025 estimates, July 1, 2025. County equivalents include parishes, boroughs, independent cities and planning regions. Puerto Rico population is not supplied by this population file.