Illinois county websites: security rankings

Security scores, grades, and the most common failures for 96 Illinois county websites, from ScanGov homepage scans.

  • Sites: 96
  • Last scan: 11/7/2026

Showing Illinois county sites. All U.S. county sites

B 83

Average security score of 85 fully scanned Illinois county sites

11th

of 49 states, ranked by average security score

85 of 96

Sites fully scanned. We couldn't fully scan 11, so they're listed without grades

B 83

U.S. county average security score, 2467 fully scanned sites

Illinois's state site, illinois.gov, ranks 9th of 51 state sites with a B. State rankings.

How Illinois county security scores are distributed

Smoothed distribution of the 85 fully scanned Illinois county sites, score 0 to 100. Height shows how many sites score near each value.

  • Illinois average
  • U.S. county average
View the data table
Score rangeSites
0 to 90
10 to 190
20 to 290
30 to 390
40 to 490
50 to 591
60 to 696
70 to 7932
80 to 8928
90 to 10018

Illinois counties by security grade

Each county with a site on our list is colored by that site's grade. Select a county to open its report. The table lists every site.

Adams County, IL: not fully scanned, so not graded (status 403) Alexander County, IL: grade B, security score 87 Bond County, IL: grade B, security score 87 Boone County, IL: grade C, security score 75 Brown County, IL: grade C, security score 75 Bureau County, IL: grade B, security score 87 Calhoun County, IL: grade B, security score 87 Carroll County, IL: grade C, security score 75 Cass County, IL: grade C, security score 75 Champaign County, IL: grade C, security score 77 Christian County, IL: not fully scanned, so not graded (status 996) Clark County, IL: grade D, security score 62 Clay County, IL: not fully scanned, so not graded (status 403) Clinton County, IL: grade A, security score 100 Coles County, IL: grade B, security score 88 Cook County, IL: grade A, security score 100 Crawford County, IL: grade C, security score 75 Cumberland County, IL: grade C, security score 75 DeKalb County, IL: not fully scanned, so not graded (status 999) DeWitt County, IL: grade C, security score 75 Douglas County, IL: grade C, security score 77 DuPage County, IL: grade A, security score 100 Edgar County, IL: grade C, security score 75 Effingham County, IL: grade A, security score 100 Fayette County, IL: grade B, security score 87 Ford County, IL: grade A, security score 100 Franklin County, IL: grade B, security score 87 Fulton County, IL: grade C, security score 75 Gallatin County, IL: grade C, security score 75 Greene County, IL: grade C, security score 75 Grundy County, IL: grade C, security score 75 Hamilton County, IL: grade B, security score 87 Hancock County, IL: not fully scanned, so not graded (status 403) Henry County, IL: grade B, security score 87 Iroquois County, IL: grade B, security score 87 Jackson County, IL: grade A, security score 100 Jasper County, IL: grade A, security score 100 Jefferson County, IL: grade C, security score 75 Jersey County, IL: grade B, security score 87 Jo Daviess County, IL: grade A, security score 100 Kane County, IL: grade A, security score 100 Kankakee County, IL: grade B, security score 87 Kendall County, IL: not fully scanned, so not graded (status 403) Knox County, IL: grade B, security score 87 Lake County, IL: grade A, security score 100 LaSalle County, IL: grade A, security score 100 Lawrence County, IL: grade C, security score 75 Lee County, IL: grade C, security score 75 Livingston County, IL: grade C, security score 75 Logan County, IL: grade B, security score 88 McDonough County, IL: grade F, security score 57 McHenry County, IL: not fully scanned, so not graded (status 403) McLean County, IL: grade A, security score 100 Macon County, IL: grade C, security score 77 Macoupin County, IL: grade A, security score 100 Madison County, IL: grade C, security score 75 Marion County, IL: grade B, security score 87 Marshall County, IL: grade C, security score 75 Mason County, IL: grade C, security score 75 Massac County, IL: grade B, security score 87 Menard County, IL: grade B, security score 87 Mercer County, IL: grade D, security score 62 Montgomery County, IL: grade B, security score 87 Morgan County, IL: grade D, security score 62 Moultrie County, IL: grade B, security score 87 Ogle County, IL: grade C, security score 75 Peoria County, IL: grade A, security score 100 Perry County, IL: not fully scanned, so not graded (status 999) Piatt County, IL: grade C, security score 75 Pike County, IL: grade C, security score 75 Pulaski County, IL: grade C, security score 75 Putnam County, IL: grade C, security score 75 Randolph County, IL: grade B, security score 87 Richland County, IL: grade B, security score 87 Rock Island County, IL: grade A, security score 100 Saint Clair County, IL: grade D, security score 66 Saline County, IL: grade B, security score 87 Sangamon County, IL: grade C, security score 75 Schuyler County, IL: grade B, security score 87 Scott County, IL: grade C, security score 75 Shelby County, IL: grade B, security score 87 Stark County, IL: grade A, security score 100 Stephenson County, IL: grade C, security score 75 Tazewell County, IL: grade B, security score 87 Union County, IL: not fully scanned, so not graded (status 996) Vermilion County, IL: grade D, security score 62 Warren County, IL: grade C, security score 75 Washington County, IL: grade B, security score 87 Wayne County, IL: grade C, security score 75 White County, IL: grade B, security score 87 Whiteside County, IL: grade A, security score 100 Will County, IL: grade D, security score 66 Williamson County, IL: not fully scanned, so not graded (status 999) Winnebago County, IL: grade A, security score 100 Woodford County, IL: grade B, security score 87
  • A (90 to 100)
  • B to C (70 to 89)
  • D to F (below 70)
  • Not fully scanned
  • No site on our list

1 of the 96 sites on our list could not be matched to a county boundary and appear only in the table.

Illinois counties by security grade, compared with all U.S. counties

Share of fully scanned sites in each grade band. Illinois: 85 sites. U.S.: 2467 sites.

  1. Illinois
  2. All U.S. counties
  • A (90 to 100)
  • B to C (70 to 89)
  • D to F (below 70)
View the data table
GroupA (90 to 100)B to C (70 to 89)D to F (below 70)
Illinois21% (18)71% (60)8% (7)
All U.S. counties21% (530)67% (1,642)12% (295)

Top 3 Illinois county sites by security score

#1 in Illinois · U.S. rank 1

Clinton County, IL

A 100 security

  • Accessibility D
  • Botability B
  • Security A
  • Usability F
  • Readability F

#1 in Illinois · U.S. rank 1

Cook County, IL

A 100 security

  • Accessibility A
  • Botability A
  • Security A
  • Usability A
  • Readability F

#1 in Illinois · U.S. rank 1

DuPage County, IL

A 100 security

  • Accessibility B
  • Botability D
  • Security A
  • Usability F
  • Readability F

Most common security failures among Illinois county sites

Share of the 85 fully scanned Illinois county sites failing each check. A site can fail more than one check. Each check links to its standard and how to fix it.

  1. X-Content-Type-Options65%
  2. Errors in the console39%
  3. Sponsored top-level domain (sTLD)21%
  4. Security.txt7%
  5. Hypertext Transfer Protocol Secure (HTTPS)1%
View the data table
CheckShare failingSites failing
X-Content-Type-Options65%55
Errors in the console39%33
Sponsored top-level domain (sTLD)21%18
Security.txt7%6
Hypertext Transfer Protocol Secure (HTTPS)1%1

What each check means

  • X-Content-Type-Options. The site tells browsers not to guess the type of files it serves. Browsers might run dangerous files by mistake.
  • Errors in the console. The page loads without JavaScript or network errors. Site may have hidden bugs that break features.
  • Sponsored top-level domain (sTLD). The site uses a government-issued domain (.gov, .edu, or .mil). People cannot tell if your site is real government.
  • Security.txt. The site has a security.txt file so researchers know how to report issues. Security researchers cannot report problems to you.
  • Hypertext Transfer Protocol Secure (HTTPS). The site uses HTTPS to encrypt data between the server and users. Hackers can see and steal personal information.

All Illinois county sites by security score

Rank Site Checks passed Grade
1 clintonco.illinois.gov
Clinton County, IL U.S. rank 1 		8 of 8 checks pass A
1 cookcountyil.gov
Cook County, IL U.S. rank 1 		8 of 8 checks pass A
1 dupagecounty.gov
DuPage County, IL U.S. rank 1 		8 of 8 checks pass A
1 effinghamcountyil.gov
Effingham County, IL U.S. rank 1 		8 of 8 checks pass A
1 fordcounty.illinois.gov
Ford County, IL U.S. rank 1 		8 of 8 checks pass A
1 jacksoncounty-il.gov
Jackson County, IL U.S. rank 1 		8 of 8 checks pass A
1 jaspercountyillinois.gov
Jasper County, IL U.S. rank 1 		8 of 8 checks pass A
1 jodaviesscountyil.gov
Jo Daviess County, IL U.S. rank 1 		8 of 8 checks pass A
1 kanecountyil.gov
Kane County, IL U.S. rank 1 		8 of 8 checks pass A
1 lakecountyil.gov
Lake County, IL U.S. rank 1 		8 of 8 checks pass A
1 lasallecountyil.gov
LaSalle County, IL U.S. rank 1 		8 of 8 checks pass A
1 macoupincountyil.gov
Macoupin County, IL U.S. rank 1 		8 of 8 checks pass A
1 mcleancountyil.gov
McLean County, IL U.S. rank 1 		8 of 8 checks pass A
1 peoriacounty.gov
Peoria County, IL U.S. rank 1 		8 of 8 checks pass A
1 rockislandcountyil.gov
Rock Island County, IL U.S. rank 1 		8 of 8 checks pass A
1 starkco.illinois.gov
Stark County, IL U.S. rank 1 		8 of 8 checks pass A
1 whitesidecountyil.gov
Whiteside County, IL U.S. rank 1 		8 of 8 checks pass A
1 wincoil.gov
Winnebago County, IL U.S. rank 1 		8 of 8 checks pass A
2 colesco.illinois.gov
Coles County, IL U.S. rank 2 		8 of 9 checks pass B
2 logancountyil.gov
Logan County, IL U.S. rank 2 		8 of 9 checks pass B
3 alexandercounty.illinois.gov
Alexander County, IL U.S. rank 3 		7 of 8 checks pass B
3 bondcountyil.gov
Bond County, IL U.S. rank 3 		7 of 8 checks pass B
3 bureaucounty-il.gov
Bureau County, IL U.S. rank 3 		7 of 8 checks pass B
3 calhouncountyil.gov
Calhoun County, IL U.S. rank 3 		7 of 8 checks pass B
3 fayettecountyillinois.gov
Fayette County, IL U.S. rank 3 		7 of 8 checks pass B
3 franklincountyil.gov
Franklin County, IL U.S. rank 3 		7 of 8 checks pass B
3 hamiltoncountyil.gov
Hamilton County, IL U.S. rank 3 		7 of 8 checks pass B
3 henrycty.com
Henry County, IL U.S. rank 3 		7 of 8 checks pass B
3 iroquoiscountyil.gov
Iroquois County, IL U.S. rank 3 		7 of 8 checks pass B
3 jerseycounty-il.gov
Jersey County, IL U.S. rank 3 		7 of 8 checks pass B
3 k3county.net
Kankakee County, IL U.S. rank 3 		7 of 8 checks pass B
3 knoxcountyil.gov
Knox County, IL U.S. rank 3 		7 of 8 checks pass B
3 marioncountyil.gov
Marion County, IL U.S. rank 3 		7 of 8 checks pass B
3 massaccountyil.gov
Massac County, IL U.S. rank 3 		7 of 8 checks pass B
3 menardcountyil.gov
Menard County, IL U.S. rank 3 		7 of 8 checks pass B
3 montgomerycountyil.gov
Montgomery County, IL U.S. rank 3 		7 of 8 checks pass B
3 moultriecountyil.gov
Moultrie County, IL U.S. rank 3 		7 of 8 checks pass B
3 randolphcountyil.gov
Randolph County, IL U.S. rank 3 		7 of 8 checks pass B
3 richlandcounty.illinois.gov
Richland County, IL U.S. rank 3 		7 of 8 checks pass B
3 salinecounty.illinois.gov
Saline County, IL U.S. rank 3 		7 of 8 checks pass B
3 schuylercounty.org
Schuyler County, IL U.S. rank 3 		7 of 8 checks pass B
3 shelbycounty-il.gov
Shelby County, IL U.S. rank 3 		7 of 8 checks pass B
3 tazewell-il.gov
Tazewell County, IL U.S. rank 3 		7 of 8 checks pass B
3 washingtonco.illinois.gov
Washington County, IL U.S. rank 3 		7 of 8 checks pass B
3 whitecounty-il.gov
White County, IL U.S. rank 3 		7 of 8 checks pass B
3 woodford-county.org
Woodford County, IL U.S. rank 3 		7 of 8 checks pass B
4 champaigncountyil.gov
Champaign County, IL U.S. rank 5 		7 of 9 checks pass C
4 douglascountyil.gov
Douglas County, IL U.S. rank 5 		7 of 9 checks pass C
4 maconcounty.illinois.gov
Macon County, IL U.S. rank 5 		7 of 9 checks pass C
5 boonecountyil.gov
Boone County, IL U.S. rank 6 		6 of 8 checks pass C
5 browncoil.org
Brown County, IL U.S. rank 6 		6 of 8 checks pass C
5 carrollcountyil.gov
Carroll County, IL U.S. rank 6 		6 of 8 checks pass C
5 co.cass.il.us
Cass County, IL U.S. rank 6 		6 of 8 checks pass C
5 crawfordcountyil.org
Crawford County, IL U.S. rank 6 		6 of 8 checks pass C
5 cumberlandcoil.gov
Cumberland County, IL U.S. rank 6 		6 of 8 checks pass C
5 dewittcountyil.gov
DeWitt County, IL U.S. rank 6 		6 of 8 checks pass C
5 edgarcountyillinois.com
Edgar County, IL U.S. rank 6 		6 of 8 checks pass C
5 fultoncountyil.gov
Fulton County, IL U.S. rank 6 		6 of 8 checks pass C
5 gallatinco.illinois.gov
Gallatin County, IL U.S. rank 6 		6 of 8 checks pass C
5 greenecountyil.org
Greene County, IL U.S. rank 6 		6 of 8 checks pass C
5 grundycountyil.gov
Grundy County, IL U.S. rank 6 		6 of 8 checks pass C
5 jeffersoncounty.illinois.gov
Jefferson County, IL U.S. rank 6 		6 of 8 checks pass C
5 lawrencecounty.illinois.gov
Lawrence County, IL U.S. rank 6 		6 of 8 checks pass C
5 leecountyil.com
Lee County, IL U.S. rank 6 		6 of 8 checks pass C
5 livingstoncountyil.gov
Livingston County, IL U.S. rank 6 		6 of 8 checks pass C
5 madisoncountyil.gov
Madison County, IL U.S. rank 6 		6 of 8 checks pass C
5 marshallcountyillinois.gov
Marshall County, IL U.S. rank 6 		6 of 8 checks pass C
5 masoncountyil.gov
Mason County, IL U.S. rank 6 		6 of 8 checks pass C
5 oglecountyil.gov
Ogle County, IL U.S. rank 6 		6 of 8 checks pass C
5 piatt.gov
Piatt County, IL U.S. rank 6 		6 of 8 checks pass C
5 pikecountyil.org
Pike County, IL U.S. rank 6 		6 of 8 checks pass C
5 pulaskicountyil.net
Pulaski County, IL U.S. rank 6 		6 of 8 checks pass C
5 putnamil.gov
Putnam County, IL U.S. rank 6 		6 of 8 checks pass C
5 sangamonil.gov
Sangamon County, IL U.S. rank 6 		6 of 8 checks pass C
5 scottcoil.gov
Scott County, IL U.S. rank 6 		6 of 8 checks pass C
5 stephensoncountyil.gov
Stephenson County, IL U.S. rank 6 		6 of 8 checks pass C
5 warrencountyil.gov
Warren County, IL U.S. rank 6 		6 of 8 checks pass C
5 waynecountyil.gov
Wayne County, IL U.S. rank 6 		6 of 8 checks pass C
6 co.st-clair.il.us
Saint Clair County, IL U.S. rank 8 		6 of 9 checks pass D
6 willcounty.gov
Will County, IL U.S. rank 8 		6 of 9 checks pass D
7 clarkcountyil.org
Clark County, IL U.S. rank 9 		5 of 8 checks pass D
7 mercercountyil.org
Mercer County, IL U.S. rank 9 		5 of 8 checks pass D
7 morgancounty-il.com
Morgan County, IL U.S. rank 9 		5 of 8 checks pass D
7 vercounty.org
Vermilion County, IL U.S. rank 9 		5 of 8 checks pass D
8 mcg.mcdonough.il.us
McDonough County, IL U.S. rank 10 		4 of 7 checks pass F
adamscountyil.gov
Adams County, IL 		Not fully scanned, so not graded. We weren't able to fully scan your site. Status 403 -
christiancountyil.gov
Christian County, IL 		Not fully scanned, so not graded. We couldn't scan your site because it showed our bot a captcha or browser check instead of the page. Status 996 -
claycountyillinois.org
Clay County, IL 		Not fully scanned, so not graded. We weren't able to fully scan your site. Status 403 -
dekalbcounty.org
DeKalb County, IL 		Not fully scanned, so not graded. We weren't able to fully scan your site. Status 999 -
hancockcounty-il.gov
Hancock County, IL 		Not fully scanned, so not graded. We weren't able to fully scan your site. Status 403 -
kendallcountyil.gov
Kendall County, IL 		Not fully scanned, so not graded. We weren't able to fully scan your site. Status 403 -
mchenrycountyil.gov
McHenry County, IL 		Not fully scanned, so not graded. We weren't able to fully scan your site. Status 403 -
monroecountyil.gov
Monroe County, IL 		Not fully scanned, so not graded. We couldn't scan your site because it showed our bot a captcha or browser check instead of the page. Status 996 -
perrycountyil.gov
Perry County, IL 		Not fully scanned, so not graded. We weren't able to fully scan your site. Status 999 -
unioncountyil.gov
Union County, IL 		Not fully scanned, so not graded. We couldn't scan your site because it showed our bot a captcha or browser check instead of the page. Status 996 -
williamsoncountyil.gov
Williamson County, IL 		Not fully scanned, so not graded. We weren't able to fully scan your site. Status 999 -

About this data

ScanGov scans the homepage of each county site on our county list in Illinois. Scores come from the checks in the ScanGov standards. Sites were scanned between 9/28/2026 and 11/7/2026. Each site's report shows its own scan date. A site counts as fully scanned when its homepage loaded and sent us its page content. Averages, grade shares, failure rates, and ranks use fully scanned sites only. We could not fully scan 11 sites. They did not respond, blocked the scanner, or sent no page content. They appear in the table without grades, with their scan status, and are left out of every figure. Grades follow the ScanGov grade scale. Rank follows the ScanGov ranking method. The full dataset, with every county's raw results, is in the ScanGov data repository.

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