Showing Missouri county sites. All U.S. county sites
C 79
Average security score of 85 fully scanned Missouri county sites
15th
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
Missouri's state site, mo.gov, ranks 16th of 51 state sites with a B. State rankings.
How Missouri county security scores are distributed
Smoothed distribution of the 85 fully scanned Missouri county sites, score 0 to 100. Height shows how many sites score near each value.
Distribution of 85 scores. The data table lists counts by score range.
- Missouri average
- U.S. county average
View the data table
| Score range | Sites |
|---|---|
| 0 to 9 | 0 |
| 10 to 19 | 0 |
| 20 to 29 | 0 |
| 30 to 39 | 0 |
| 40 to 49 | 0 |
| 50 to 59 | 0 |
| 60 to 69 | 14 |
| 70 to 79 | 39 |
| 80 to 89 | 21 |
| 90 to 100 | 11 |
Missouri 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.
- A (90 to 100)
- B to C (70 to 89)
- D to F (below 70)
- Not fully scanned
- No site on our list
Missouri counties by security grade, compared with all U.S. counties
Share of fully scanned sites in each grade band. Missouri: 85 sites. U.S.: 2467 sites.
- A (90 to 100)
- B to C (70 to 89)
- D to F (below 70)
View the data table
| Group | A (90 to 100) | B to C (70 to 89) | D to F (below 70) |
|---|---|---|---|
| Missouri | 13% (11) | 71% (60) | 16% (14) |
| All U.S. counties | 21% (530) | 67% (1,642) | 12% (295) |
Top 3 Missouri county sites by security score
#1 in Missouri · U.S. rank 1
Boone County, MO
A 100 security
- Accessibility A
- Botability A
- Security A
- Usability C
- Readability F
#1 in Missouri · U.S. rank 1
Camden County, MO
A 100 security
- Accessibility B
- Botability B
- Security A
- Usability F
- Readability A
#1 in Missouri · U.S. rank 1
City of St. Louis, MO
A 100 security
- Accessibility A
- Botability D
- Security A
- Usability A
- Readability A
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.
- 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.
- Errors in the console. The page loads without JavaScript or network errors. Site may have hidden bugs that break features.
- Hypertext Transfer Protocol Secure (HTTPS). The site uses HTTPS to encrypt data between the server and users. Hackers can see and steal personal information.
- Security.txt. The site has a security.txt file so researchers know how to report issues. Security researchers cannot report problems to you.
All Missouri county sites by security score
| Rank | Site | Checks passed | Grade |
|---|---|---|---|
| 1 |
boonemo.gov
Boone County, MO U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
camdencountymo.gov
Camden County, MO U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
stlouis-mo.gov
City of St. Louis, MO U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
claycountymo.gov
Clay County, MO U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
ironcountymo.gov
Iron County, MO U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
jaspercountymo.gov
Jasper County, MO U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
jocomo.gov
Johnson County, MO U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
lincolncomo.gov
Lincoln County, MO U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
salinecountymo.gov
Saline County, MO U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
texascountymissouri.gov
Texas County, MO U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
wrightcountymo.gov
Wright County, MO U.S. rank 1 |
8 of 8 checks pass | A |
| 2 |
carrollcountymo.gov
Carroll County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
casscounty.com
Cass County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
christiancountymo.gov
Christian County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
colecounty.org
Cole County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
coopercountymo.gov
Cooper County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
crawfordcountymo.net
Crawford County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
dunklincounty.gov
Dunklin County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
henrycomo.com
Henry County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
holtcountymo.gov
Holt County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
howellcountymo.gov
Howell County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
jeffcomo.gov
Jefferson County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
madisoncountymo.us
Madison County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
marioncounty-mo.gov
Marion County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
mcdonaldcountymo.gov
McDonald County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
morgancountymo.gov
Morgan County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
perrycountymo.us
Perry County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
rallscountymo.gov
Ralls County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
sccmo.org
Saint Charles County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
shannoncounty.gov
Shannon County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
stegencounty.gov
Ste. Genevieve County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 2 |
webstercountymo.gov
Webster County, MO U.S. rank 3 |
7 of 8 checks pass | B |
| 3 |
andrewcounty.org
Andrew County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
barrycountycollector.com
Barry County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
countyofbarton.gov
Barton County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
batescounty.net
Bates County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
butlercountymo.com
Butler County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
callawaycounty.org
Callaway County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
cedarcountymo.gov
Cedar County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
charitonco.com
Chariton County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
clarkcountymo.org
Clark County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
dadecountymo.gov
Dade County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
daviesscountymo.gov
Daviess County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
dekalbcountymo.com
DeKalb County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
greenecountymo.gov
Greene County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
jacksongov.org
Jackson County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
lacledecountymissouri.org
Laclede County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
lafayettecountymo.gov
Lafayette County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
lawrencecountymo.org
Lawrence County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
linncomo.com
Linn County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
livingstoncountymo.gov
Livingston County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
maconcountymo.com
Macon County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
mariescountymo.gov
Maries County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
millercountymo.gov
Miller County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
monroecountymo.gov
Monroe County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
newtoncountymo.com
Newton County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
nodawaycountymo.us
Nodaway County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
pemiscotcounty.org
Pemiscot County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
pettiscomo.gov
Pettis County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
polkcountymo.gov
Polk County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
randolphcounty-mo.com
Randolph County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
ripleycountymissouri.org
Ripley County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
sfcgov.org
Saint Francois County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
scotlandcountymo.org
Scotland County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
scottcountymo.com
Scott County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
shelbycountymo.com
Shelby County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
stoneco-mo.us
Stone County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
taneycounty.org
Taney County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
vernoncountymo.org
Vernon County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
warrencountymo.org
Warren County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 3 |
washingtoncountymo.us
Washington County, MO U.S. rank 6 |
6 of 8 checks pass | C |
| 4 |
cartercountymosheriff.org
Carter County, MO U.S. rank 8 |
6 of 9 checks pass | D |
| 5 |
adaircountymissouri.com
Adair County, MO U.S. rank 9 |
5 of 8 checks pass | D |
| 5 |
audraincounty.org
Audrain County, MO U.S. rank 9 |
5 of 8 checks pass | D |
| 5 |
bentoncomo.com
Benton County, MO U.S. rank 9 |
5 of 8 checks pass | D |
| 5 |
clintoncomo.org
Clinton County, MO U.S. rank 9 |
5 of 8 checks pass | D |
| 5 |
gentrycounty.net
Gentry County, MO U.S. rank 9 |
5 of 8 checks pass | D |
| 5 |
grundycountymo.com
Grundy County, MO U.S. rank 9 |
5 of 8 checks pass | D |
| 5 |
knoxcountymo.org
Knox County, MO U.S. rank 9 |
5 of 8 checks pass | D |
| 5 |
misscomo.net
Mississippi County, MO U.S. rank 9 |
5 of 8 checks pass | D |
| 5 |
new-madrid.mo.us
New Madrid County, MO U.S. rank 9 |
5 of 8 checks pass | D |
| 5 |
osagecountygov.com
Osage County, MO U.S. rank 9 |
5 of 8 checks pass | D |
| 5 |
ozarkcounty.net
Ozark County, MO U.S. rank 9 |
5 of 8 checks pass | D |
| 5 |
pikecountymo.net
Pike County, MO U.S. rank 9 |
5 of 8 checks pass | D |
| 5 |
raycountymo.com
Ray County, MO U.S. rank 9 |
5 of 8 checks pass | D |
|
co.buchanan.mo.us
Buchanan County, MO |
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 | - | |
|
capecounty.us
Cape Girardeau County, MO |
Not fully scanned, so not graded. We weren't able to fully scan your site. Status 999 | - | |
|
gasconadecounty.org
Gasconade County, MO |
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 | - | |
|
hickorycomo.net
Hickory County, MO |
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 | - | |
|
lewiscountymo.org
Lewis County, MO |
Not fully scanned, so not graded. We couldn't scan your site because the page never finished loading in our browser. Status 994 | - | |
|
mcmo.us
Montgomery County, MO |
Not fully scanned, so not graded. We couldn't scan your site because the page never finished loading in our browser. Status 994 | - | |
|
phelpscounty.org
Phelps County, MO |
Not fully scanned, so not graded. We didn't scan your site because its robots.txt asks crawlers to wait longer than we can. Status 997 | - | |
|
co.platte.mo.us
Platte County, MO |
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 | - | |
|
pulaskicountymo.org
Pulaski County, MO |
Not fully scanned, so not graded. We couldn't scan your site because the page never finished loading in our browser. Status 994 | - | |
|
stclaircomo.com
St. Clair County, MO |
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 | - | |
|
stlouiscountymo.gov
St. Louis County, MO |
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 | - |
About security
Secure your site and protect users with proper security practices.
Why it's important
Strong defenses prevent hackers from stealing personal information and other confidential data.
Risks
- Hackers can steal private information from your site.
Guidance
What we use to grade security:
- CISA Website Security
- 21st Century Integrated Digital Experience Act (IDEA)
- CISA Cybersecurity Performance Goals
- RFC 9116
- OWASP Top 10
- U.S. Federal Website Standards
Standards
- Content security policy (CSP)
- HTTP Strict Transport Security (HSTS)
- security.txt
- X-Content-Type-Options
- Errors in the console
- Clickjacking mitigation
- Paste preventing inputs
- Hypertext Transfer Protocol Secure (HTTPS)
- Sponsored top-level domain (sTLD)
Grades/scores
ScanGov
About this ranking
About this data
ScanGov scans the homepage of each county site on our county list in Missouri. 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.