• county
  • FIPS 29185
  • Largest town: Appleton City

St. Clair County, Missouri

St. Clair County had 9,848 residents in the Census Vintage 2024 estimate, on 675.0 square miles of land. It ranks 87th of 115 in Missouri by population and 35th by land area.

Population
9,848
#87 of 115 in Missouri · #2,420 in US
Area
675.0 sq mi
#35 of 115 in Missouri · #1,395 in US
Density
15 / sq mi
#93 of 115 in Missouri · #2,410 in US
Median household income
$50,578
#91 of 115 in Missouri · #2,681 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

St. Clair County within Missouri. Pin: Jefferson City.

Measure from here

Tools and pages that start from St. Clair County

St. Clair County population, land area and income

St. Clair County had 9,848 residents in the Census Vintage 2024 estimate, on 675.0 square miles of land. It ranks 87th of 115 in Missouri by population and 35th by land area. That works out to 14.6 people per square mile, below the US average of 96.3, and in the bottom quarter nationally.

The median county-equivalent in Missouri has 19,100 residents; St. Clair County is somewhat smaller.

Its SAIPE 2023 median household income of $50,578 is in the bottom quarter among 3,143 counties with an estimate.

National rank among 3,144

Population

9,848

3144th1st

2420th of 3,144 (US)

Land area

675 sq mi

3144th1st

1395th of 3,144 (US)

Density

14.6 / sq mi

3144th1st

2410th of 3,144 (US)

Median household income

$50,578

3143rd1st

2681st of 3,143 (US)

Rank within Missouri (115)

Population

9,848

115th1st

87th of 115 (MO)

Land area

675 sq mi

115th1st

35th of 115 (MO)

Density

14.6 / sq mi

115th1st

93rd of 115 (MO)

Median household income

$50,578

115th1st

91st of 115 (MO)

How St. Clair County's population changed since 2020

St. Clair County gained 502 residents between the July 2020 and July 2024 estimates, a rise of 5.4%. That ranks 14th of 115 in Missouri for growth. The median Missouri county changed by +1.4%, and the state as a whole by +1.5%.

Since the April 2020 estimates base, St. Clair County recorded 474 births and 647 deaths, a natural change of -173. Net international migration added +23 and net domestic migration, people moving to or from other US counties, came to +713. The largest single component was domestic migration, which added 713 people.

9,34620209,41620219,58120229,74320239,8482024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
474
Deaths
647
Net international migration
+23
Net domestic migration
+713
Change, July 2023 to July 2024
+105

Where St. Clair County is

The Census internal point of St. Clair County is at 38.042200, -93.776600. It sits in UTM zone 15N. The map shades Missouri's 115 county-equivalents by population change from 2020 to 2024, darker for faster growth, with St. Clair County outlined. Dots are towns of 1,000+ people with residents in it.

Pettis County: +1.8%Henry County: +2.7%Texas County: +5.7%Madison County: +1.8%St. Louis city: -6.9%Cole County: +1.3%Washington County: +0.6%Macon County: -0.1%Barton County: +0.8%Grundy County: +0.1%Cedar County: +5.7%Randolph County: -1.6%Ray County: +0.3%Caldwell County: +2.0%Benton County: +6.1%Douglas County: +5.9%Shannon County: +3.4%Dade County: +0.5%Wright County: +7.1%Gentry County: +2.6%Lawrence County: +3.0%Cooper County: +2.9%Hickory County: +5.6%Moniteau County: +0.5%Dent County: +2.3%Monroe County: +2.3%Maries County: +0.7%Bollinger County: +0.5%Clinton County: +2.4%Knox County: +0.0%Webster County: +7.8%Harrison County: +0.4%Pulaski County: -0.1%Adair County: +1.5%Warren County: +7.7%Daviess County: +1.3%Audrain County: -1.9%Howard County: -0.1%Linn County: +0.4%Saline County: -0.1%Miller County: +3.6%Dallas County: +4.3%Morgan County: +6.7%New Madrid County: -6.8%Newton County: +4.8%Oregon County: +1.0%Franklin County: +2.3%Greene County: +2.9%Ralls County: +1.4%Lafayette County: +1.4%Livingston County: +4.8%McDonald County: +3.3%Barry County: +3.1%Cape Girardeau County: +2.2%Carroll County: -0.6%Christian County: +7.6%Vernon County: +0.6%Carter County: +3.0%Andrew County: -0.1%Jasper County: +2.9%Worth County: -4.9%Lincoln County: +10.1%Marion County: -0.2%Holt County: +1.2%Howell County: +2.4%St. Francois County: +1.6%Chariton County: +0.1%Butler County: -0.6%Iron County: -1.0%Perry County: +0.7%Cass County: +5.3%St. Louis County: -1.0%Dunklin County: -4.3%Wayne County: -1.1%Ozark County: +6.7%Laclede County: +1.9%Reynolds County: -2.5%Lewis County: -1.9%Taney County: +1.2%Ripley County: +0.4%Ste. Genevieve County: +0.4%Scotland County: -0.1%Putnam County: -3.1%Schuyler County: +1.5%Shelby County: -2.8%Boone County: +4.4%Mercer County: -1.7%Platte County: +5.6%Camden County: +3.1%Bates County: +2.1%Johnson County: +3.4%Sullivan County: -3.8%Atchison County: -3.1%Scott County: -0.2%Montgomery County: +2.0%Jefferson County: +2.2%Clark County: -0.5%Callaway County: +1.8%St. Clair County: +5.4%Buchanan County: -1.1%Pemiscot County: -7.6%Polk County: +4.6%Phelps County: +2.5%Stone County: +4.6%Osage County: +1.7%Clay County: +3.6%Nodaway County: -2.4%Crawford County: -1.0%Jackson County: +1.4%St. Charles County: +4.3%Mississippi County: -3.1%Pike County: +3.1%Stoddard County: -0.7%Gasconade County: -0.7%DeKalb County: -14.8%
Change 2020 to 2024
  1. < -0.7%
  2. < +0.5%
  3. < +2.0%
  4. < +3.6%
  5. ≥ +3.6%
no data

Orange pin: St. Clair County internal point. Dark pin: Jefferson City.

Internal point

Decimal
38.042200, -93.776600
DMS
38°02'31.92"N 93°46'35.76"W
UTM
15N 431855.2E 4210781.8N
Geohash
9yv26j3gy
Plus code
86C826RF+V9

Towns in St. Clair County

One incorporated place of 1,000+ people has residents in St. Clair County, 1,080 people together, or 11% of the county. Each figure counts only the part of the town inside St. Clair County; towns marked "part" extend into another county. The largest is Appleton City with 1,080.

  1. 01Appleton City1,080
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering St. Clair County

The Census 2024 county adjacency file lists 7 neighbors for St. Clair County. The most populous is Polk County, MO, with 33,070 residents. Distances run between Census internal points in a straight line.

Distance to Jefferson City and the nearest big city

Jefferson City is 94.5 miles ENE of St. Clair County's internal point in a straight line. The nearest place of 100,000 or more is Springfield, MO (population 170,596), 64.3 miles away. The nearest place of 10,000 or more is Bolivar, MO (population 11,549), 35.9 miles away.

St. Clair County FIPS code

The FIPS code of St. Clair County is 29185: state code 29 for Missouri plus county code 185. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $50,578.

Questions people ask

What is the population of St. Clair County, Missouri?

The Census Vintage 2024 estimate for July 1, 2024 is 9,848. That is up 502 people (5.4%) from the July 2020 estimate of 9,346.

What is the FIPS code of St. Clair County?

29185. The first two digits (29) are Missouri; the last three (185) identify the county.

What is the largest town in St. Clair County?

Appleton City, with 1,080 residents inside St. Clair County in 2024.

Which counties border St. Clair County?

7 county-equivalents border it in the Census 2024 adjacency file: Polk County, MO; Henry County, MO; Benton County, MO; Vernon County, MO; Bates County, MO; Cedar County, MO; Hickory County, MO.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.