• county
  • FIPS 29221
  • Largest town: Potosi

Washington County, Missouri

Washington County had 23,583 residents in the Census Vintage 2024 estimate, on 759.9 square miles of land. It ranks 47th of 115 in Missouri by population and 17th by land area.

Population
23,583
#47 of 115 in Missouri · #1,660 in US
Area
759.9 sq mi
#17 of 115 in Missouri · #1,150 in US
Density
31 / sq mi
#56 of 115 in Missouri · #1,892 in US
Median household income
$49,510
#95 of 115 in Missouri · #2,743 in US

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

Washington County within Missouri. Pin: Jefferson City.

Measure from here

Tools and pages that start from Washington County

Washington County population, land area and income

Washington County had 23,583 residents in the Census Vintage 2024 estimate, on 759.9 square miles of land. It ranks 47th of 115 in Missouri by population and 17th by land area. That works out to 31.0 people per square mile, below the US average of 96.3, and below the national county median.

The median county-equivalent in Missouri has 19,100 residents; Washington County is somewhat larger.

Its SAIPE 2023 median household income of $49,510 is in the bottom quarter among 3,143 counties with an estimate.

National rank among 3,144

Population

23,583

3144th1st

1660th of 3,144 (US)

Land area

760 sq mi

3144th1st

1150th of 3,144 (US)

Density

31.0 / sq mi

3144th1st

1892nd of 3,144 (US)

Median household income

$49,510

3143rd1st

2743rd of 3,143 (US)

Rank within Missouri (115)

Population

23,583

115th1st

47th of 115 (MO)

Land area

760 sq mi

115th1st

17th of 115 (MO)

Density

31.0 / sq mi

115th1st

56th of 115 (MO)

Median household income

$49,510

115th1st

95th of 115 (MO)

How Washington County's population changed since 2020

Washington County gained 151 residents between the July 2020 and July 2024 estimates, a rise of 0.6%. That ranks 68th 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, Washington County recorded 1,108 births and 1,587 deaths, a natural change of -479. Net international migration added +20 and net domestic migration, people moving to or from other US counties, came to +539. The largest single component was domestic migration, which added 539 people.

23.4k202023.4k202123.4k202223.5k202323.6k2024
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
1,108
Deaths
1,587
Net international migration
+20
Net domestic migration
+539
Change, July 2023 to July 2024
+41

Where Washington County is

The Census internal point of Washington County is at 37.942600, -90.897000. 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 Washington 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: Washington County internal point. Dark pin: Jefferson City.

Internal point

Decimal
37.942600, -90.897000
DMS
37°56'33.36"N 90°53'49.20"W
UTM
15N 684791.8E 4201532.2N
Geohash
9yxrge4zd
Plus code
869FW4V3+26

Towns in Washington County

One incorporated place of 1,000+ people has residents in Washington County, 2,549 people together, or 11% of the county. Each figure counts only the part of the town inside Washington County; towns marked "part" extend into another county. The largest is Potosi with 2,549.

  1. 01Potosi2,549
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Washington County

The Census 2024 county adjacency file lists 5 neighbors for Washington County. The most populous is Jefferson County, MO, with 231,888 residents. Distances run between Census internal points in a straight line.

Distance to Jefferson City and the nearest big city

Jefferson City is 82.0 miles WNW of Washington County's internal point in a straight line. The nearest place of 100,000 or more is St. Louis, MO (population 279,695), 59.5 miles away. The nearest place of 10,000 or more is Farmington, MO (population 19,165), 27.9 miles away.

Washington County FIPS code

The FIPS code of Washington County is 29221: state code 29 for Missouri plus county code 221. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $49,510.

Questions people ask

What is the population of Washington County, Missouri?

The Census Vintage 2024 estimate for July 1, 2024 is 23,583. That is up 151 people (0.6%) from the July 2020 estimate of 23,432.

What is the FIPS code of Washington County?

29221. The first two digits (29) are Missouri; the last three (221) identify the county.

What is the largest town in Washington County?

Potosi, with 2,549 residents inside Washington County in 2024.

Which counties border Washington County?

5 county-equivalents border it in the Census 2024 adjacency file: Jefferson County, MO; Franklin County, MO; St. Francois County, MO; Crawford County, MO; Iron 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.