• county
  • FIPS 29127
  • Largest town: Hannibal

Marion County, Missouri

Marion County had 28,425 residents in the Census Vintage 2024 estimate, on 436.9 square miles of land. It ranks 39th of 115 in Missouri by population and 97th by land area.

Population
28,425
#39 of 115 in Missouri · #1,492 in US
Area
436.9 sq mi
#97 of 115 in Missouri · #2,320 in US
Density
65 / sq mi
#29 of 115 in Missouri · #1,237 in US
Median household income
$60,780
#37 of 115 in Missouri · #1,762 in US

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

Marion County within Missouri. Pin: Jefferson City.

Measure from here

Tools and pages that start from Marion County

Marion County population, land area and income

Marion County had 28,425 residents in the Census Vintage 2024 estimate, on 436.9 square miles of land. It ranks 39th of 115 in Missouri by population and 97th by land area. That works out to 65.1 people per square mile, below the US average of 96.3, and above the national county median.

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

Its SAIPE 2023 median household income of $60,780 is below the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

28,425

3144th1st

1492nd of 3,144 (US)

Land area

437 sq mi

3144th1st

2320th of 3,144 (US)

Density

65.1 / sq mi

3144th1st

1237th of 3,144 (US)

Median household income

$60,780

3143rd1st

1762nd of 3,143 (US)

Rank within Missouri (115)

Population

28,425

115th1st

39th of 115 (MO)

Land area

437 sq mi

115th1st

97th of 115 (MO)

Density

65.1 / sq mi

115th1st

29th of 115 (MO)

Median household income

$60,780

115th1st

37th of 115 (MO)

How Marion County's population changed since 2020

Marion County lost 68 residents between the July 2020 and July 2024 estimates, a drop of 0.2%. That ranks 88th 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, Marion County recorded 1,389 births and 1,667 deaths, a natural change of -278. Net international migration added +80 and net domestic migration, people moving to or from other US counties, came to +91. The largest single component was natural change, which removed 278 people.

28.5k202028.6k202128.5k202228.3k202328.4k2024
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
1,389
Deaths
1,667
Net international migration
+80
Net domestic migration
+91
Change, July 2023 to July 2024
+113

Where Marion County is

The Census internal point of Marion County is at 39.807500, -91.635400. 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 Marion 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: Marion County internal point. Dark pin: Jefferson City.

Internal point

Decimal
39.807500, -91.635400
DMS
39°48'27.00"N 91°38'7.44"W
UTM
15N 616810.3E 4407282.6N
Geohash
9znf6y9pk
Plus code
86FCR957+2R

Towns in Marion County

3 incorporated places of 1,000+ people have residents in Marion County, 20,677 people together, or 73% of the county. Each figure counts only the part of the town inside Marion County; towns marked "part" extend into another county. The largest is Hannibal with 16,523.

  1. 01Hannibal (part)16,523
  2. 02Palmyra3,644
  3. 03Monroe City (part)510
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Marion County

The Census 2024 county adjacency file lists 6 neighbors for Marion County, including 2 across a state line. The most populous is Adams County, IL, with 64,109 residents. Distances run between Census internal points in a straight line.

Distance to Jefferson City and the nearest big city

Jefferson City is 89.6 miles SSW of Marion County's internal point in a straight line. The nearest place of 100,000 or more is Columbia, MO (population 130,900), 70.0 miles away. The nearest place of 10,000 or more is Hannibal, MO (population 16,809), 14.5 miles away.

Marion County FIPS code

The FIPS code of Marion County is 29127: state code 29 for Missouri plus county code 127. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $60,780.

Questions people ask

What is the population of Marion County, Missouri?

The Census Vintage 2024 estimate for July 1, 2024 is 28,425. That is down 68 people (0.2%) from the July 2020 estimate of 28,493.

What is the FIPS code of Marion County?

29127. The first two digits (29) are Missouri; the last three (127) identify the county.

What is the largest town in Marion County?

Hannibal, with 16,523 residents inside Marion County in 2024 (16,809 across all 2 counties it spans).

Which counties border Marion County?

6 county-equivalents border it in the Census 2024 adjacency file: Adams County, IL; Pike County, IL; Ralls County, MO; Lewis County, MO; Monroe County, MO; Shelby 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.