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Marion County, MO
3 cities and towns and 5 ZIP codes in Marion County, Missouri.
Population
28,457
Land area
437sq mi
People per sq mi
65
ZIP codes
5
Cities and towns in Marion County
Marion County at a glance
- Marion County is 28% less dense than Missouri as a whole.
- Households here earn a median of $62,903 a year, 11% less than the Missouri figure of $70,702.
- A typical owner-occupied home is valued at $162,000 (30% below Missouri) and median rent is $808 a month.
- The biggest population centers are Hannibal (16,771), Palmyra (3,623) and Philadelphia (219).
Local data for Marion County, MO
Counts from official public data
- Hospitals1
- Emergency Rooms1
- Nursing Homes4
- Schools17
- Colleges1
- Libraries2
- Banks19
- Post Offices2
- Parks18
- Grocery Stores7
- Restaurants82
- Affordable Housing3
- Home Health Agencies1
- Dialysis Centers1
- Rehab & Long-Term Care Hospitals1
- Community Health Centers5
- Mental Health & Addiction Treatment5
- Private Schools2
- Toxic Release Facilities3
- Historic Places29
Housing and community stats
Marion County, MO, American Community Survey 2020-2024
Median household income
$62,903
Poverty rate
14.2%
Median home value
$162,000
Prices +9.1% in a year
Median rent
$808/mo
Homeownership
69.3%
Bachelor's or higher
24.6%
Median age
39.6
Average commute
17.6 min
Largest reported origins and ancestries: German Americans (6,524), Irish Americans (2,694), Italian Americans (969).
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
3.9%
Aug 2026, -0.6 pts in a year
Average annual pay
$53,464
12,987 jobs, 2025
Income per person
$54,254
BEA, 2024
Federal spending
$193M
FY 2026, $6,765 per person
PPP loans
$53.2M
1,134 loans, 7,751 jobs reported
Campaign donations
$44.9K
Itemized, 2026 cycle
How people get to work
Marion County, MO, workers 16 and older. American Community Survey 5-year estimates
- Drove alone77.5%
- Carpooled9.5%
- Public transit0.3%
- Walked4.3%
- Bicycle0.1%
- Taxi, ride-hailing, motorcycle or other1.1%
- Worked from home7.3%
Average one-way commute: 17.6 minutes for people who do not work from home.
Environment and hazard risk
Marion County, MO, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Low
Top: heat wave
Storm events since 1996
357
Most often thunderstorm wind
Flood insurance policies
50
0.4% of homes, county
July high / Jan low
87° / 19°F
36.5 inches of rain a year
Hazards, floods and storm historyCheck a flood zone29 historic places
Health statistics
Share of adults in Marion County, MO, CDC PLACES estimates
Obesity
39.6%
U.S. 33.3% +6.3 pts
Diabetes
12.8%
U.S. 12.1% +0.7 pts
Smoking
17.3%
U.S. 12.8% +4.5 pts
Uninsured (18-64)
8.8%
U.S. 11.1% -2.3 pts
Cities, towns and ZIP codes in Marion County
Population shown
Frequently asked questions
- What is the largest city in Marion County, MO?
- Hannibal is the largest city or town in Marion County, with about 16,771 residents.
- How many ZIP codes are in Marion County?
- Marion County includes 5 ZIP Code Tabulation Areas, including 63401, 63454, 63461, 63463, 63471.
- What is the population of Marion County, MO?
- About 28,457 people live in Marion County, based on American Community Survey 5-year estimates.
- What counties border Marion County?
- Marion County borders Adams County, IL, Pike County, IL, Ralls County, Lewis County, Monroe County, Shelby County.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023