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Sullivan County, MO
9 cities and towns and 6 ZIP codes in Sullivan County, Missouri.
Population
5,857
Land area
648sq mi
People per sq mi
9
ZIP codes
6
Cities and towns in Sullivan County
Sullivan County at a glance
- Sullivan County is 90% less dense than Missouri as a whole.
- Households here earn a median of $56,964 a year, 19% less than the Missouri figure of $70,702.
- A typical owner-occupied home is valued at $115,600 (50% below Missouri) and median rent is $673 a month.
- The biggest population centers are Milan (1,859), Green City (658) and Green Castle (332).
Local data for Sullivan County, MO
Counts from official public data
Housing and community stats
Sullivan County, MO, American Community Survey 2020-2024
Median household income
$56,964
Poverty rate
13.7%
Median home value
$115,600
Median rent
$673/mo
Homeownership
75.1%
Bachelor's or higher
15.5%
Median age
44.1
Average commute
19.6 min
Largest reported origins and ancestries: German Americans (651), Mexican Americans (500), Irish Americans (388).
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
4.5%
Aug 2026, +0.5 pts in a year
Average annual pay
$51,932
2,306 jobs, 2025
Income per person
$52,864
BEA, 2024
Federal spending
$38.5M
FY 2026, $6,412 per person
PPP loans
$9.3M
528 loans, 1,217 jobs reported
Campaign donations
$9,121
Itemized, 2026 cycle
How people get to work
Sullivan County, MO, workers 16 and older. American Community Survey 5-year estimates
- Drove alone74.6%
- Carpooled18.8%
- Public transit0.7%
- Walked0.9%
- Bicycle0.0%
- Taxi, ride-hailing, motorcycle or other0.4%
- Worked from home4.5%
Average one-way commute: 19.6 minutes for people who do not work from home.
Environment and hazard risk
Sullivan County, MO, from FEMA, NOAA and EPA
Natural hazard risk
Very Low
Top: landslide
Storm events since 1996
261
Most often hail
July high / Jan low
85° / 13°F
40.7 inches of rain a year
Toxic release facilities
1
No Superfund sites
Hazards, floods and storm historyCheck a flood zone5 historic places
Health statistics
Share of adults in Sullivan County, MO, CDC PLACES estimates
Obesity
40.1%
U.S. 33.3% +6.8 pts
Diabetes
15.1%
U.S. 12.1% +3.0 pts
Smoking
18.7%
U.S. 12.8% +5.9 pts
Uninsured (18-64)
13.2%
U.S. 11.1% +2.1 pts
Cities, towns and ZIP codes in Sullivan County
Population shown
Frequently asked questions
- What is the largest city in Sullivan County, MO?
- Milan is the largest city or town in Sullivan County, with about 1,859 residents.
- How many ZIP codes are in Sullivan County?
- Sullivan County includes 6 ZIP Code Tabulation Areas, including 63544, 63545, 63556, 63560, 64645.
- What is the population of Sullivan County, MO?
- About 5,857 people live in Sullivan County, based on American Community Survey 5-year estimates.
- What counties border Sullivan County?
- Sullivan County borders Adair County, Linn County, Grundy County, Putnam County, Mercer County.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023