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Mercer County, MO
4 cities and towns and 2 ZIP codes in Mercer County, Missouri.
Population
3,482
Land area
454sq mi
People per sq mi
8
ZIP codes
2
Cities and towns in Mercer County
Mercer County at a glance
- Mercer County is 91% less dense than Missouri as a whole.
- Households here earn a median of $62,679 a year, 11% less than the Missouri figure of $70,702.
- A typical owner-occupied home is valued at $104,900 (54% below Missouri) and median rent is $590 a month.
- The biggest population centers are Princeton (1,352), Mercer (325) and Ravanna (68).
Local data for Mercer County, MO
Counts from official public data
Housing and community stats
Mercer County, MO, American Community Survey 2020-2024
Median household income
$62,679
Poverty rate
13.5%
Median home value
$104,900
Median rent
$590/mo
Homeownership
81.0%
Bachelor's or higher
18.1%
Median age
42.4
Average commute
22.6 min
Largest reported origins and ancestries: German Americans (497), Irish Americans (298), Mexican Americans (123).
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
2.8%
Sep 2026, -0.4 pts in a year
Average annual pay
$46,712
804 jobs, 2025
Income per person
$44,616
BEA, 2024
Federal spending
$36.5M
FY 2026, $10,305 per person
PPP loans
$5.2M
301 loans, 562 jobs reported
Campaign donations
$2,048
Itemized, 2026 cycle
How people get to work
Mercer County, MO, workers 16 and older. American Community Survey 5-year estimates
- Drove alone73.0%
- Carpooled10.4%
- Public transit0.4%
- Walked1.2%
- Bicycle1.4%
- Taxi, ride-hailing, motorcycle or other0.3%
- Worked from home13.2%
Average one-way commute: 22.6 minutes for people who do not work from home.
Environment and hazard risk
Mercer County, MO, from FEMA, NOAA and EPA
Natural hazard risk
Very Low
Top: landslide
Storm events since 1996
255
Most often hail
July high / Jan low
86° / 15°F
38.0 inches of rain a year
Hazards, floods and storm historyCheck a flood zone1 historic places
Health statistics
Share of adults in Mercer County, MO, CDC PLACES estimates
Obesity
41.1%
U.S. 33.3% +7.8 pts
Diabetes
15.6%
U.S. 12.1% +3.5 pts
Smoking
20.0%
U.S. 12.8% +7.2 pts
Uninsured (18-64)
10.5%
U.S. 11.1% -0.6 pts
Cities, towns and ZIP codes in Mercer County
Population shown
Frequently asked questions
- What is the largest city in Mercer County, MO?
- Princeton is the largest city or town in Mercer County, with about 1,352 residents.
- How many ZIP codes are in Mercer County?
- Mercer County includes 2 ZIP Code Tabulation Areas, including 64661, 64673.
- What is the population of Mercer County, MO?
- About 3,482 people live in Mercer County, based on American Community Survey 5-year estimates.
- What counties border Mercer County?
- Mercer County borders Grundy County, Harrison County, Decatur County, IA, Wayne County, IA, Sullivan County, Putnam County.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023