Mercer is a town in Mercer County, Missouri, home to about 325 people across 0.4 square miles. Its ZIP code is 64661.
Mostly Mercer; also South Lineville
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| Nearest major airport | Des Moines International Airport (DSM)71 miles away |
|---|---|
| Closer regional airport | Kirksville Regional Airport (IRK)59 miles away |
| Nearest city of 250,000+ | Kansas City, MO110 miles away |
| Nearest city of 1 million+ | Chicago, IL317 miles away |
Straight-line distances from the center of Mercer; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Mercer had 263 residents in the 2020 census, down 23% since 2000.
It’s the 620th largest of 1,060 towns in Missouri by population.
Mercer County grew from 14,706 residents in 1900 to 3,538 in 2020.
Mercer County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 86°F in summer, and winter lows average 15°F. About 38 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Princeton, MO weather station (9 miles away).
384 jobs at 79 businesses in Mercer County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
Nearest hospitals
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances.
Parks (3 nearby)
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by North Mercer Co. R-III. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| North Mercer Elem.Mercer | Pre-K–6 | 84 | Public | 0.4 mi |
| Mercer HighMercer | 7–12 | 58 | Public | 0.4 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Poverty Ridge Amish SchoolMercer | 2–8 | 8 | Amish | 5.7 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with South Lineville.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.