County · Missouri

Marion County

Marion County is a county located in the northeastern portion of Missouri. As of the 2020 census, the population was 28,525. Its county seat is Palmyra. Unique from most third-class counties in the state, Marion has two county courthouses, the second located in Hannibal. The county was organized on December 23, 1826, and named for General Francis Marion, the "Swamp Fox," who was from South Carolina and served in the American Revolutionary War. The area was known as the "Two Rivers Country" before organization. Marion County is part of the Hannibal, Missouri Micropolitan Statistical Area, which is included in the Quincy-Hannibal, IL-MO Combined Statistical Area.

Governance bodies

County Commission Primary
governing council

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Cities and towns 2

Reference data (Census of Governments 2022)

Census ID (PID6): 190661
FIPS state: 29
FIPS county: 127
FIPS place: 99127
Census record name: COUNTY OF MARION
Mailing address: 100 S MAIN ST, PALMYRA 63461