The Civic Record
County · Iowa

Marshall County

Marshall County

Marshall County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 40,105, and was estimated to be 39,890 in 2025. The county seat and largest city is Marshalltown. The county was formed on January 13, 1846, and named after John Marshall, Chief Justice of the United States Supreme Court. Marshall County comprises the Marshalltown, Iowa Micropolitan Statistical Area. In 2010, the center of population of Iowa was located in Marshall County, near Melbourne.

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39,853 population (2021) · County area: Marshall · Official website

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Cities and towns 13

Reference data (Census of Governments 2022)
Census ID (PID6)
126550
FIPS state
19
FIPS county
127
FIPS place
99127
Census record name
COUNTY OF MARSHALL
Mailing address
1 E MAIN ST, MARSHALLTOWN 50158