Marshall County, IA — Demographics & Population
Population, age distribution, race & ethnicity, and education data
Population Overview
Source: Census Bureau ACS (2023)Total Population
39,971
Male
20,301
50.8%
Female
19,670
49.2%
Median Age
38.7 yrs
Avg Household Size
2.5
Foreign Born
14.0%
Race & Ethnicity
Source: Census Bureau ACS (2023)Age Distribution
Source: Census Bureau ACS (2023)Education
Source: Census Bureau ACS (2023)Bachelor's or Higher14.2%
High School or Higher37.1%
Other Demographics
Source: Census Bureau ACS (2023)Veterans
6.6%
Disability
0.0%
Non-English Home
8.6%
Married
43.6%
Marshall County, IA has a population of 39,971 according to 2023 Census Bureau estimates. The median age is 38.7 years. The largest racial or ethnic group is White at 74.6% of the population. 14.2% of residents hold a bachelor's degree or higher. 14.0% of residents are foreign-born.