Missouri's 3rd Congressional District
Missouri · MO-03
Missouri's 3rd Congressional District is one of 8 U.S. House districts in Missouri, represented in Congress by Robert Onder (Republican). It is home to roughly 783,375 people, with a median age of 38. The population is about 84% White. The median household income is $86,688, and 38% of adults 25 and older hold a bachelor’s degree or higher. In the 2024 presidential election it voted solidly Republican (R+27).
Representative
Current U.S. House member (source: house.gov).
Geography
MO-03 is shown in red. Click a neighboring district to open it, or zoom out to explore the country.
Covering 5,918 square miles, MO-03 is the 125th-largest of the 435 congressional districts by land area. With about 132 residents per square mile, it is a predominantly rural district. Its shape is fairly compact: the district's Polsby-Popper score of 0.39 ranks 92nd of 435 nationally, where 1st is the most compact.
Presidential results
In the 2024 presidential election, 36% of MO-03 voters backed Kamala Harris and 63% Donald Trump — a R+27 margin. That is a 1.0-point shift toward the Republicans from 2020, when the district voted R+26.
Two-party presidential vote by district (source: The Downballot).
Who lives here
The median resident of the district is 38 years old; 22.2% of residents are under 18 and 16% are 65 or older. About 3.9% of residents were born outside the United States, and 5.6% speak a language other than English at home.
U.S. Census Bureau, American Community Survey (5-year estimates).
Economy & education
At $86,688, the district's median household income ranks 149th of 435 districts nationwide. The typical owner-occupied home is worth $267,005, and the median rent is $1,111 a month. 9.4% of residents live below the poverty line, and workers average a 25.7-minute commute (12.3% work from home).
U.S. Census Bureau, American Community Survey (5-year estimates).