Illinois' 15th Congressional District
Illinois · IL-15
Illinois' 15th Congressional District is one of 17 U.S. House districts in Illinois, represented in Congress by Mary Miller (Republican). It is home to roughly 740,094 people, with a median age of 42.2. The population is about 90% White. The median household income is $71,257, and 26% of adults 25 and older hold a bachelor’s degree or higher. In the 2024 presidential election it voted safely Republican (R+40).
Representative
Current U.S. House member (source: house.gov).
Geography
IL-15 is shown in red. Click a neighboring district to open it, or zoom out to explore the country.
Covering 16,970 square miles, IL-15 is the 46th-largest of the 435 congressional districts by land area. With about 44 residents per square mile, it is a predominantly rural district. Its shape is very irregular: the district's Polsby-Popper score of 0.13 ranks 386th of 435 nationally, where 1st is the most compact.
Presidential results
In the 2024 presidential election, 29% of IL-15 voters backed Kamala Harris and 69% Donald Trump — a R+40 margin. That is a 1.0-point shift toward the Republicans from 2020, when the district voted R+39.
Two-party presidential vote by district (source: The Downballot).
Who lives here
The median resident of the district is 42.2 years old; 21.6% of residents are under 18 and 20.4% are 65 or older. About 2% of residents were born outside the United States, and 4% speak a language other than English at home.
U.S. Census Bureau, American Community Survey (5-year estimates).
Economy & education
At $71,257, the district's median household income ranks 276th of 435 districts nationwide. The typical owner-occupied home is worth $146,274, and the median rent is $810 a month. 10.6% of residents live below the poverty line, and workers average a 23.9-minute commute (8.4% work from home).
U.S. Census Bureau, American Community Survey (5-year estimates).