Massachusetts' 3rd Congressional District
Massachusetts · MA-03
Massachusetts' 3rd Congressional District is one of 9 U.S. House districts in Massachusetts, represented in Congress by Lori Trahan (Democrat). It is home to roughly 782,860 people, with a median age of 39.3. The population is about 61% White. The median household income is $98,140, and 40% of adults 25 and older hold a bachelor’s degree or higher. In the 2024 presidential election it voted solidly Democratic (D+19).
Representative
Current U.S. House member (source: house.gov).
Geography
MA-03 is shown in red. Click a neighboring district to open it, or zoom out to explore the country.
Covering 778 square miles, MA-03 is the 291st-largest of the 435 congressional districts by land area. With about 1,006 residents per square mile, it is a largely suburban district. Its shape is irregular: the district's Polsby-Popper score of 0.24 ranks 265th of 435 nationally, where 1st is the most compact.
Presidential results
In the 2024 presidential election, 58% of MA-03 voters backed Kamala Harris and 39% Donald Trump — a D+19 margin. That is a 8.0-point shift toward the Republicans from 2020, when the district voted D+27.
Two-party presidential vote by district (source: The Downballot).
Who lives here
The median resident of the district is 39.3 years old; 21.9% of residents are under 18 and 15.3% are 65 or older. About 20.2% of residents were born outside the United States, and 31.1% speak a language other than English at home.
U.S. Census Bureau, American Community Survey (5-year estimates).
Economy & education
At $98,140, the district's median household income ranks 79th of 435 districts nationwide. The typical owner-occupied home is worth $467,839, and the median rent is $1,563 a month. 9.8% of residents live below the poverty line, and workers average a 31.2-minute commute (15.1% work from home).
U.S. Census Bureau, American Community Survey (5-year estimates).