California's 48th Congressional District
California · CA-48
California's 48th Congressional District is one of 52 U.S. House districts in California, represented in Congress by Darrell Issa (Republican). It is home to roughly 756,939 people, with a median age of 38.3. The population is about 42% White. The median household income is $91,203, and 31% of adults 25 and older hold a bachelor’s degree or higher. In the 2024 presidential election it voted solidly Republican (R+15).
Representative
Current U.S. House member (source: house.gov).
Geography
CA-48 is shown in red. Click a neighboring district to open it, or zoom out to explore the country.
Covering 3,002 square miles, CA-48 is the 194th-largest of the 435 congressional districts by land area. With about 252 residents per square mile, it is a mix of small cities, suburbs and countryside. Its shape is very irregular: the district's Polsby-Popper score of 0.12 ranks 391st of 435 nationally, where 1st is the most compact.
Presidential results
In the 2024 presidential election, 41% of CA-48 voters backed Kamala Harris and 56% Donald Trump — a R+15 margin. That is a 3.0-point shift toward the Republicans from 2020, when the district voted R+12.
Two-party presidential vote by district (source: The Downballot).
Who lives here
The median resident of the district is 38.3 years old; 24% of residents are under 18 and 16.6% are 65 or older. About 20.5% of residents were born outside the United States, and 33.9% speak a language other than English at home.
U.S. Census Bureau, American Community Survey (5-year estimates).
Economy & education
At $91,203, the district's median household income ranks 116th of 435 districts nationwide. The typical owner-occupied home is worth $600,126, and the median rent is $1,960 a month. 10.7% of residents live below the poverty line, and workers average a 34.2-minute commute (14.7% work from home).
U.S. Census Bureau, American Community Survey (5-year estimates).