California's 1st congressional district is a U.S. congressional district in California. Doug LaMalfa, a Republican, has represented the district since January 2013. Currently, it encompasses the northeastern part of the state. Since the 2022 election, it includes the counties of Butte, Colusa, Glenn, Lassen, Modoc, Shasta, Siskiyou, Sutter, and Tehama, and most of Yuba County. The largest cities in the district are Chico, Redding, and Yuba City. Prior to redistricting in 2021, it included the counties of Butte, Lassen, Modoc, Plumas, Shasta, Sierra, Siskiyou, and Tehama, most of Nevada County, part of Glenn County, and part of Placer County. In the 2021 redistricting, it added the Yuba–Sutter area and removed most of its share of the Sierra Nevada.

Competitiveness

Prior to 2013, the GOP last held the seat in 1998 when U.S. Representative Frank Riggs decided to run for the U.S. Senate. Riggs was replaced by long-time Democratic Assemblyman and State Senator Mike Thompson. Redistricting in 2001 added Democratic-leaning areas of Yolo County. John Kerry won the district in 2004 presidential election with 59.7% of the vote. Barack Obama carried the district in 2008 presidential election with 65.60% of the vote. The redistricting after the 2010 census made the district much more Republican-leaning; Mitt Romney and Donald Trump won the district by double digits in 2012, 2016, and 2020 respectively.

Election results from statewide races

Composition

Since the 2020 redistricting, California's 1st district is located in northeastern California. It encompasses Butte, Colusa, Glenn, Lassen, Modoc, Shasta, Siskiyou, Sutter, and Tehama Counties, as well as part Yuba County. Yuba County is split between this district and the 3rd district. They are partitioned by State Highway 70, Ellis Rd, and Union Pacific. The 1st district takes in the city of Marysville and the surrounding census-designated areas.

Cities and CDPs with 10,000 or more people

2,500 – 10,000 people

List of members representing the district

Election results

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