The 1st federal electoral district of Baja California () is one of the 300 electoral districts into which Mexico is divided for elections to the federal Chamber of Deputies and one of nine such districts in the state of Baja California.
It elects one deputy to the lower house of Congress for each three-year legislative session by means of the first-past-the-post system. Votes cast in the district also count towards the calculation of proportional representation ("plurinominal") deputies elected from the first region.
The current member for the district, elected in the 2024 general election, is Alma Laura Ruiz López of the National Regeneration Movement (Morena).
Under the 2023 districting plan adopted by the National Electoral Institute (INE), which is to be used for the 2024, 2027 and 2030 federal elections, the first district covers 203 precincts () in the eastern urban portion of the municipality of Mexicali.
The head town (), where results from individual polling stations are gathered together and tallied, is the state capital, the city of Mexicali. The district reported a population of 393,457 in the 2020 Census.
2005âÂÂ2017
1996âÂÂ2005