1st federal electoral district of Baja California

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. == Previous districting schemes ==

2005–2017 :Under the 2005 redistricting process, it was made up of the municipality of Mexicali, with the exception of its extreme northwest (where the state's 3rd district was located) and its extreme northeast (which corresponded to the 2nd district). The district's head town was the city of Mexicali. ==Deputies returned to Congress ==