The first Supervisorial district includes the cities of Garden Grove, Santa Ana, Westminster, unincorporated Midway City, as well as parts of Fountain Valley. The first Supervisorial district is 42% Democratic and 24% Republican by registration – making it one of the most flippable major local offices in California.

In the 2020 1st District Primary results, Sergio Contreras won 22.47% of the vote. The results show that residents of the 1st District are ready for new leadership; 57% of the voters in this election voted against the incumbent.