Westminster is a city in Orange County,  California.  Westminster was incorporated in 1957, at which time it had 10,755 residents. Originally, the city was named Tri-City because it was the amalgamation of three cities: Westminster, Barber City, and Midway City. Midway City ultimately turned down incorporation, leaving Barber City to be absorbed into the newly incorporated Westminster. The former Barber City was located in the western portion of the current City of Westminster.  When completing appraisals in Westminster, it is important to know the area because Westminster is landlocked and bordered by Seal Beach on the west, by Garden Grove on the north and east, and by Huntington Beach and Fountain Valley on the south.

Westminster surrounds the unincorporated area of Midway City, except for a small portion where Midway City meets Huntington Beach to the south.

A large number of Vietnamese refugees came to the city in the 1970s, settling largely in an area now officially named Little Saigon. As of the 2000 census, the city had a total population of 88,207.