orange_county,_california | ispartof | greater_los_angeles_area <sep> orange county, often known by its initials oc, is located in the los angeles metropolitan area in southern california as of the 2020 census, the population was 3,186,989, making it the third-most-populous county in california, the sixth-most-populous in the united states, and more populous than 19 american states and washington, dc although largely suburban, it is the second-most-densely-populated county in the state behind san francisco county the county's three most-populous cities are anaheim, santa ana, and irvine, each of which has a population exceeding 300,000 santa ana is also the county seat 
orange county. is part of the greater los angeles area. in california.orange county is located in the los angeles area in southern california