The Countywide Oversight Board of Orange County provides oversight for 25 successor agencies, the second most of any Countywide Oversight Board in the State of California. The 25 successor agencies are:
 City of Anaheim |
 City of Brea |
 City of Buena Park |
 City of Costa Mesa |
 County of Orange |
 City of Cypress |
 City ofFountain Valley |
 City of Fullerton |
 City of Garden Grove |
 City ofHuntington Beach |
 City of Irvine |
 City of La Habra |
 City of La Palma |
 City of Lake Forest |
 City of Mission Viejo |
 City of Orange |
 City of Placentia |
 City of San Clemente |
 City ofSan Juan Capistrano |
 City of Santa Ana |
 City of Seal Beach |
 City of Stanton |
 City of Tustin |
 City of Westminster |
 City of Yorba Linda |