San Gabriel / Pomona Regional Center serves 30 cities in the Foothill, Pomona, and El Monte Health Districts.
These include the following cities, communities and postal zip codes:
- Altadena — 91001
- Arcadia — 91006, 91007
- Azusa — 91702
- Baldwin Park — 91706
- Bassett — 91746
- Bradbury — 91010
- Charter Oak — 91724
- City of Industry — 91744, 91745, 91746
- Claremont — 91711
- Covina — 91722, 91723, 91724
- Diamond Bar — 91765
- Duarte — 91010
- El Monte — 91731, 91732
- Glendora — 91740, 91741
- Hacienda Heights — 91745
- Irwindale — 91706
- La Puente — 41744, 91745
- La Verne — 91750
- Monrovia — 91016
- Pasadena* — 91104, 91107
- Pomona* — 91766, 91767, 71768 (91766 known as Phillips Ranch)
- Rowland Heights — 91748
- San Dimas — 91773
- Sierra Madre — 91024
- South El Monte — 91733
- Temple City* — 91780
- Valinda — 91744
- Walnut — 91789
- West Covina — 91790, 91791, 91792
- Whittier* — 90601
*Portions of Pasadena, Pomona, Temple City and Whittier according to the L.A. County Health Districts: El Monte, Foothill & Pomona, are shared with another Regional Center.