The U.S. Post Office Calls Us Whittier

If you use Google Maps to zoom in and get a street address from a location in what Google calls East La Mirada, then put that street address and a zip code (use 90604) into this tool from the U.S. Postal Service,  USPS will return a full mailing address with a city name of Whittier. Admittedly that's not the same as East Whittier, but it's certainly not East La Mirada.