| Prefix | Primary City |
|---|---|
| 657-200 | Westminster |
| 657-201 | Anaheim |
| 657-202 | Anaheim |
| 657-203 | Huntington Beach |
| 657-204 | Huntington Beach |
| 657-205 | Santa Ana |
| 657-206 | Garden Grove |
| 657-207 | Anaheim |
| 657-208 | Anaheim |
| 657-210 | Santa Ana |
| 657-212 | Santa Ana |
| 657-214 | Cypress |
| 657-215 | Huntington Beach |
| 657-216 | Placentia |
| 657-217 | Fullerton |
| 657-218 | Santa Ana |
| 657-219 | Santa Ana |
| 657-220 | Anaheim |
| 657-221 | Orange |
| 657-222 | Cypress |
| 657-223 | Orange |
| 657-224 | Orange |
| 657-225 | Fullerton |
| 657-226 | Placentia |
| 657-227 | Lakewood |
| 657-228 | Santa Ana |
| 657-229 | Santa Ana |
| 657-230 | Anaheim |
| 657-231 | Anaheim |
| 657-232 | Anaheim |
| 657-233 | Garden Grove |
| 657-234 | Yorba Linda |
| 657-235 | Santa Ana |
| 657-236 | Orange |
| 657-237 | Huntington Beach |
| 657-238 | Cypress |
| 657-239 | Buena Park |
| 657-240 | Santa Ana |
| 657-241 | Anaheim |
| 657-242 | Anaheim |
| 657-243 | Fullerton |
| 657-244 | Huntington Beach |
| 657-245 | Santa Ana |
| 657-246 | California |
| 657-247 | Santa Ana |
| 657-248 | Fullerton |
| 657-249 | Santa Ana |
| 657-250 | Garden Grove |
| 657-251 | Garden Grove |
| 657-252 | Buena Park |
| 657-253 | Fullerton |
| 657-254 | Anaheim |
| 657-255 | Buena Park |
| 657-256 | Cypress |
| 657-257 | Orange |
| 657-258 | Placentia |
| 657-259 | Huntington Beach |
| 657-260 | Silverado |
| 657-261 | Santa Ana |
| 657-262 | Anaheim |
| 657-263 | Garden Grove |
| 657-264 | Santa Ana |
| 657-265 | Santa Ana |
| 657-266 | Anaheim |
| 657-268 | Santa Ana |
| 657-269 | Anaheim |
| 657-271 | Anaheim |
| 657-272 | Anaheim |
| 657-273 | Santa Ana |
| 657-274 | Orange |
| 657-275 | Orange |
| 657-276 | Anaheim |
| 657-278 | Fullerton |
| 657-281 | Irvine |
| 657-282 | Orange |
| 657-283 | Santa Ana |
| 657-284 | Orange |
| 657-285 | Santa Ana |
| 657-286 | California |
| 657-291 | Orange |
| 657-292 | Santa Ana |
| 657-293 | Silverado |
| 657-294 | Santa Ana |
| 657-295 | Anaheim |
| 657-300 | Huntington Beach |
| 657-330 | Fullerton |
| 657-333 | Orange |
| 657-336 | Santa Ana |
| 657-363 | Yorba Linda |
| 657-378 | Fullerton |
| 657-383 | Santa Ana |
| 657-400 | Westminster |
| 657-444 | Placentia |
| 657-456 | Anaheim |
| 657-464 | Huntington Beach |
| 657-465 | Anaheim |
| 657-500 | Fullerton |
| 657-529 | Buena Park |
| 657-549 | Anaheim |
| 657-600 | Santa Ana |
| 657-622 | Santa Ana |
| 657-666 | Long Beach |
| 657-667 | Garden Grove |
| 657-699 | Santa Ana |
| 657-777 | Cypress |
| 657-800 | Garden Grove |
| 657-845 | Huntington Beach |
| 657-859 | Santa Ana |
| 657-888 | Orange |
| 657-900 | Santa Ana |
| 657-999 | Anaheim |