California Address Generator

California has the widest postal geography in the country: 2,593 postal codes spread across 60 three-digit prefixes, against a national average nearer 18. Any validation built on prefix ranges needs care here simply because there are so many of them, and any fixture set that samples "a few California ZIPs" is sampling a fraction of a percent of the state.

The more expensive detail is what the city field means. Los Angeles County holds 508 postal codes filed under 133 distinct USPS place names, and only 94 of them are filed as "Los Angeles". Van Nuys, Pasadena, Long Beach, Burbank and Glendale are separate place names — some of them separate cities, some of them neighbourhoods inside the City of Los Angeles that the Postal Service files under their own name anyway.

So in California the city line is a postal place name, not a municipality, and the two disagree constantly. A resident of Van Nuys who writes "Los Angeles" has not made a mistake, and neither has one who writes "Van Nuys"; a validator that insists on one of them will reject a large share of correct addresses in the largest county in the United States. Accept what the customer types, store it, and standardise only at the point where you hand the address to a carrier.

The county picture is ordinary by comparison — 58 counties, a number that has not changed since 1907 — which makes California a useful counterweight in a fixture set: enormous postal variety, unremarkable administrative structure.

One California county earns its own fixture. Truckee, postal code 96162, sits in Nevada County, California — and there is a Nevada City in it, which is the county seat. Any code that resolves a place or county name to a state will read "Nevada" as the state next door and put the address 200 miles away, in a different tax jurisdiction and a different carrier zone, without raising anything. It is the same class of bug as Virginia's city-and-county pairs, arriving from a different direction: there, two jurisdictions share a name; here, a county shares its name with a state.

Random California phone numbers here use the state's real area codes — 213, 310, 415, 619 and 916 — with the 555-01XX line range the North American Numbering Plan reserves for fiction, so a number such as (213) 555-0113 passes format and area-code checks yet can never ring anyone. Every profile this page generates carries one that agrees with its California address; for a batch of numbers on their own, the random California phone number generator draws from the same range with any US area code.

Three examples in the reserved range: (213) 555-0113, (310) 555-0187, (415) 555-0105. Area codes are geographic, so a California address paired with a non-CA area code fails the consistency check that fraud systems and good validators run — which is why this page pins both to California. How area codes are assigned, and why the 555 block exists, are covered in how US area codes work and why fake phone numbers start with 555.