ZIP Code 91921 — Chula Vista, California
📍 ZIP code 91921 is in Chula Vista, San Diego County, California.
ZIP code 91921 is a PO Box ZIP code assigned by the U.S. Postal Service in Chula Vista, San Diego County, California. It serves post office boxes at a Chula Vista post office rather than street addresses, which is why the Census Bureau reports no resident population, income or housing figures for it. Mail addressed to 91921 is handled in the Pacific Time Zone and the local area code is 619. The demographic profile of the surrounding community is on the standard delivery ZIP pages for Chula Vista listed below.
Why there are no demographics for 91921
The Census Bureau publishes demographics for ZIP Code Tabulation Areas (ZCTAs), which are built from populated census blocks. A PO Box ZIP like 91921 has no delivery territory of its own, so there is no ZCTA and no population, income, housing or education estimate to report. This is normal: San Diego County and the rest of California have hundreds of PO Box and unique ZIPs of this kind.
For the community around Chula Vista, use the delivery ZIPs that do carry Census data:
How ZIPs and ZCTAs differ is explained on the methodology page.
Nearby Zip Codes
Cities & Places Served
ZIP code 91921 primarily serves Chula Vista in San Diego County, California.