San Pedro, CA

ZIP code 90731 is assigned to San Pedro, CA, and falls within Los Angeles County. Like every US postal code, it began as a mail-routing device rather than a geographic boundary — the US Postal Service groups delivery routes under a single code so carriers and sorting equipment can process mail efficiently. Today it also serves as a practical shorthand for the area itself: roughly 62,452 people live inside it.

At 6,770 residents per square mile spread over 9.225 square miles, 90731 reads as a densely built-up area. It is one of the more heavily populated postal codes in the country, and density shapes almost everything else on this page — how people get to work, whether they own or rent, and what housing costs.

Household earnings track close to the national picture. The median of $71,936 puts 90731 near the middle of the pack, ahead of 53% of them. The US median for comparison is $70,109. Bear in mind that median income describes the midpoint household, not the average — it is not pulled upward by a handful of very high earners the way a mean would be.

Housing in 90731 costs far above the national median. A typical home is valued at $808,800 against a US median of $207,500, and median gross rent runs $1,645 a month. This is firmly renter territory — 67.3% of occupied homes are rented, a pattern typical of city centres, student areas and neighbourhoods with a lot of apartment stock.

The building stock is dominated by detached single-family houses, which account for 43.3% of housing units here. The median construction year is 1963, making the housing here mid-century.

The population skews broadly in line with the national age profile, with a median age of 38.8 against 42 nationally. The average household holds 2.7 people, and 62.5% are family households.

Getting to work takes 32.5 minutes on average one way. The dominant mode is drove alone at 72.9% of workers, while 10.5% work from home. Commute patterns are one of the better proxies for how a place actually functions day to day.

Beyond addressing mail, 90731 does a lot of quiet administrative work. Retailers use it to calculate shipping and sales tax at checkout. Insurers use it to set premiums, since risk profiles vary geographically. Employers and marketers use it to define service areas. Government agencies use it to route benefits and organise reporting. If you have ever been asked for a postal code by a form that clearly does not intend to send you anything, this is why.

For anyone weighing a move, 90731 offers a compact profile of San Pedro: 62,452 residents, a median household income of $71,936, 25.4% of adults holding a bachelor's degree or higher, and an unemployment rate of 6.9%. A handful of figures like these answer more relocation questions than most neighbourhood guides do.

One caution worth repeating: a postal code is not a neighbourhood. 90731 may cover parts of several distinct areas, and a single neighbourhood in San Pedro may be split across more than one code. Boundaries also shift as USPS adjusts delivery routes. Treat the figures here as describing a delivery area, which is what they actually measure.