Saint Louis, MO

ZIP code 63104 is assigned to Saint Louis, MO, and falls within St. Louis (city) 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 18,701 people live inside it.

At 5,559 residents per square mile spread over 3.364 square miles, 63104 reads as a densely built-up area. It is a mid-sized postal code by population, 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 $70,127 puts 63104 near the middle of the pack, ahead of 50% 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 63104 costs close to the national median. A typical home is valued at $249,500 against a US median of $207,500, and median gross rent runs $1,054 a month. The split between owning and renting is fairly even at 48.2% owner-occupied, which tends to indicate a mix of housing types rather than one dominant form.

The building stock is dominated by detached single-family houses, which account for 39.8% of housing units here. The median construction year is 1938, making the housing here largely pre-war.

The population skews broadly in line with the national age profile, with a median age of 37.6 against 42 nationally. Households average just 1.9 people, and 49.2% consist of one person living alone — a signature of areas with a lot of studio and one-bedroom stock.

Getting to work takes 22.3 minutes on average one way. The dominant mode is drove alone at 71.0% of workers, while 17.9% work from home. Commute patterns are one of the better proxies for how a place actually functions day to day.

Beyond addressing mail, 63104 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, 63104 offers a compact profile of Saint Louis: 18,701 residents, a median household income of $70,127, 54.0% of adults holding a bachelor's degree or higher, and an unemployment rate of 2.6%. 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. 63104 may cover parts of several distinct areas, and a single neighbourhood in Saint Louis 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.