Reston, VA

ZIP code 20191 is assigned to Reston, VA, and falls within Fairfax 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 30,077 people live inside it.

At 3,878 residents per square mile spread over 7.756 square miles, 20191 reads as a densely built-up area. It is a populous postal code, 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 here sit well above the national picture. The median household income of $141,019 places 20191 in the upper reaches of American postal codes, ahead of 96% 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 20191 costs well above the national median. A typical home is valued at $616,700 against a US median of $207,500, and median gross rent runs $1,983 a month. The split between owning and renting is fairly even at 69.4% 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 63.7% of housing units here. The median construction year is 1978, making the housing here from the later twentieth century.

The population skews broadly in line with the national age profile, with a median age of 39.5 against 42 nationally. The average household holds 2.5 people, and 64.7% are family households.

Getting to work takes 29.5 minutes on average one way. The dominant mode is drove alone at 52.7% of workers, while 27.8% work from home. Commute patterns are one of the better proxies for how a place actually functions day to day.

Beyond addressing mail, 20191 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, 20191 offers a compact profile of Reston: 30,077 residents, a median household income of $141,019, 65.9% of adults holding a bachelor's degree or higher, and an unemployment rate of 5.1%. 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. 20191 may cover parts of several distinct areas, and a single neighbourhood in Reston 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.