ZIP code 21131

ZIP 21131 is a mid-size town in Baltimore County, Maryland, with 7,050 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #207 of 477 ranked by population — larger than 56% of them. The median age here is 48.5 years against 39.1 nationally, a markedly older profile that usually tracks retirees staying put and younger households leaving for work. Places under 65,000 residents only appear in the five-year release, never the one-year file, so these values pool sixty months of responses and lag the current year by design.

Households in ZIP 21131 earn a median of $187,250 a year, 138.4% above the national figure of $78,538. Household income here is measured before tax and pooled across everyone at the address, which is why it reads higher than typical individual earnings in the same area. Poverty reaches 3.4% of residents here, less than half the 12.4% national rate.

The typical owner-occupied home in ZIP 21131 is valued at $662,900, 118.5% above the national figure, while median gross rent runs not published a month. The home-price-to-income ratio works out to 3.5×, against roughly 3.9× nationally, so buying is easier here than in the average US market. 98.9% of occupied homes are owner-occupied versus 65% nationally, an owner-dominated market where rental listings are scarce and rent medians rest on a thin sample. Rent is reported gross — contract rent plus tenant-paid utilities — which is why it runs above the advertised price on a listing for the same unit.

The Census withheld gross rent for ZIP 21131 because the sample was too thin to publish at this geography. Those values were suppressed at the source, not lost in our dataset, and we do not model a replacement. Everything else on this page comes straight from the ACS 2019-2023 ACS 5-year tables.

ZIP 21131 is tabulated inside Baltimore County, Maryland, one of 44 ZIP areas the Census publishes for that county and 477 across Maryland. Population sits in the small-town band, typically one main street plus the addresses that feed into it. County assignment on this page follows the largest share of the ZIP's land area, which matters where a delivery route crosses a county line: mail addressed to 21131 can be handled by a post office in a neighbouring county even though the tabulation area is filed here.

Against its own county, 21131 reports a median household income of $187,250, 74% above the $107,714 county median, and 79% above the $104,338 typical MD ZIP. Owner-occupied homes are valued at a median of $662,900, 52% above the county figure and 65% above the statewide ZIP median. Rent is reported gross — the contract amount plus tenant-paid utilities — at not published a month, which is why it reads higher than the advertised rent on a listing for the same unit.

Maryland charges 6% statewide, and no local sales tax is layered on top, so the state rate is the full amount collected in 21131.

Everything above comes from the Census Bureau American Community Survey 2019-2023 ACS 5-year estimates for this ZIP Code Tabulation Area, with sales tax rates traced to the state revenue agency. Five-year estimates pool sixty months of responses, so they are stable enough to compare 21131 with its neighbours but always trail the current year, and any value the Census suppressed for sample size is shown as unpublished rather than filled in with a model.