Upper Marlboro, Maryland Demographics & Population 2026

A note before these figures: with a population of 683, Upper Marlboro's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.

Population Overview

Upper Marlboro is a small community located in Maryland, within Prince George's County. The total population is 683. It ranks as the 363rd most populous out of 527 Census-designated places in Maryland.

Age Demographics

The median age in Upper Marlboro is 34.9 years. This is 11% lower than the state median of 39.4 years.

Economy, Income & Housing

The median household income in Upper Marlboro is $116,875. This is 13% higher than the state median of $103,678. It is also 45% higher than the national median of $80,734. The poverty rate stands at 3.7%. This is 61% lower than the state poverty rate of 9.4%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 4.2%. This is 14% lower than the state rate of 4.9%. The median home value is $357,500. Housing costs are 15% lower than the state median of $419,900. The home-value-to-income ratio is 3.1x. 87.9% of occupied housing units are owner-occupied. This homeownership rate is 30% higher than the state average of 67.6%.

Race & Ethnicity

The largest racial or ethnic group in Upper Marlboro is Black or African American, making up 70.7% of the population. White (non-Hispanic) residents account for 21.1%. The White (non-Hispanic) population (21.1%) is well below the state average of 46.6%. The Black or African American population is significantly higher than the state average (70.7% vs 28.9%). The Hispanic or Latino population (3.4%) is well below the state average of 12.5%.

Education

52.8% of residents aged 25 and older hold a bachelor's degree or higher. This is 22% higher than the state rate of 43.5%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 99.4%. Notably, 20.7% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for Upper Marlboro, Maryland is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Maryland state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 527 Census-designated places in Maryland. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.