Mount Arlington, New Jersey Demographics & Population 2026

Population Overview

Mount Arlington is a small city located in New Jersey, within Morris County. The total population is 5,935. It ranks as the 264th most populous out of 700 Census-designated places in New Jersey.

Age Demographics

The median age in Mount Arlington is 48.1 years. This is 20% higher than the state median of 40.1 years. Only 14.4% of residents are under 18, indicating fewer families with children. 14.5% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The median household income in Mount Arlington is $92,264. This is 11% lower than the state median of $103,556. It is also 14% higher than the national median of $80,734. The poverty rate stands at 4.9%. This is 50% lower than the state poverty rate of 9.7%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 3.2%. This is 50% lower than the state rate of 6.3%. The median home value is $422,900. Housing costs are 7% lower than the state median of $454,400. The home-value-to-income ratio is 4.6x. 75.2% of occupied housing units are owner-occupied. This homeownership rate is 18% higher than the state average of 63.8%.

Race & Ethnicity

The largest racial or ethnic group in Mount Arlington is White (non-Hispanic), making up 74.7% of the population. Hispanic or Latino residents account for 14.4%. The Black or African American population (5.5%) is well below the state average of 12.2%. The Asian population (3.6%) is well below the state average of 10.1%.

Education

50.9% of residents aged 25 and older hold a bachelor's degree or higher. This is 17% higher than the state rate of 43.6%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 98.6%. Notably, 17.4% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for Mount Arlington, New Jersey 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 New Jersey state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 700 Census-designated places in New Jersey. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.