Borough · New Jersey
Mount Arlington, New Jersey
Mount Arlington, borough, in Morris County, New Jersey. Mount Arlington had 5,985 residents on July 1, 2025 by the Census Bureau's estimate, up 1.2% since 2020; the 2020 Census counted 5,909 and the ACS 2020-2024 5-year estimates put it at 5,935 (±18). GEOID 3448690.
Residents, July 2025 estimate
5,985
Census Bureau estimate (no margin published)
2020 Census count: 5,909 · ACS 2020-2024: 5,935 ±18
Median household income
$92,264
±$19,342 (90% margin)
New Jersey: $103,556
Median home value
$422,900
±$24,156 (90% margin)
New Jersey: $454,400
Median gross rent
$2,392
±$197 (90% margin)
New Jersey: $1,720
Where is Mount Arlington and what county is it in?
Mount Arlington is a borough in Morris County, New Jersey. It covers 2.1 square miles of land, 2,759 residents per square mile in 2020.
Mount Arlington is in the New York-Newark-Jersey City, NY-NJ metropolitan statistical area, which takes in 22 counties (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Mount Arlington, and is it growing?
The Census Bureau estimates that 5,985 people lived in Mount Arlington on July 1, 2025, up 1.2% since 2020, slower than New Jersey (+2.8%). The 2020 Census counted 5,909 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 5,935 (±18).
| Measure | Mount Arlington | Morris County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 5,935 ±18 | 514,528 | +298 |
| Households | 2,799 ±161 | 193,245 | +596 |
| Average household size | 2.12 ±0.12 | 2.62 | −0.44 |
| Housing units | 3,054 ±174 | 199,506 | +394 |
Mount Arlington's population since 2000
From 4,663 in 2000 to 5,985 in 2025: up 28.4%. The 2000, 2010 and 2020 figures are census counts, each for Mount Arlington as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Mount Arlington?
The median resident of Mount Arlington is 48.1 years old; 14.4% are under 18 and 25.1% are 65 or older. The largest group is non-Hispanic white residents at 74.7%, then Hispanic or Latino residents (of any race) at 14.4%. 15.1% of residents were born outside the United States.
| Measure | Mount Arlington | Morris County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 48.1 ±4.2 | 42.6 | no clear change |
| Under 18 years | 14.4% ±1.9 pts | 20.6% | – |
| 65 years and over | 25.1% ±3.0 pts | 18.2% | – |
| Male | 43.6% ±3.1 pts | 49.6% | – |
| Hispanic or Latino (any race) | 14.4% ±5.2 pts | 16.0% | no clear change |
| White alone, not Hispanic | 74.7% ±6.7 pts | 65.8% | no clear change |
| Black or African American alone, not Hispanic | 5.5% ±3.6 pts | 3.0% | – |
| Asian alone, not Hispanic | 3.6% ±3.0 pts | 10.7% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.8 pts | 0.0% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.8 pts | 0.0% | – |
| Two or more races, not Hispanic | 1.1% ±0.9 pts | 3.7% | – |
| Some other race alone, not Hispanic | 0.7% ±0.7 pts | 0.7% | – |
| Born outside the United States | 15.1% ±4.9 pts | 19.8% | no clear change |
| Speak a language other than English at home (age 5+) | 21.8% ±6.4 pts | 26.6% | – |
| Civilian veterans (age 18+) | 4.1% ±1.7 pts | 3.4% | – |
| With a disability | 15.4% ±3.7 pts | 9.0% | – |
| No health insurance coverage | 2.3% ±1.8 pts | 4.7% | – |
| High school graduate or higher (age 25+) | 98.6% ±1.0 pts | 94.9% | – |
| Bachelor's degree or higher (age 25+) | 50.9% ±6.4 pts | 57.8% | +13.5 pts |
| Graduate or professional degree (age 25+) | 17.4% ±4.4 pts | 24.1% | – |
| Lived in the same house a year earlier | 90.1% ±3.2 pts | 91.1% | – |
| Moved from another state in the past year | 2.1% ±1.7 pts | 1.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Mount Arlington earn?
Half of Mount Arlington's 2,799 households earn less than $92,264 a year (±$19,342), against $137,326 in Morris County and $103,556 in New Jersey. In 2015-2019 it was $94,816 in 2024 dollars; the margins of error cannot tell the two periods apart. 4.9% of residents live below the poverty line.
| Measure | Mount Arlington | Morris County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $92,264 ±$19,342 | $137,326 | no clear change |
| Mean household income | $113,261 ±$11,289 | $186,467 | – |
| Per capita income | $54,256 ±$5,712 | $71,044 | no clear change |
| People below the poverty line | 4.9% ±2.9 pts | 4.9% | – |
| Children under 18 below the poverty line | 4.8% ±7.8 pts | 5.2% | – |
| Households receiving SNAP | 0.9% ±1.0 pts | 3.7% | – |
| Households with a computer | 93.8% ±3.6 pts | 97.1% | – |
| Households with a broadband subscription | 94.0% ±3.6 pts | 95.2% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Mount Arlington?
Owners occupy 75.2% of Mount Arlington's occupied homes and renters 24.8%. The median owner-occupied home is valued at $422,900 by its owner (±$24,156). The median renter pays $2,392 a month including utilities, and 42.7% of renters pay 35% or more of their income on rent.
| Measure | Mount Arlington | Morris County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $422,900 ±$24,156 | $582,500 | +$47,415 |
| Median gross rent | $2,392 ±$197 | $1,904 | no clear change |
| Renters paying 35% or more of income on rent | 42.7% ±16.2 pts | 38.4% | no clear change |
| Median monthly owner costs, with a mortgage | $2,566 ±$192 | $3,295 | – |
| Owner-occupied homes | 75.2% ±5.1 pts | 74.3% | +9.7 pts |
| Renter-occupied homes | 24.8% ±5.1 pts | 25.7% | – |
| Housing units | 3,054 ±174 | 199,506 | +394 |
| Homeowner vacancy rate | 0.0% ±2.1 pts | 0.5% | – |
| Rental vacancy rate | 13.8% ±11.7 pts | 3.3% | – |
| Single-family detached homes | 47.3% ±5.5 pts | 65.1% | – |
| Mobile homes | 0.0% ±1.5 pts | 0.3% | – |
| Built 2020 or later | 0.0% ±1.5 pts | 0.9% | – |
| Built 2010 to 2019 | 11.4% ±3.3 pts | 5.2% | – |
| Built 1939 or earlier | 8.8% ±3.6 pts | 12.4% | – |
| Households with no vehicle | 2.9% ±2.7 pts | 5.1% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Mount Arlington building?
Builders took permits for 7 new housing units in Mount Arlington in 2025 (7 in single-family houses), 1.2 per 1,000 residents against 2.9 across New Jersey.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Mount Arlington work and get to work?
71.5% of Mount Arlington's workers drive alone and 21.1% work from home. The average trip to work takes 36.5 minutes.
| Measure | Mount Arlington | Morris County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 65.8% ±4.4 pts | 68.5% | – |
| Unemployment rate | 3.2% ±2.7 pts | 5.2% | – |
| Drove alone to work | 71.5% ±5.9 pts | 66.3% | – |
| Carpooled | 3.3% ±2.0 pts | 5.6% | – |
| Public transportation | 1.6% ±1.8 pts | 3.3% | – |
| Walked | 0.8% ±1.0 pts | 1.5% | – |
| Worked from home | 21.1% ±5.1 pts | 21.8% | – |
| Mean travel time to work | 36.5 min ±4.5 | 29.8 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Mount Arlington?
2 census tracts lie mostly in Mount Arlington (2020 census blocks). Their median household incomes run from $89,766 (Tract 454.03) to $94,917 (Tract 454.04).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 454.03Morris County | 3,501 | $89,766 |
| Tract 454.04Morris County | 2,434 | $94,917 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Mount Arlington) · Census block assignment files
How does Mount Arlington compare with other places in New Jersey?
By the Census Bureau's July 2025 estimates, Mount Arlington is the 4,424th-most populous of the 19,476 U.S. incorporated places that have one and the 179th-most populous of 323 in New Jersey.
Mount Arlington ranks 550th of 771 places in New Jersey with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 179th | 323 |
| Growth 2020-2025 (PEP) | 362nd | 532 |
| Residents per square mile | 321st | 787 |
| Median household income | 550th | 771 |
| Per capita income | 402nd | 785 |
| Median home value | 419th | 777 |
| Median gross rent | 92nd | 701 |
| Poverty rate | 358th | 539 |
| Bachelor's degree or higher | 309th | 780 |
| Median age | 159th | 786 |
| Owner-occupied share | 464th | 777 |
| Work from home | 239th | 695 |
| Travel time to work | 103rd | 787 |
Mount Arlington's figures with every place in New Jersey (CSV)
Every place in New Jersey, sortable · Compare Mount Arlington with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Mount Arlington?
17 of the 57 figures for Mount Arlington on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Mount Arlington are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' public schools in Mount Arlington.