Township · New Jersey
Frelinghuysen Township, New Jersey
Frelinghuysen Township, township, in Warren County, New Jersey. Frelinghuysen Township had 2,239 residents on July 1, 2025 by the Census Bureau's estimate, up 2.2% since 2020; the 2020 Census counted 2,199 and the ACS 2020-2024 5-year estimates put it at 2,137 (±260). GEOID 3404125320.
Residents, July 2025 estimate
2,239
Census Bureau estimate (no margin published)
2020 Census count: 2,199 · ACS 2020-2024: 2,137 ±260
Median household income
$122,727
±$5,830 (90% margin)
New Jersey: $103,556
Median home value
$455,500
±$32,343 (90% margin)
New Jersey: $454,400
Median gross rent
$1,683
±$237 (90% margin)
New Jersey: $1,720
Where is Frelinghuysen Township and what county is it in?
Frelinghuysen Township is a township in Warren County, New Jersey. It covers 23.6 square miles of land, 93 residents per square mile in 2020.
2 places lie inside Frelinghuysen Township: Johnsonburg (CDP, 381 in 2020) and Marksboro (CDP, 186 in 2020).
Frelinghuysen Township is in the Allentown-Bethlehem-Easton, PA-NJ metropolitan statistical area, which takes in 4 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 Frelinghuysen Township, and is it growing?
The Census Bureau estimates that 2,239 people lived in Frelinghuysen Township on July 1, 2025, up 2.2% since 2020, slower than New Jersey (+2.8%). The 2020 Census counted 2,199 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 2,137 (±260).
| Measure | Frelinghuysen Township | Warren County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 2,137±260 | 110,849 | no clear change |
| Households | 836±89 | 45,391 | no clear change |
| Average household size | 2.41±0.19 | 2.40 | −0.45 |
| Housing units | 877±89 | 46,789 | no clear change |
Frelinghuysen Township's population since 2000
From 2,083 in 2000 to 2,239 in 2025: up 7.5%. The 2000, 2010 and 2020 figures are census counts, each for Frelinghuysen Township 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 Frelinghuysen Township?
The median resident of Frelinghuysen Township is 51.5 years old; 16.0% are under 18 and 25.8% are 65 or older. The largest group is non-Hispanic white residents at 88.1%, then Hispanic or Latino residents (of any race) at 6.5%. 4.2% of residents were born outside the United States.
| Measure | Frelinghuysen Township | Warren County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 51.5±3.1 | 44.0 | +5.8 |
| Under 18 years | 16.0%±3.5 pts | 19.3% | – |
| 65 years and over | 25.8%±3.9 pts | 19.6% | – |
| Male | 50.8%±2.9 pts | 49.9% | – |
| Hispanic or Latino (any race) | 6.5%±2.8 pts | 13.0% | no clear change |
| White alone, not Hispanic | 88.1%±3.6 pts | 74.6% | no clear change |
| Black or African American alone, not Hispanic | 1.8%±2.0 pts | 5.6% | – |
| Asian alone, not Hispanic | 0.8%±0.9 pts | 3.0% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±2.1 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±2.1 pts | 0.0% | – |
| Two or more races, not Hispanic | 2.8%±1.8 pts | 3.5% | – |
| Some other race alone, not Hispanic | 0.0%±2.1 pts | 0.2% | – |
| Born outside the United States | 4.2%±2.0 pts | 10.6% | +2.3 pts |
| Speak a language other than English at home (age 5+) | 7.2%±2.9 pts | 15.4% | – |
| Civilian veterans (age 18+) | 3.9%±1.8 pts | 5.4% | – |
| With a disability | 13.9%±3.9 pts | 11.5% | – |
| No health insurance coverage | 0.8%±0.5 pts | 4.8% | −3.2 pts |
| High school graduate or higher (age 25+) | 96.7%±1.9 pts | 94.1% | – |
| Bachelor's degree or higher (age 25+) | 51.8%±7.2 pts | 36.5% | +13.6 pts |
| Graduate or professional degree (age 25+) | 15.8%±4.0 pts | 12.0% | – |
| Lived in the same house a year earlier | 95.0%±2.7 pts | 91.9% | – |
| Moved from another state in the past year | 1.6%±1.3 pts | 1.3% | – |
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 Frelinghuysen Township earn?
Half of Frelinghuysen Township's 836 households earn less than $122,727 a year (±$5,830), against $100,869 in Warren County and $103,556 in New Jersey. In 2015-2019 the median was $152,958 in 2024 dollars, so it fell by $30,231 after inflation. 3.8% of residents live below the poverty line.
| Measure | Frelinghuysen Township | Warren County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $122,727±$5,830 | $100,869 | −$30,231 |
| Mean household income | $149,718±$16,592 | $118,920 | – |
| Per capita income | $59,305±$7,178 | $48,600 | no clear change |
| People below the poverty line | 3.8%±2.0 pts | 8.3% | – |
| Children under 18 below the poverty line | 0.0%±12.9 pts | 10.4% | – |
| Households receiving SNAP | 3.1%±2.2 pts | 7.4% | – |
| Households with a computer | 97.0%±2.5 pts | 96.0% | – |
| Households with a broadband subscription | 93.2%±3.9 pts | 92.5% | – |
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 Frelinghuysen Township?
Owners occupy 93.4% of Frelinghuysen Township's occupied homes and renters 6.6%. The median owner-occupied home is valued at $455,500 by its owner (±$32,343). The median renter pays $1,683 a month including utilities.
| Measure | Frelinghuysen Township | Warren County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $455,500±$32,343 | $346,500 | no clear change |
| Median gross rent | $1,683±$237 | $1,409 | no clear change |
| Renters paying 35% or more of income on rent | 24.0%±27.0 pts | 40.3% | – |
| Median monthly owner costs, with a mortgage | $2,648±$415 | $2,317 | – |
| Owner-occupied homes | 93.4%±2.8 pts | 75.1% | no clear change |
| Renter-occupied homes | 6.6%±2.8 pts | 24.9% | – |
| Housing units | 877±89 | 46,789 | no clear change |
| Homeowner vacancy rate | 0.0%±5.6 pts | 0.6% | – |
| Rental vacancy rate | 0.0%±47.1 pts | 0.8% | – |
| Single-family detached homes | 98.5%±1.2 pts | 68.1% | – |
| Mobile homes | 0.5%±0.7 pts | 0.9% | – |
| Built 2020 or later | 0.0%±5.0 pts | 0.6% | – |
| Built 2010 to 2019 | 3.1%±2.0 pts | 3.2% | – |
| Built 1939 or earlier | 19.2%±5.1 pts | 23.6% | – |
| Households with no vehicle | 2.3%±1.7 pts | 5.6% | – |
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 Frelinghuysen Township building?
Builders took permits for 4 new housing units in Frelinghuysen Township in 2025 (4 in single-family houses), 1.8 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 Frelinghuysen Township work and get to work?
78.8% of Frelinghuysen Township's workers drive alone and 15.3% work from home. The average trip to work takes 33.2 minutes.
| Measure | Frelinghuysen Township | Warren County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 58.5%±5.1 pts | 67.1% | – |
| Unemployment rate | 6.8%±4.5 pts | 5.1% | – |
| Drove alone to work | 78.8%±6.4 pts | 76.5% | – |
| Carpooled | 2.5%±1.8 pts | 5.9% | – |
| Public transportation | 0.3%±0.5 pts | 1.8% | – |
| Walked | 1.9%±1.7 pts | 1.8% | – |
| Worked from home | 15.3%±6.1 pts | 12.5% | no clear change |
| Mean travel time to work | 33.2 min±3.6 | 34.0 min | −7.4 min |
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 Frelinghuysen Township?
1 census tract lies mostly in Frelinghuysen Township (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 311.02Warren County | 3,556 | $122,986 |
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 Frelinghuysen Township) · Census block assignment files
How does Frelinghuysen Township compare with other places in New Jersey?
By the Census Bureau's July 2025 estimates, Frelinghuysen Township is the 4,454th-most populous of the 16,079 U.S. towns and townships that have one and the 224th-most populous of 241 in New Jersey.
Frelinghuysen Township ranks 308th 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 | 224th | 241 |
| Growth 2020-2025 (PEP) | 231st | 532 |
| Residents per square mile | 773rd | 787 |
| Median household income | 308th | 771 |
| Per capita income | 315th | 785 |
| Median home value | 357th | 777 |
| Median gross rent | 439th | 701 |
| Poverty rate | 424th | 539 |
| Bachelor's degree or higher | 299th | 780 |
| Median age | 86th | 786 |
| Owner-occupied share | 94th | 777 |
| Work from home | 408th | 695 |
| Travel time to work | 219th | 787 |
Frelinghuysen Township's figures with every place in New Jersey (CSV)
Every place in New Jersey, sortable · Compare Frelinghuysen Township 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 Frelinghuysen Township?
18 of the 57 figures for Frelinghuysen Township 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 Frelinghuysen Township 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' school search.