Census tract · Sussex County
Census Tract 3731, Sussex County, New Jersey
Census Tract 3731, GEOID 34037373100, in Sussex County, New Jersey, entirely within Sparta Township. 6,386 residents in the ACS 2020-2024 5-year estimates (±553); the 2020 Census counted 6,331.
Residents, 2020-2024
6,386
±553 (90% margin)
2020 Census count: 6,331
Median household income
$200,040
±$23,845 (90% margin)
Sussex County: $116,186
Median home value
$587,200
±$41,690 (90% margin)
Sussex County: $369,400
Median gross rent
$1,682
±$189 (90% margin)
Sussex County: $1,585
Where is Census Tract 3731?
Census Tract 3731 is one of 42 census tracts in Sussex County, New Jersey. It covers 17.47 square miles of land, 362 residents per square mile in 2020. Its GEOID, 34037373100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Sparta Township | 100% |
| Lake Mohawk | 14% |
8 census tracts border Census Tract 3731: Tract 3724 ($129,038), Tract 3725 ($108,194), Tract 3729 ($88,864), Tract 3730 ($105,551), Tract 3732 ($211,065), Tract 3733 ($150,132), Tract 3734 ($131,289) and Tract 3735 ($143,500). The figure in brackets is each tract's median household income.
Whether a tract counts as low- or moderate-income for bank lending (the Community Reinvestment Act) is set by the FFIEC against its metro area's family income: look it up in the FFIEC census geocoder.
Source: 2024 Gazetteer and 2020 block assignment files, U.S. Census Bureau · Census reference files
How many people live in Census Tract 3731?
The 2020-2024 American Community Survey puts Census Tract 3731's population at 6,386 (±553) in 2,171 households; the 2020 Census counted 6,331 residents and 2,194 housing units.
| Measure | Tract 3731 | Sparta Township |
|---|---|---|
| Total population | 6,386 ±553 | 20,077 |
| Households | 2,171 ±185 | 7,452 |
| Average household size | 2.93 ±0.21 | 2.68 |
| Housing units | 2,250 ±155 | 7,837 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Census Tract 3731?
The median resident of Census Tract 3731 is 42.1 years old; 28.6% are under 18 and 13.4% are 65 or older. The largest group is non-Hispanic white residents at 80.4%, then Hispanic or Latino residents (of any race) at 8.3%. 14.2% of residents were born outside the United States.
| Measure | Tract 3731 | Sparta Township |
|---|---|---|
| Median age | 42.1 ±1.6 | 41.2 |
| Under 18 years | 28.6% ±3.8 pts | 24.7% |
| 65 years and over | 13.4% ±2.3 pts | 13.5% |
| Hispanic or Latino (any race) | 8.3% ±2.5 pts | 8.8% |
| White alone, not Hispanic | 80.4% ±4.3 pts | 81.4% |
| Black or African American alone, not Hispanic | 0.1% ±0.1 pts | 0.8% |
| Asian alone, not Hispanic | 8.2% ±3.0 pts | 4.2% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.7 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.7 pts | 0.0% |
| Two or more races, not Hispanic | 1.9% ±1.7 pts | 3.9% |
| Some other race alone, not Hispanic | 1.0% ±1.4 pts | 0.8% |
| Born outside the United States | 14.2% ±4.1 pts | 10.3% |
| Speak a language other than English at home (age 5+) | 17.7% ±5.0 pts | 12.7% |
| Civilian veterans (age 18+) | 1.2% ±0.8 pts | 4.0% |
| With a disability | 9.3% ±3.0 pts | 8.8% |
| No health insurance coverage | 4.8% ±6.0 pts | 3.0% |
| High school graduate or higher (age 25+) | 99.1% ±0.7 pts | 98.1% |
| Bachelor's degree or higher (age 25+) | 63.3% ±6.3 pts | 63.1% |
| Graduate or professional degree (age 25+) | 21.8% ±5.8 pts | 26.2% |
| Lived in the same house a year earlier | 94.3% ±3.9 pts | 93.5% |
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 Census Tract 3731 earn?
Half of the 2,171 households in Census Tract 3731 earn less than $200,040 a year (±$23,845), against $116,186 across Sussex County: 2nd highest of the county's 42 tracts with a reliable estimate.
| Measure | Tract 3731 | Sparta Township |
|---|---|---|
| Median household income | $200,040 ±$23,845 | $167,963 |
| Mean household income | $244,434 ±$33,015 | $203,363 |
| Per capita income | $84,875 ±$12,261 | $75,855 |
| People below the poverty line | 7.6% ±6.6 pts | 4.0% |
| Children under 18 below the poverty line | 15.7% ±15.6 pts | 6.4% |
| Households receiving SNAP | 0.0% ±2.0 pts | 1.6% |
| Households with a computer | 94.9% ±5.4 pts | 97.9% |
| Households with a broadband subscription | 94.9% ±5.7 pts | 96.2% |
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 Census Tract 3731?
Owners occupy 90.8% of Census Tract 3731's occupied homes and renters 9.2%. The median owner-occupied home is valued at $587,200 by its owner (±$41,690). The median renter pays $1,682 a month including utilities, and 92.2% of renters pay 35% or more of their income on rent.
| Measure | Tract 3731 | Sparta Township |
|---|---|---|
| Median home value (owner-occupied) | $587,200 ±$41,690 | $484,200 |
| Median gross rent | $1,682 ±$189 | $1,864 |
| Renters paying 35% or more of income on rent | 92.2% ±12.5 pts | 61.1% |
| Median monthly owner costs, with a mortgage | $4,000 or more | $3,391 |
| Owner-occupied homes | 90.8% ±6.4 pts | 87.4% |
| Renter-occupied homes | 9.2% ±6.4 pts | 12.6% |
| Housing units | 2,250 ±155 | 7,837 |
| Single-family detached homes | 84.4% ±6.6 pts | 84.3% |
| Mobile homes | 1.4% ±2.1 pts | 0.4% |
| Built 2020 or later | 2.2% ±2.2 pts | 0.6% |
| Built 2010 to 2019 | 5.8% ±5.5 pts | 3.7% |
| Built 1939 or earlier | 10.0% ±5.7 pts | 15.2% |
| Households with no vehicle | 6.2% ±5.3 pts | 5.0% |
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 do people in Census Tract 3731 get to work?
66.5% of Census Tract 3731's workers drive alone and 28.4% work from home. The average trip to work takes 42.1 minutes. The unemployment rate in 2020-2024 averaged 6.5%.
| Measure | Tract 3731 | Sparta Township |
|---|---|---|
| In the labor force (age 16+) | 69.0% ±4.0 pts | 70.6% |
| Unemployment rate | 6.5% ±3.9 pts | 5.4% |
| Drove alone to work | 66.5% ±8.4 pts | 70.3% |
| Carpooled | 3.6% ±2.8 pts | 4.7% |
| Public transportation | 0.0% ±1.5 pts | 1.0% |
| Walked | 1.5% ±2.1 pts | 1.9% |
| Worked from home | 28.4% ±8.9 pts | 21.6% |
| Mean travel time to work | 42.1 min ±6.2 | 37.5 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
How does Census Tract 3731 compare with the other tracts in Sussex County?
Among Sussex County's tracts with a reliable estimate, Census Tract 3731 ranks as shown below (1 = highest).
| Measure | In Sussex County |
|---|---|
| Population | 2nd of 42 |
| Residents per square mile | 18th of 42 |
| Median household income | 2nd of 42 |
| Per capita income | 2nd of 42 |
| Median home value | 1st of 42 |
| Median gross rent | 16th of 38 |
| Bachelor's degree or higher | 1st of 42 |
| Median age | 25th of 42 |
| Owner-occupied share | 15th of 42 |
The tracts next to it on Sussex County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 3732 | 1st | $211,065±$40,128 · within the margin of this tract |
| Tract 3731 | 2nd | $200,040±$23,845 |
| Tract 3744 | 3rd | $188,824±$33,626 · within the margin of this tract |
| Tract 3733 | 4th | $150,132±$49,314 · within the margin of this tract |
| Tract 3735 | 5th | $143,500±$19,975 |
"Within the margin": the two incomes differ by less than their combined 90% margins, so the survey cannot say which is higher and the ranks between them are not firm.
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · How ranks are computed
How reliable are the figures for Census Tract 3731?
2 of the 18 figures for Census Tract 3731 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.
A census tract's figures rest on a few hundred sampled households over five years, so its margins are wider than a city's. Two tracts differ only when the gap between them is larger than their combined 90% margin (the square root of the sum of the two squared margins). 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 · Check it at data.census.gov
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections