Census tract · Mercer County
Census Tract 331, Mercer County, Pennsylvania
Census Tract 331, GEOID 42085033100, in Mercer County, Pennsylvania, partly within Springfield Township, Mercer County, Wilmington Township, Mercer County and Liberty Township, Mercer County. 4,971 residents in the ACS 2020-2024 5-year estimates (±300); the 2020 Census counted 4,678.
Residents, 2020-2024
4,971
±300 (90% margin)
2020 Census count: 4,678
Median household income
$79,435
±$6,291 (90% margin)
Mercer County: $59,976
Median home value
$244,700
±$13,565 (90% margin)
Mercer County: $164,000
Median gross rent
$990
±$123 (90% margin)
Mercer County: $843
Where is Census Tract 331?
Census Tract 331 is one of 35 census tracts in Mercer County, Pennsylvania. It covers 55.15 square miles of land, 85 residents per square mile in 2020. Its GEOID, 42085033100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Springfield Township, Mercer County | 46% |
| Wilmington Township, Mercer County | 31% |
| Liberty Township, Mercer County | 23% |
13 census tracts border Census Tract 331: Tract 9103.01 in Butler County ($63,355), Tract 9103.02 in Butler County ($58,958), Tract 101 in Lawrence County ($81,696), Tract 102.02 in Lawrence County ($74,003), Tract 103 in Lawrence County ($73,696), Tract 104 in Lawrence County ($74,583), Tract 326.01 ($79,244), Tract 326.02 ($59,306), Tract 327.01 ($74,714), Tract 327.02 ($57,500), Tract 328.01 ($85,592), Tract 328.02 ($95,156) and Tract 330 ($56,067). 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 331?
The 2020-2024 American Community Survey puts Census Tract 331's population at 4,971 (±300) in 1,880 households; the 2020 Census counted 4,678 residents and 1,935 housing units.
| Measure | Tract 331 | Mercer County |
|---|---|---|
| Total population | 4,971 ±300 | 109,257 |
| Households | 1,880 ±106 | 46,524 |
| Average household size | 2.64 ±0.14 | 2.21 |
| Housing units | 1,961 ±95 | 50,930 |
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 331?
The median resident of Census Tract 331 is 41.0 years old; 25.2% are under 18 and 20.5% are 65 or older. The largest group is non-Hispanic white residents at 95.0%, then non-Hispanic residents of two or more races at 2.7%. 0.9% of residents were born outside the United States.
| Measure | Tract 331 | Mercer County |
|---|---|---|
| Median age | 41.0 ±2.5 | 45.1 |
| Under 18 years | 25.2% ±2.7 pts | 18.9% |
| 65 years and over | 20.5% ±2.2 pts | 23.1% |
| Hispanic or Latino (any race) | 0.5% ±0.5 pts | 1.7% |
| White alone, not Hispanic | 95.0% ±2.0 pts | 87.9% |
| Black or African American alone, not Hispanic | 0.5% ±0.6 pts | 5.6% |
| Asian alone, not Hispanic | 0.5% ±0.4 pts | 0.6% |
| American Indian and Alaska Native alone, not Hispanic | 0.1% ±0.1 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 | 2.7% ±1.6 pts | 3.7% |
| Some other race alone, not Hispanic | 0.7% ±0.9 pts | 0.4% |
| Born outside the United States | 0.9% ±0.4 pts | 1.8% |
| Speak a language other than English at home (age 5+) | 13.4% ±4.1 pts | 4.1% |
| Civilian veterans (age 18+) | 8.1% ±1.6 pts | 8.6% |
| With a disability | 11.5% ±1.9 pts | 17.3% |
| No health insurance coverage | 16.3% ±3.8 pts | 6.4% |
| High school graduate or higher (age 25+) | 88.4% ±2.7 pts | 91.7% |
| Bachelor's degree or higher (age 25+) | 30.3% ±3.6 pts | 25.6% |
| Graduate or professional degree (age 25+) | 12.2% ±2.3 pts | 8.6% |
| Lived in the same house a year earlier | 95.4% ±1.6 pts | 91.0% |
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 331 earn?
Half of the 1,880 households in Census Tract 331 earn less than $79,435 a year (±$6,291), against $59,976 across Mercer County: 5th highest of the county's 35 tracts with a reliable estimate. 8.7% of residents live below the poverty line.
| Measure | Tract 331 | Mercer County |
|---|---|---|
| Median household income | $79,435 ±$6,291 | $59,976 |
| Mean household income | $97,499 ±$6,618 | $79,381 |
| Per capita income | $37,263 ±$2,741 | $34,033 |
| People below the poverty line | 8.7% ±3.0 pts | 13.2% |
| Children under 18 below the poverty line | 13.6% ±6.7 pts | 20.6% |
| Households receiving SNAP | 8.5% ±2.3 pts | 17.4% |
| Households with a computer | 82.8% ±3.6 pts | 90.5% |
| Households with a broadband subscription | 79.0% ±3.7 pts | 85.7% |
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 331?
Owners occupy 82.4% of Census Tract 331's occupied homes and renters 17.6%. The median owner-occupied home is valued at $244,700 by its owner (±$13,565). The median renter pays $990 a month including utilities, and 30.0% of renters pay 35% or more of their income on rent.
| Measure | Tract 331 | Mercer County |
|---|---|---|
| Median home value (owner-occupied) | $244,700 ±$13,565 | $164,000 |
| Median gross rent | $990 ±$123 | $843 |
| Renters paying 35% or more of income on rent | 30.0% ±12.3 pts | 37.2% |
| Median monthly owner costs, with a mortgage | $1,497 ±$96 | $1,266 |
| Owner-occupied homes | 82.4% ±3.5 pts | 72.4% |
| Renter-occupied homes | 17.6% ±3.5 pts | 27.6% |
| Housing units | 1,961 ±95 | 50,930 |
| Single-family detached homes | 79.4% ±3.6 pts | 75.0% |
| Mobile homes | 10.5% ±3.3 pts | 7.0% |
| Built 2020 or later | 1.6% ±0.8 pts | 0.6% |
| Built 2010 to 2019 | 7.8% ±2.6 pts | 2.6% |
| Built 1939 or earlier | 15.1% ±3.4 pts | 22.1% |
| Households with no vehicle | 11.2% ±2.5 pts | 9.6% |
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 do people in Census Tract 331 get to work?
72.8% of Census Tract 331's workers drive alone and 13.7% work from home. The average trip to work takes 26.1 minutes. The unemployment rate in 2020-2024 averaged 2.8%.
| Measure | Tract 331 | Mercer County |
|---|---|---|
| In the labor force (age 16+) | 58.4% ±3.2 pts | 54.6% |
| Unemployment rate | 2.8% ±1.1 pts | 5.3% |
| Drove alone to work | 72.8% ±3.8 pts | 79.6% |
| Carpooled | 7.2% ±2.4 pts | 6.4% |
| Public transportation | 0.0% ±1.5 pts | 0.2% |
| Walked | 4.2% ±1.8 pts | 2.9% |
| Worked from home | 13.7% ±2.6 pts | 9.3% |
| Mean travel time to work | 26.1 min ±2.3 | 21.7 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 331 compare with the other tracts in Mercer County?
Among Mercer County's tracts with a reliable estimate, Census Tract 331 ranks as shown below (1 = highest).
| Measure | In Mercer County |
|---|---|
| Population | 5th of 35 |
| Residents per square mile | 29th of 35 |
| Median household income | 5th of 35 |
| Per capita income | 13th of 35 |
| Median home value | 4th of 34 |
| Median gross rent | 9th of 33 |
| Poverty rate | 31st of 32 |
| Bachelor's degree or higher | 10th of 33 |
| Median age | 25th of 35 |
| Owner-occupied share | 12th of 35 |
The tracts next to it on Mercer County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 328.01 | 2nd | $85,592±$22,384 · within the margin of this tract |
| Tract 313 | 3rd | $85,188±$32,112 · within the margin of this tract |
| Tract 312 | 4th | $83,244±$14,777 · within the margin of this tract |
| Tract 331 | 5th | $79,435±$6,291 |
| Tract 326.01 | 6th | $79,244±$7,938 · within the margin of this tract |
| Tract 317 | 7th | $75,848±$25,366 · within the margin of this tract |
| Tract 323 | 8th | $75,476±$9,546 · within the margin of this tract |
"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 331?
3 of the 18 figures for Census Tract 331 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