Census tract · New Castle County
Census Tract 121, New Castle County, Delaware
Census Tract 121, GEOID 10003012100, in New Castle County, Delaware, outside any city, town or census-designated place. 3,454 residents in the ACS 2020-2024 5-year estimates (±593); the 2020 Census counted 2,901.
Residents, 2020-2024
3,454
±593 (90% margin)
2020 Census count: 2,901
Median household income
$91,202
±$22,383 (90% margin)
New Castle County: $91,166
Median home value
$337,200
±$27,420 (90% margin)
New Castle County: $352,200
Median gross rent
$1,700
±$248 (90% margin)
New Castle County: $1,448
Where is Census Tract 121?
Census Tract 121 is one of 145 census tracts in New Castle County, Delaware. It covers 1.13 square miles of land, 2,567 residents per square mile in 2020. Its GEOID, 10003012100, names it uniquely (how tract numbers and GEOIDs work).
4 census tracts border Census Tract 121: Tract 119 ($175,928), Tract 120 ($75,485), Tract 122 ($61,571) and Tract 124 ($77,746). 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 121?
The 2020-2024 American Community Survey puts Census Tract 121's population at 3,454 (±593) in 1,258 households; the 2020 Census counted 2,901 residents and 1,305 housing units.
| Measure | Tract 121 | New Castle County |
|---|---|---|
| Total population | 3,454 ±593 | 577,961 |
| Households | 1,258 ±214 | 224,173 |
| Average household size | 2.69 ±0.36 | 2.51 |
| Housing units | 1,354 ±175 | 236,079 |
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 121?
The median resident of Census Tract 121 is 35.9 years old; 20.7% are under 18 and 13.3% are 65 or older. The largest group is non-Hispanic white residents at 62.2%, then non-Hispanic Black residents at 18.2%. 8.3% of residents were born outside the United States.
| Measure | Tract 121 | New Castle County |
|---|---|---|
| Median age | 35.9 ±5.5 | 39.3 |
| Under 18 years | 20.7% ±3.1 pts | 21.2% |
| 65 years and over | 13.3% ±3.4 pts | 17.1% |
| Hispanic or Latino (any race) | 16.8% ±4.9 pts | 11.8% |
| White alone, not Hispanic | 62.2% ±9.5 pts | 52.3% |
| Black or African American alone, not Hispanic | 18.2% ±9.2 pts | 24.9% |
| Asian alone, not Hispanic | 2.2% ±2.1 pts | 6.2% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±1.1 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.1% ±0.1 pts | 0.0% |
| Two or more races, not Hispanic | 0.6% ±0.4 pts | 4.2% |
| Some other race alone, not Hispanic | 0.0% ±1.1 pts | 0.5% |
| Born outside the United States | 8.3% ±3.7 pts | 12.8% |
| Speak a language other than English at home (age 5+) | 16.2% ±7.4 pts | 17.3% |
| Civilian veterans (age 18+) | 6.0% ±2.5 pts | 5.8% |
| With a disability | 6.4% ±2.4 pts | 12.9% |
| No health insurance coverage | 2.7% ±1.8 pts | 5.9% |
| High school graduate or higher (age 25+) | 94.0% ±2.9 pts | 92.6% |
| Bachelor's degree or higher (age 25+) | 37.7% ±8.3 pts | 39.7% |
| Graduate or professional degree (age 25+) | 12.7% ±5.7 pts | 17.2% |
| Lived in the same house a year earlier | 98.2% ±1.0 pts | 88.9% |
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 121 earn?
Half of the 1,258 households in Census Tract 121 earn less than $91,202 a year (±$22,383), against $91,166 across New Castle County: 63rd highest of the county's 141 tracts with a reliable estimate.
| Measure | Tract 121 | New Castle County |
|---|---|---|
| Median household income | $91,202 ±$22,383 | $91,166 |
| Mean household income | $134,395 ±$21,756 | $120,512 |
| Per capita income | $50,632 ±$7,536 | $47,777 |
| People below the poverty line | 0.6% ±0.8 pts | 10.1% |
| Children under 18 below the poverty line | 0.0% ±5.4 pts | 13.7% |
| Households receiving SNAP | 16.2% ±10.2 pts | 9.8% |
| Households with a computer | 98.6% ±1.1 pts | 96.8% |
| Households with a broadband subscription | 97.7% ±1.8 pts | 93.2% |
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 121?
Owners occupy 66.7% of Census Tract 121's occupied homes and renters 33.3%. The median owner-occupied home is valued at $337,200 by its owner (±$27,420). The median renter pays $1,700 a month including utilities.
| Measure | Tract 121 | New Castle County |
|---|---|---|
| Median home value (owner-occupied) | $337,200 ±$27,420 | $352,200 |
| Median gross rent | $1,700 ±$248 | $1,448 |
| Renters paying 35% or more of income on rent | 28.2% ±25.7 pts | 38.9% |
| Median monthly owner costs, with a mortgage | $1,834 ±$83 | $1,882 |
| Owner-occupied homes | 66.7% ±12.3 pts | 69.0% |
| Renter-occupied homes | 33.3% ±12.3 pts | 31.0% |
| Housing units | 1,354 ±175 | 236,079 |
| Single-family detached homes | 71.4% ±8.5 pts | 53.0% |
| Mobile homes | 0.0% ±2.7 pts | 2.0% |
| Built 2020 or later | 0.0% ±2.7 pts | 1.3% |
| Built 2010 to 2019 | 8.3% ±7.8 pts | 7.5% |
| Built 1939 or earlier | 5.3% ±2.6 pts | 10.8% |
| Households with no vehicle | 0.6% ±0.9 pts | 7.5% |
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 121 get to work?
86.2% of Census Tract 121's workers drive alone. The average trip to work takes 20.2 minutes. The unemployment rate in 2020-2024 averaged 3.8%.
| Measure | Tract 121 | New Castle County |
|---|---|---|
| In the labor force (age 16+) | 78.2% ±4.8 pts | 65.7% |
| Unemployment rate | 3.8% ±2.3 pts | 4.8% |
| Drove alone to work | 86.2% ±4.7 pts | 68.6% |
| Carpooled | 5.7% ±3.1 pts | 7.3% |
| Public transportation | 0.0% ±1.8 pts | 2.6% |
| Walked | 0.0% ±1.8 pts | 2.2% |
| Worked from home | 7.5% ±5.0 pts | 17.6% |
| Mean travel time to work | 20.2 min ±1.8 | 25.3 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 121 compare with the other tracts in New Castle County?
Among New Castle County's tracts with a reliable estimate, Census Tract 121 ranks as shown below (1 = highest).
| Measure | In New Castle County |
|---|---|
| Population | 82nd of 143 |
| Residents per square mile | 86th of 144 |
| Median household income | 63rd of 141 |
| Per capita income | 53rd of 143 |
| Median home value | 67th of 137 |
| Median gross rent | 38th of 127 |
| Bachelor's degree or higher | 66th of 139 |
| Median age | 105th of 143 |
| Owner-occupied share | 83rd of 142 |
The tracts next to it on New Castle County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 130 | 60th | $91,250±$19,493 · within the margin of this tract |
| Tract 139.05 | 60th | $91,250±$17,799 · within the margin of this tract |
| Tract 147.05 | 62nd | $91,208±$24,130 · within the margin of this tract |
| Tract 121 | 63rd | $91,202±$22,383 |
| Tract 142 | 64th | $90,625±$21,130 · within the margin of this tract |
| Tract 136.14 | 65th | $90,534±$16,272 · within the margin of this tract |
| Tract 169.04 | 66th | $89,875±$24,492 · 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 121?
3 of the 18 figures for Census Tract 121 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