Census tract · St. Lucie County
Census Tract 3821.21, St. Lucie County, Florida
Census Tract 3821.21, GEOID 12111382121, in St. Lucie County, Florida, entirely within Port St. Lucie. 4,250 residents in the ACS 2020-2024 5-year estimates (±968); the 2020 Census counted 4,096.
Residents, 2020-2024
4,250
±968 (90% margin)
2020 Census count: 4,096
Median household income
$89,803
±$21,645 (90% margin)
St. Lucie County: $71,457
Median home value
$388,200
±$31,426 (90% margin)
St. Lucie County: $347,300
Median gross rent
$1,827
±$362 (90% margin)
St. Lucie County: $1,585
Where is Census Tract 3821.21?
Census Tract 3821.21 is one of 68 census tracts in St. Lucie County, Florida. It covers 1.92 square miles of land, 2,130 residents per square mile in 2020. Its GEOID, 12111382121, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Port St. Lucie | 100% |
5 census tracts border Census Tract 3821.21: Tract 3815.05 ($82,146), Tract 3820.08 ($71,032), Tract 3821.20 ($97,253), Tract 3821.22 ($59,004) and Tract 3821.29 ($66,519). 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 3821.21?
The 2020-2024 American Community Survey puts Census Tract 3821.21's population at 4,250 (±968) in 1,701 households; the 2020 Census counted 4,096 residents and 2,023 housing units.
| Measure | Tract 3821.21 | Port St. Lucie |
|---|---|---|
| Total population | 4,250 ±968 | 232,491 |
| Households | 1,701 ±202 | 83,952 |
| Average household size | 2.50 ±0.44 | 2.76 |
| Housing units | 1,883 ±182 | 90,911 |
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 3821.21?
The median resident of Census Tract 3821.21 is 46.4 years old; 18.2% are under 18 and 30.6% are 65 or older. The largest group is non-Hispanic white residents at 61.2%, then Hispanic or Latino residents (of any race) at 24.9%. 13.7% of residents were born outside the United States.
| Measure | Tract 3821.21 | Port St. Lucie |
|---|---|---|
| Median age | 46.4 ±17.0 | 43.9 |
| Under 18 years | 18.2% ±7.3 pts | 20.4% |
| 65 years and over | 30.6% ±8.4 pts | 21.8% |
| Hispanic or Latino (any race) | 24.9% ±15.6 pts | 24.0% |
| White alone, not Hispanic | 61.2% ±13.3 pts | 50.4% |
| Black or African American alone, not Hispanic | 11.6% ±4.3 pts | 19.0% |
| Asian alone, not Hispanic | 0.8% ±0.7 pts | 2.1% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±1.2 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±1.2 pts | 0.0% |
| Two or more races, not Hispanic | 1.5% ±1.8 pts | 3.6% |
| Some other race alone, not Hispanic | 0.0% ±1.2 pts | 0.6% |
| Born outside the United States | 13.7% ±6.6 pts | 19.7% |
| Speak a language other than English at home (age 5+) | 29.4% ±17.5 pts | 26.7% |
| Civilian veterans (age 18+) | 6.0% ±3.7 pts | 8.6% |
| With a disability | 10.8% ±4.1 pts | 14.0% |
| No health insurance coverage | 9.1% ±7.3 pts | 10.3% |
| High school graduate or higher (age 25+) | 96.0% ±3.3 pts | 91.7% |
| Bachelor's degree or higher (age 25+) | 37.9% ±8.6 pts | 28.1% |
| Graduate or professional degree (age 25+) | 12.2% ±5.9 pts | 9.8% |
| Lived in the same house a year earlier | 73.0% ±17.6 pts | 89.9% |
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 3821.21 earn?
Half of the 1,701 households in Census Tract 3821.21 earn less than $89,803 a year (±$21,645), against $71,457 across St. Lucie County: 14th highest of the county's 65 tracts with a reliable estimate.
| Measure | Tract 3821.21 | Port St. Lucie |
|---|---|---|
| Median household income | $89,803 ±$21,645 | $80,648 |
| Mean household income | $103,089 ±$11,164 | $100,929 |
| Per capita income | $42,677 ±$5,967 | $37,828 |
| People below the poverty line | 2.8% ±2.8 pts | 9.5% |
| Children under 18 below the poverty line | 0.0% ±6.8 pts | 12.8% |
| Households receiving SNAP | 3.7% ±3.8 pts | 10.8% |
| Households with a computer | 99.7% ±0.4 pts | 97.9% |
| Households with a broadband subscription | 97.1% ±2.0 pts | 94.9% |
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 3821.21?
Owners occupy 74.8% of Census Tract 3821.21's occupied homes and renters 25.2%. The median owner-occupied home is valued at $388,200 by its owner (±$31,426). The median renter pays $1,827 a month including utilities.
| Measure | Tract 3821.21 | Port St. Lucie |
|---|---|---|
| Median home value (owner-occupied) | $388,200 ±$31,426 | $369,200 |
| Median gross rent | $1,827 ±$362 | $1,937 |
| Renters paying 35% or more of income on rent | 11.7% ±11.1 pts | 48.8% |
| Median monthly owner costs, with a mortgage | $1,986 ±$1,049 | $1,954 |
| Owner-occupied homes | 74.8% ±7.8 pts | 84.0% |
| Renter-occupied homes | 25.2% ±7.8 pts | 16.0% |
| Housing units | 1,883 ±182 | 90,911 |
| Single-family detached homes | 77.5% ±8.9 pts | 87.1% |
| Mobile homes | 0.0% ±2.7 pts | 1.7% |
| Built 2020 or later | 0.0% ±2.7 pts | 8.5% |
| Built 2010 to 2019 | 3.7% ±3.4 pts | 13.3% |
| Built 1939 or earlier | 0.4% ±0.7 pts | 0.1% |
| Households with no vehicle | 0.0% ±3.0 pts | 2.7% |
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 3821.21 get to work?
69.3% of Census Tract 3821.21's workers drive alone and 28.0% work from home. The average trip to work takes 25.6 minutes.
| Measure | Tract 3821.21 | Port St. Lucie |
|---|---|---|
| In the labor force (age 16+) | 53.2% ±9.3 pts | 59.0% |
| Unemployment rate | 10.7% ±11.5 pts | 6.0% |
| Drove alone to work | 69.3% ±11.3 pts | 76.7% |
| Carpooled | 1.2% ±1.8 pts | 7.9% |
| Public transportation | 0.0% ±3.2 pts | 0.2% |
| Walked | 0.0% ±3.2 pts | 1.1% |
| Worked from home | 28.0% ±11.3 pts | 12.8% |
| Mean travel time to work | 25.6 min ±3.3 | 30.5 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 3821.21 compare with the other tracts in St. Lucie County?
Among St. Lucie County's tracts with a reliable estimate, Census Tract 3821.21 ranks as shown below (1 = highest).
| Measure | In St. Lucie County | In Port St. Lucie |
|---|---|---|
| Population | 40th of 66 | 31st of 38 |
| Residents per square mile | 34th of 67 | 27th of 38 |
| Median household income | 14th of 65 | 13th of 38 |
| Per capita income | 16th of 66 | 10th of 38 |
| Median home value | 20th of 64 | 16th of 38 |
| Median gross rent | 25th of 61 | 21st of 38 |
| Bachelor's degree or higher | 7th of 65 | 4th of 38 |
| Median age | 22nd of 66 | 9th of 38 |
| Owner-occupied share | 47th of 66 | 33rd of 38 |
The tracts next to it on St. Lucie County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 3821.23 | 11th | $92,198±$16,238 · within the margin of this tract |
| Tract 3821.25 | 12th | $91,175±$19,431 · within the margin of this tract |
| Tract 3821.26 | 13th | $89,849±$16,403 · within the margin of this tract |
| Tract 3821.21 | 14th | $89,803±$21,645 |
| Tract 3815.08 | 15th | $87,992±$22,037 · within the margin of this tract |
| Tract 3821.14 | 16th | $85,172±$8,006 · within the margin of this tract |
| Tract 3815.07 | 17th | $85,135±$53,274 · 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 3821.21?
2 of the 18 figures for Census Tract 3821.21 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