Census tract · St. Clair County
Census Tract 6440, St. Clair County, Michigan
Census Tract 6440, GEOID 26147644000, in St. Clair County, Michigan, mostly within Marine City (94% of its census blocks). 4,070 residents in the ACS 2020-2024 5-year estimates (±54); the 2020 Census counted 4,228.
Residents, 2020-2024
4,070
±54 (90% margin)
2020 Census count: 4,228
Median household income
$68,232
±$14,318 (90% margin)
St. Clair County: $71,270
Median home value
$159,400
±$8,285 (90% margin)
St. Clair County: $224,600
Median gross rent
$944
±$110 (90% margin)
St. Clair County: $1,029
Where is Census Tract 6440?
Census Tract 6440 is one of 51 census tracts in St. Clair County, Michigan. It covers 2.25 square miles of land, 1,881 residents per square mile in 2020. Its GEOID, 26147644000, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Marine City | 94% |
| Cottrellville Township | 6% |
3 census tracts border Census Tract 6440: Tract 6410 ($98,879), Tract 6430 ($71,517) and Tract 6450 ($91,121). 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 6440?
The 2020-2024 American Community Survey puts Census Tract 6440's population at 4,070 (±54) in 2,042 households; the 2020 Census counted 4,228 residents and 2,057 housing units.
| Measure | Tract 6440 | Marine City |
|---|---|---|
| Total population | 4,070 ±54 | 4,028 |
| Households | 2,042 ±159 | 2,024 |
| Average household size | 1.99 ±0.15 | 1.99 |
| Housing units | 2,280 ±195 | 2,262 |
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 6440?
The median resident of Census Tract 6440 is 51.3 years old; 14.1% are under 18 and 29.3% are 65 or older. The largest group is non-Hispanic white residents at 93.8%, then non-Hispanic residents of some other race at 3.2%. 2.1% of residents were born outside the United States.
| Measure | Tract 6440 | Marine City |
|---|---|---|
| Median age | 51.3 ±3.5 | 51.1 |
| Under 18 years | 14.1% ±3.5 pts | 14.3% |
| 65 years and over | 29.3% ±5.2 pts | 29.1% |
| Hispanic or Latino (any race) | 1.5% ±1.2 pts | 1.4% |
| White alone, not Hispanic | 93.8% ±4.3 pts | 93.9% |
| Black or African American alone, not Hispanic | 0.0% ±0.7 pts | 0.0% |
| Asian alone, not Hispanic | 0.2% ±0.4 pts | 0.2% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.7 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.7 pts | 0.0% |
| Two or more races, not Hispanic | 1.3% ±1.0 pts | 1.3% |
| Some other race alone, not Hispanic | 3.2% ±3.8 pts | 3.2% |
| Born outside the United States | 2.1% ±1.2 pts | 2.1% |
| Speak a language other than English at home (age 5+) | 1.7% ±2.3 pts | 1.7% |
| Civilian veterans (age 18+) | 8.4% ±4.5 pts | 8.3% |
| With a disability | 19.0% ±4.5 pts | 19.0% |
| No health insurance coverage | 3.6% ±2.8 pts | 3.6% |
| High school graduate or higher (age 25+) | 88.6% ±4.3 pts | 88.4% |
| Bachelor's degree or higher (age 25+) | 18.1% ±5.5 pts | 18.4% |
| Graduate or professional degree (age 25+) | 8.9% ±4.1 pts | 9.0% |
| Lived in the same house a year earlier | 94.9% ±3.7 pts | 94.8% |
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 6440 earn?
Half of the 2,042 households in Census Tract 6440 earn less than $68,232 a year (±$14,318), against $71,270 across St. Clair County: 30th highest of the county's 49 tracts with a reliable estimate. 7.6% of residents live below the poverty line.
| Measure | Tract 6440 | Marine City |
|---|---|---|
| Median household income | $68,232 ±$14,318 | $67,683 |
| Mean household income | $86,025 ±$10,160 | $85,244 |
| Per capita income | $43,519 ±$5,854 | $43,130 |
| People below the poverty line | 7.6% ±3.4 pts | 7.6% |
| Children under 18 below the poverty line | 9.9% ±10.2 pts | 9.9% |
| Households receiving SNAP | 12.5% ±4.9 pts | 12.6% |
| Households with a computer | 92.9% ±3.9 pts | 92.8% |
| Households with a broadband subscription | 92.3% ±3.5 pts | 92.2% |
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 6440?
Owners occupy 80.9% of Census Tract 6440's occupied homes and renters 19.1%. The median owner-occupied home is valued at $159,400 by its owner (±$8,285). The median renter pays $944 a month including utilities, and 37.0% of renters pay 35% or more of their income on rent.
| Measure | Tract 6440 | Marine City |
|---|---|---|
| Median home value (owner-occupied) | $159,400 ±$8,285 | $159,800 |
| Median gross rent | $944 ±$110 | $944 |
| Renters paying 35% or more of income on rent | 37.0% ±18.1 pts | 37.0% |
| Median monthly owner costs, with a mortgage | $1,092 ±$88 | $1,090 |
| Owner-occupied homes | 80.9% ±5.6 pts | 80.7% |
| Renter-occupied homes | 19.1% ±5.6 pts | 19.3% |
| Housing units | 2,280 ±195 | 2,262 |
| Single-family detached homes | 77.5% ±6.9 pts | 77.4% |
| Mobile homes | 0.0% ±1.3 pts | 0.0% |
| Built 2020 or later | 0.0% ±1.3 pts | 0.0% |
| Built 2010 to 2019 | 0.4% ±0.6 pts | 0.4% |
| Built 1939 or earlier | 43.8% ±8.6 pts | 44.1% |
| Households with no vehicle | 2.7% ±2.2 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 6440 get to work?
87.9% of Census Tract 6440's workers drive alone and 4.5% work from home. The average trip to work takes 30.4 minutes.
| Measure | Tract 6440 | Marine City |
|---|---|---|
| In the labor force (age 16+) | 58.9% ±5.8 pts | 58.9% |
| Unemployment rate | 9.1% ±6.1 pts | 9.2% |
| Drove alone to work | 87.9% ±4.1 pts | 87.7% |
| Carpooled | 4.5% ±2.9 pts | 4.6% |
| Public transportation | 0.0% ±1.6 pts | 0.0% |
| Walked | 3.1% ±2.6 pts | 3.1% |
| Worked from home | 4.5% ±2.7 pts | 4.6% |
| Mean travel time to work | 30.4 min ±3.2 | 30.6 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 6440 compare with the other tracts in St. Clair County?
Among St. Clair County's tracts with a reliable estimate, Census Tract 6440 ranks as shown below (1 = highest).
| Measure | In St. Clair County |
|---|---|
| Population | 12th of 49 |
| Residents per square mile | 13th of 50 |
| Median household income | 30th of 49 |
| Per capita income | 11th of 49 |
| Median home value | 41st of 49 |
| Median gross rent | 30th of 41 |
| Poverty rate | 26th of 40 |
| Bachelor's degree or higher | 29th of 48 |
| Median age | 11th of 49 |
| Owner-occupied share | 29th of 49 |
The tracts next to it on St. Clair County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 6430 | 27th | $71,517±$7,801 · within the margin of this tract |
| Tract 6460 | 28th | $70,179±$18,428 · within the margin of this tract |
| Tract 6420 | 29th | $69,688±$13,933 · within the margin of this tract |
| Tract 6440 | 30th | $68,232±$14,318 |
| Tract 6280 | 31st | $67,933±$8,676 · within the margin of this tract |
| Tract 6501 | 32nd | $65,992±$8,346 · within the margin of this tract |
| Tract 6551 | 33rd | $63,889±$7,876 · 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 6440?
3 of the 18 figures for Census Tract 6440 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