Township · Indiana
Decatur Township, Indiana
Decatur Township, township, in Marion County, Indiana. Decatur Township had 37,678 residents on July 1, 2025 by the Census Bureau's estimate, up 2.0% since 2020; the 2020 Census counted 36,951 and the ACS 2020-2024 5-year estimates put it at 36,938 (±50). GEOID 1809717092.
Residents, July 2025 estimate
37,678
Census Bureau estimate (no margin published)
2020 Census count: 36,951 · ACS 2020-2024: 36,938 ±50
Median household income
$70,206
±$5,586 (90% margin)
Indiana: $71,957
Median home value
$210,300
±$9,213 (90% margin)
Indiana: $218,200
Median gross rent
$1,274
±$101 (90% margin)
Indiana: $1,062
Where is Decatur Township and what county is it in?
Decatur Township is a township in Marion County, Indiana. It covers 32.3 square miles of land, 1,145 residents per square mile in 2020.
Part of Indianapolis (city) also lies in it.
Decatur Township is in the Indianapolis-Carmel-Greenwood, IN metropolitan statistical area, which takes in 11 counties (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Decatur Township, and is it growing?
The Census Bureau estimates that 37,678 people lived in Decatur Township on July 1, 2025, up 2.0% since 2020, slower than Indiana (+2.8%). The 2020 Census counted 36,951 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 36,938 (±50).
| Measure | Decatur Township | Marion County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 36,938±50 | 975,809 | +2,710 |
| Households | 13,122±688 | 400,432 | +1,503 |
| Average household size | 2.80±0.15 | 2.40 | no clear change |
| Housing units | 13,769±648 | 441,040 | +1,084 |
Decatur Township's population since 2000
From 24,726 in 2000 to 37,678 in 2025: up 52.4%. The 2000, 2010 and 2020 figures are census counts, each for Decatur Township as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Decatur Township?
The median resident of Decatur Township is 32.7 years old; 28.1% are under 18 and 9.4% are 65 or older. The largest group is non-Hispanic white residents at 65.3%, then non-Hispanic Black residents at 18.1%. 12.9% of residents were born outside the United States.
| Measure | Decatur Township | Marion County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 32.7±1.2 | 34.4 | no clear change |
| Under 18 years | 28.1%±1.8 pts | 25.0% | – |
| 65 years and over | 9.4%±1.2 pts | 13.2% | – |
| Male | 51.8%±2.0 pts | 48.4% | – |
| Hispanic or Latino (any race) | 11.0%±3.2 pts | 13.8% | +4.0 pts |
| White alone, not Hispanic | 65.3%±4.9 pts | 49.5% | −13.4 pts |
| Black or African American alone, not Hispanic | 18.1%±3.6 pts | 27.1% | +6.8 pts |
| Asian alone, not Hispanic | 0.5%±0.3 pts | 4.0% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±0.1 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.1 pts | 0.0% | – |
| Two or more races, not Hispanic | 4.3%±1.7 pts | 4.9% | – |
| Some other race alone, not Hispanic | 0.8%±0.4 pts | 0.6% | – |
| Born outside the United States | 12.9%±3.6 pts | 12.6% | +7.1 pts |
| Speak a language other than English at home (age 5+) | 14.4%±3.0 pts | 18.2% | – |
| Civilian veterans (age 18+) | 5.9%±1.4 pts | 5.5% | – |
| With a disability | 15.0%±2.3 pts | 13.9% | – |
| No health insurance coverage | 7.5%±1.6 pts | 8.8% | no clear change |
| High school graduate or higher (age 25+) | 88.4%±2.6 pts | 88.1% | – |
| Bachelor's degree or higher (age 25+) | 20.5%±3.1 pts | 34.8% | +6.3 pts |
| Graduate or professional degree (age 25+) | 5.1%±1.4 pts | 12.7% | – |
| Lived in the same house a year earlier | 84.5%±3.6 pts | 85.7% | – |
| Moved from another state in the past year | 2.2%±1.9 pts | 1.9% | – |
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 Decatur Township earn?
Half of Decatur Township's 13,122 households earn less than $70,206 a year (±$5,586), against $66,346 in Marion County and $71,957 in Indiana. In 2015-2019 it was $71,674 in 2024 dollars; the margins of error cannot tell the two periods apart. 17.4% of residents live below the poverty line.
| Measure | Decatur Township | Marion County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $70,206±$5,586 | $66,346 | no clear change |
| Mean household income | $81,278±$4,935 | $90,675 | – |
| Per capita income | $28,904±$1,914 | $37,704 | no clear change |
| People below the poverty line | 17.4%±3.3 pts | 15.3% | no clear change |
| Children under 18 below the poverty line | 25.8%±6.6 pts | 21.5% | no clear change |
| Households receiving SNAP | 15.1%±5.2 pts | 12.5% | – |
| Households with a computer | 98.1%±0.8 pts | 95.9% | – |
| Households with a broadband subscription | 93.1%±2.0 pts | 91.8% | – |
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 Decatur Township?
Owners occupy 61.6% of Decatur Township's occupied homes and renters 38.4%. The median owner-occupied home is valued at $210,300 by its owner (±$9,213). The median renter pays $1,274 a month including utilities, and 40.1% of renters pay 35% or more of their income on rent.
| Measure | Decatur Township | Marion County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $210,300±$9,213 | $224,000 | +$63,847 |
| Median gross rent | $1,274±$101 | $1,153 | +$129 |
| Renters paying 35% or more of income on rent | 40.1%±8.6 pts | 41.7% | no clear change |
| Median monthly owner costs, with a mortgage | $1,373±$65 | $1,453 | – |
| Owner-occupied homes | 61.6%±4.3 pts | 56.5% | no clear change |
| Renter-occupied homes | 38.4%±4.3 pts | 43.5% | – |
| Housing units | 13,769±648 | 441,040 | +1,084 |
| Homeowner vacancy rate | 1.7%±1.4 pts | 1.2% | – |
| Rental vacancy rate | 3.9%±2.7 pts | 4.9% | – |
| Single-family detached homes | 72.0%±4.8 pts | 59.2% | – |
| Mobile homes | 5.4%±1.4 pts | 1.5% | – |
| Built 2020 or later | 2.1%±1.4 pts | 1.1% | – |
| Built 2010 to 2019 | 14.0%±5.2 pts | 6.6% | – |
| Built 1939 or earlier | 5.3%±1.9 pts | 15.0% | – |
| Households with no vehicle | 8.0%±5.0 pts | 8.3% | – |
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 Decatur Township work and get to work?
78.1% of Decatur Township's workers drive alone and 7.1% work from home. The average trip to work takes 26.3 minutes. The unemployment rate in 2020-2024 averaged 6.7%.
| Measure | Decatur Township | Marion County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 71.7%±3.0 pts | 68.7% | – |
| Unemployment rate | 6.7%±2.5 pts | 5.0% | no clear change |
| Drove alone to work | 78.1%±4.2 pts | 72.0% | – |
| Carpooled | 13.0%±4.1 pts | 9.6% | – |
| Public transportation | 0.4%±0.4 pts | 1.3% | – |
| Walked | 0.2%±0.2 pts | 1.7% | – |
| Worked from home | 7.1%±1.7 pts | 13.9% | +4.5 pts |
| Mean travel time to work | 26.3 min±1.7 | 24.5 min | no clear change |
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 census tracts are in Decatur Township?
8 census tracts lie mostly in Decatur Township, and 2 more reach into it (2020 census blocks). Their median household incomes run from $44,142 (Tract 3703.05) to $87,262 (Tract 3703.03).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 3703.03Marion County | 7,548 | $87,262 |
| Tract 3702.03Marion County | 5,099 | $48,578 |
| Tract 3703.06Marion County | 4,740 | $86,954 |
| Tract 3908.02Marion County | 4,431 | $70,691 |
| Tract 3703.04Marion County | 4,046 | $81,250 |
| Tract 3703.05Marion County | 3,925 | $44,142 |
| Tract 3702.01Marion County | 3,535 | $53,333 |
| Tract 3702.04Marion County | 3,614 | $67,631 |
| Tract 3801.03Marion County | 9,569 | $90,745 |
| Tract 3422Marion County | 4,877 | $49,405 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Decatur Township) · Census block assignment files
How does Decatur Township compare with other places in Indiana?
By the Census Bureau's July 2025 estimates, Decatur Township is the 261st-most populous of the 16,079 U.S. towns and townships that have one and the 48th-most populous of 1,001 in Indiana.
Decatur Township ranks 579th of 1,072 places in Indiana with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 48th | 1,001 |
| Growth 2020-2025 (PEP) | 384th | 1,056 |
| Residents per square mile | 282nd | 1,088 |
| Median household income | 579th | 1,072 |
| Per capita income | 896th | 1,087 |
| Median home value | 437th | 1,075 |
| Median gross rent | 91st | 904 |
| Poverty rate | 133rd | 736 |
| Bachelor's degree or higher | 511th | 1,029 |
| Median age | 1,009th | 1,083 |
| Owner-occupied share | 984th | 1,087 |
| Work from home | 393rd | 595 |
| Travel time to work | 466th | 1,088 |
Decatur Township's figures with every place in Indiana (CSV)
Every place in Indiana, sortable · Compare Decatur Township with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Decatur Township?
8 of the 57 figures for Decatur Township 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.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. 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 · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Decatur Township are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.