Demographics of Decatur County, Tennessee

Decatur County, Tennessee had 11,820 people on July 1, 2025, by the Census Bureau’s estimate: +391 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Decatur County, in four figures

11,820
Population: July 1, 2025, Vintage 2025 estimate.; +3.4%
Change since July 2020: +391 people.; 45.8 ±0.3
Median age: ACS 2020–⁠2024.; $45,375 ±$5,287
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Decatur County, Tennessee's population grew 3.4% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Decatur County, Tennessee's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Decatur County, Tennessee's population grew 3.4% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Decatur County, Tennessee's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	11,429	100.0	100.0
2021	11,392	99.7	100.2
2022	11,527	100.9	100.7
2023	11,685	102.2	101.6
2024	11,738	102.7	102.5
2025	11,820	103.4	103.1

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Population of Decatur County, Tennessee on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	11,429	−5	−25	0	+22
2021	11,392	−37	−130	0	+89
2022	11,527	+135	−122	0	+245
2023	11,685	+158	−65	+14	+208
2024	11,738	+53	−93	+16	+130
2025	11,820	+82	−98	+12	+171

Age, 2020–2024

The median age is 45.8 ±0.3: for men 44.2 ±1.1 and for women 48.6 ±0.8. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Decatur County by age, ACS 2020–2024
Age	People	Share	Tennessee	United States
Under 5	599 ±44	5.2% ±0.4	5.8% ±<0.1	5.6% ±<0.1
5 to 17	1,736 ±148	15.0% ±1.3	16.4% ±0.1	16.3% ±<0.1
18 to 24	689 ±111	6.0% ±1.0	8.9% ±0.1	9.1% ±<0.1
25 to 44	2,587 ±178	22.3% ±1.5	26.7% ±0.1	26.9% ±<0.1
45 to 64	3,212 ±216	27.7% ±1.9	25.2% ±0.1	24.8% ±<0.1
65 and over	2,756 ±269	23.8% ±2.3	17.1% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $45,375 ±$5,287, and income per person $26,884 ±$2,057, in 2024 dollars. The median is $69,595 ±$429 in Tennessee and $80,734 ±$166 in the United States.

Households by income

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Households in Decatur County by income, ACS 2020–2024
Household income	Households	Share	Tennessee	United States
Under $25,000	1,162 ±214	25.4% ±4.5	16.6% ±0.2	14.6% ±<0.1
$25,000 to $49,999	1,274 ±228	27.9% ±4.8	19.4% ±0.2	16.7% ±<0.1
$50,000 to $74,999	699 ±127	15.3% ±2.7	17.3% ±0.2	15.5% ±<0.1
$75,000 to $99,999	607 ±136	13.3% ±2.9	13.2% ±0.2	12.6% ±<0.1
$100,000 to $149,999	505 ±120	11.1% ±2.6	16.8% ±0.2	17.5% ±<0.1
$150,000 to $199,999	176 ±72	3.9% ±1.6	7.7% ±0.1	9.6% ±<0.1
$200,000 or more	145 ±66	3.2% ±1.4	9.0% ±0.1	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Decatur County by age, ACS 2020–2024
Age	Below poverty	Rate	Tennessee	United States
All ages	2,523 ±447	22.1% ±3.9	13.8% ±0.2	12.5% ±0.1
Under 18	609 ±185	26.1% ±7.4	18.8% ±0.4	16.1% ±0.1
18 to 59	1,146 ±245	20.1% ±4.1	12.7% ±0.2	11.6% ±0.1
60 and over	768 ±177	22.8% ±4.9	11.4% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Decatur County, ACS 2020–2024
Measure	Decatur County	Tennessee	United States
Housing units	6,591 ±19	3,143,670 ±903	143,775,355 ±10,234
Occupied	69.3% ±3.3	89.8% ±0.2	89.9% ±0.1
Vacant	30.7% ±3.2	10.2% ±0.2	10.1% ±0.1
Owner occupied	74.3% ±3.1	66.9% ±0.3	65.2% ±0.3
Renter occupied	25.7% ±3.6	33.1% ±0.3	34.8% ±0.1
Median home value	$139,600 ±$16,377	$286,700 ±$1,492	$332,700 ±$236
Median gross rent	$757 ±$74	$1,189 ±$7	$1,413 ±$2
Median year built	1984 ±3	1987 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Decatur County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Tennessee	United States
Hispanic or Latino	429 ±0	3.7% ±<0.1	7.4% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	10,428 ±118	90.1% ±1.0	71.0% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	315 ±154	2.7% ±1.3	15.4% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	4 to 318	< 0.1% to 2.7%	1.9% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 22	0% to 0.2%	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 22	0% to 0.2%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 74	0% to 0.6%	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	98 to 336	0.8% to 2.9%	3.7% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Decatur County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Tennessee	United States
Born in the state	8,549 ±325	73.8% ±2.8	57.2% ±0.2	57.3% ±<0.1
Born in another state	2,648 ±318	22.9% ±2.7	35.7% ±0.2	26.9% ±<0.1
Born a citizen outside the states	30 to 188	0.3% to 1.6%	1.0% ±<0.1	1.7% ±<0.1
Born abroad	118 to 428	1.0% to 3.7%	6.1% ±0.1	14.1% ±<0.1
Naturalized citizens	34 to 136	0.3% to 1.2%	2.4% ±0.1	7.4% ±<0.1
Not citizens	51 to 325	0.4% to 2.8%	3.7% ±0.1	6.8% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Decatur County among the counties of Tennessee

87th of 95 by population, July 2025. Every one is listed on the Tennessee page.

Counties of Tennessee near Decatur County in population, July 2025
County	July 2025	Change since 2020
Grundy County	14,116	+4.2%
Crockett County	14,006	+0.7%
Lewis County	13,487	+7.0%
Trousdale County	12,623	+8.4%
Jackson County	12,466	+7.1%
Decatur County	11,820	+3.4%
Perry County	9,126	+8.9%
Houston County	8,479	+2.2%
Clay County	7,821	+3.1%
Hancock County	7,075	+6.7%
Moore County	6,920	+6.9%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026