Demographics of Marengo County, Alabama

Marengo County, Alabama had 18,311 people on July 1, 2025, by the Census Bureau’s estimate: −955 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.

Marengo County, in four figures

18,311
Population: July 1, 2025, Vintage 2025 estimate.; −5.0%
Change since July 2020: −955 people.; 41.4 ±1.5
Median age: ACS 2020–⁠2024.; $43,825 ±$5,429
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.

Marengo County, Alabama's population shrank 5.0% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Marengo County, Alabama'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

Marengo County, Alabama's population shrank 5.0% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Marengo County, Alabama'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	19,266	100.0	100.0
2021	18,974	98.5	100.2
2022	18,789	97.5	100.7
2023	18,672	96.9	101.6
2024	18,470	95.9	102.5
2025	18,311	95.0	103.1

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Population of Marengo County, Alabama on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	19,266	−55	−30	0	−26
2021	18,974	−292	−104	0	−189
2022	18,789	−185	−92	+21	−104
2023	18,672	−117	−93	+21	−42
2024	18,470	−202	−119	+55	−137
2025	18,311	−159	−123	+28	−63

Age, 2020–2024

The median age is 41.4 ±1.5: for men 39.4 ±2.0 and for women 44.1 ±2.2. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Marengo County by age, ACS 2020–2024
Age	People	Share	Alabama	United States
Under 5	1,129 ±53	6.0% ±0.3	5.8% ±<0.1	5.6% ±<0.1
5 to 17	3,025 ±330	16.0% ±1.8	16.5% ±0.1	16.3% ±<0.1
18 to 24	1,815 ±379	9.6% ±2.0	9.5% ±0.1	9.1% ±<0.1
25 to 44	4,009 ±362	21.3% ±1.9	25.3% ±0.1	26.9% ±<0.1
45 to 64	4,988 ±369	26.5% ±2.0	25.2% ±0.1	24.8% ±<0.1
65 and over	3,885 ±318	20.6% ±1.7	17.8% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $43,825 ±$5,429, and income per person $30,868 ±$2,993, in 2024 dollars. The median is $63,999 ±$399 in Alabama and $80,734 ±$166 in the United States.

Households by income

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Households in Marengo County by income, ACS 2020–2024
Household income	Households	Share	Alabama	United States
Under $25,000	2,716 ±375	34.4% ±4.6	19.7% ±0.3	14.6% ±<0.1
$25,000 to $49,999	1,555 ±287	19.7% ±3.6	20.3% ±0.3	16.7% ±<0.1
$50,000 to $74,999	815 ±175	10.3% ±2.2	16.7% ±0.2	15.5% ±<0.1
$75,000 to $99,999	956 ±223	12.1% ±2.8	12.7% ±0.2	12.6% ±<0.1
$100,000 to $149,999	954 ±197	12.1% ±2.5	15.5% ±0.2	17.5% ±<0.1
$150,000 to $199,999	411 ±145	5.2% ±1.8	7.4% ±0.2	9.6% ±<0.1
$200,000 or more	491 ±151	6.2% ±1.9	7.8% ±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 Marengo County by age, ACS 2020–2024
Age	Below poverty	Rate	Alabama	United States
All ages	4,072 ±628	21.9% ±3.4	15.6% ±0.2	12.5% ±0.1
Under 18	1,069 ±295	25.8% ±6.4	21.3% ±0.4	16.1% ±0.1
18 to 59	1,697 ±354	18.1% ±3.6	14.7% ±0.2	11.6% ±0.1
60 and over	1,306 ±254	25.6% ±4.5	12.4% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Marengo County, ACS 2020–2024
Measure	Marengo County	Alabama	United States
Housing units	9,867 ±20	2,337,265 ±430	143,775,355 ±10,234
Occupied	80.0% ±2.7	85.5% ±0.3	89.9% ±0.1
Vacant	20.0% ±2.7	14.5% ±0.3	10.1% ±0.1
Owner occupied	70.2% ±2.8	70.2% ±0.4	65.2% ±0.3
Renter occupied	29.8% ±4.0	29.8% ±0.3	34.8% ±0.1
Median home value	$107,400 ±$10,723	$209,900 ±$1,076	$332,700 ±$236
Median gross rent	$716 ±$69	$1,007 ±$8	$1,413 ±$2
Median year built	1982 ±2	1986 ±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 Marengo County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Alabama	United States
Hispanic or Latino	506 ±0	2.7% ±<0.1	5.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	8,349 ±10	44.3% ±0.1	63.4% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	9,576 ±125	50.8% ±0.7	25.6% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	15 to 83	0.1% to 0.4%	1.4% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 42	0% to 0.2%	0.3% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 21	0% to 0.1%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 21	0% to 0.1%	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	353 ±132	1.9% ±0.7	3.3% ±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 Marengo County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Alabama	United States
Born in the state	15,143 ±588	80.3% ±3.1	67.5% ±0.2	57.3% ±<0.1
Born in another state	3,373 ±580	17.9% ±3.1	27.6% ±0.2	26.9% ±<0.1
Born a citizen outside the states	0 to 62	0% to 0.3%	1.0% ±<0.1	1.7% ±<0.1
Born abroad	305 ±66	1.6% ±0.4	4.0% ±0.1	14.1% ±<0.1
Naturalized citizens	42 to 230	0.2% to 1.2%	1.6% ±0.1	7.4% ±<0.1
Not citizens	65 to 273	0.3% to 1.4%	2.4% ±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%.

Marengo County among the counties of Alabama

48th of 67 by population, July 2025. Every one is listed on the Alabama page.

Counties of Alabama near Marengo County in population, July 2025
County	July 2025	Change since 2020
Randolph County	23,163	+4.8%
Bibb County	22,262	+0.4%
Clarke County	22,014	−4.2%
Monroe County	18,965	−3.8%
Henry County	18,394	+7.1%
Marengo County	18,311	−5.0%
Pickens County	18,221	−3.9%
Macon County	18,132	−6.8%
Butler County	18,100	−4.8%
Cleburne County	15,970	+6.0%
Fayette County	15,872	−2.8%

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