Demographics of DeKalb County, Missouri

DeKalb County, Missouri had 9,795 people on July 1, 2025, by the Census Bureau’s estimate: −1,810 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.

DeKalb County, in four figures

9,795
Population: July 1, 2025, Vintage 2025 estimate.; −15.6%
Change since July 2020: −1,810 people.; 42.2 ±0.7
Median age: ACS 2020–⁠2024.; $69,826 ±$11,753
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.

DeKalb County, Missouri's population shrank 15.6% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of DeKalb County, Missouri'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

DeKalb County, Missouri's population shrank 15.6% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of DeKalb County, Missouri'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	11,605	100.0	100.0
2021	11,700	100.8	100.2
2022	11,299	97.4	100.7
2023	9,893	85.2	101.6
2024	9,882	85.2	102.5
2025	9,795	84.4	103.1

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Population of DeKalb County, Missouri on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	11,605	+576	−7	0	+696
2021	11,700	+95	−68	−1	+164
2022	11,299	−401	−53	−6	−373
2023	9,893	−1,406	−44	+2	−1,423
2024	9,882	−11	−48	+21	+18
2025	9,795	−87	−49	+16	−54

Age, 2020–2024

The median age is 42.2 ±0.7: for men 40.4 ±1.3 and for women 45.0 ±0.6. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in DeKalb County by age, ACS 2020–2024
Age	People	Share	Missouri	United States
Under 5	579 ±28	5.3% ±0.3	5.8% ±<0.1	5.6% ±<0.1
5 to 17	1,573 ±155	14.5% ±1.4	16.6% ±0.1	16.3% ±<0.1
18 to 24	774 ±101	7.1% ±0.9	9.1% ±0.1	9.1% ±<0.1
25 to 44	2,972 ±183	27.3% ±1.7	26.0% ±0.1	26.9% ±<0.1
45 to 64	2,853 ±169	26.2% ±1.6	24.6% ±0.1	24.8% ±<0.1
65 and over	2,125 ±204	19.5% ±1.9	17.9% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $69,826 ±$11,753, and income per person $28,990 ±$2,063, in 2024 dollars. The median is $70,702 ±$325 in Missouri and $80,734 ±$166 in the United States.

Households by income

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Households in DeKalb County by income, ACS 2020–2024
Household income	Households	Share	Missouri	United States
Under $25,000	696 ±259	18.6% ±5.8	15.8% ±0.2	14.6% ±<0.1
$25,000 to $49,999	643 ±191	17.2% ±3.7	19.6% ±0.2	16.7% ±<0.1
$50,000 to $74,999	611 ±167	16.4% ±3.0	17.4% ±0.2	15.5% ±<0.1
$75,000 to $99,999	722 ±166	19.3% ±2.0	13.2% ±0.2	12.6% ±<0.1
$100,000 to $149,999	604 ±141	16.2% ±1.8	17.1% ±0.2	17.5% ±<0.1
$150,000 to $199,999	252 ±103	6.8% ±2.4	8.2% ±0.1	9.6% ±<0.1
$200,000 or more	204 ±84	5.5% ±2.0	8.7% ±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 DeKalb County by age, ACS 2020–2024
Age	Below poverty	Rate	Missouri	United States
All ages	773 ±209	8.7% ±2.3	12.6% ±0.2	12.5% ±0.1
Under 18	81 to 245	7.8% ±3.9	15.8% ±0.4	16.1% ±0.1
18 to 59	389 ±159	8.9% ±3.6	12.0% ±0.2	11.6% ±0.1
60 and over	221 ±73	9.0% ±2.9	10.9% ±0.2	11.0% ±<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%.

Housing, 2020–2024

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Housing in DeKalb County, ACS 2020–2024
Measure	DeKalb County	Missouri	United States
Housing units	4,270 ±755	2,825,287 ±1,043	143,775,355 ±10,234
Occupied	87.4% ±9.2	88.8% ±0.2	89.9% ±0.1
Vacant	12.6% ±2.6	11.2% ±0.2	10.1% ±0.1
Owner occupied	71.1% ±15.7	68.1% ±0.3	65.2% ±0.3
Renter occupied	12.8% to 44.9%	31.9% ±0.2	34.8% ±0.1
Median home value	$169,200 ±$13,541	$230,300 ±$880	$332,700 ±$236
Median gross rent	$817 ±$82	$1,033 ±$6	$1,413 ±$2
Median year built	1982 ±4	1978 ±1	1980 ±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%.

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 DeKalb County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Missouri	United States
Hispanic or Latino	258 ±0	2.4% ±<0.1	5.2% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	9,465 ±109	87.0% ±1.0	76.3% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	710 ±137	6.5% ±1.3	10.9% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	2 to 122	< 0.1% to 1.1%	2.1% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	10 to 46	0.1% to 0.4%	0.2% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 19	0% to 0.2%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 36	0% to 0.3%	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	167 to 503	1.5% to 4.6%	4.8% ±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 DeKalb County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Missouri	United States
Born in the state	8,131 ±295	74.8% ±2.7	65.6% ±0.2	57.3% ±<0.1
Born in another state	2,519 ±298	23.2% ±2.7	29.1% ±0.1	26.9% ±<0.1
Born a citizen outside the states	0 to 67	0% to 0.6%	0.8% ±<0.1	1.7% ±<0.1
Born abroad	195 ±93	1.8% ±0.9	4.5% ±0.1	14.1% ±<0.1
Naturalized citizens	0 to 118	0% to 1.1%	2.3% ±0.1	7.4% ±<0.1
Not citizens	48 to 230	0.4% to 2.1%	2.2% ±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%.

DeKalb County among the counties of Missouri

87th of 115 by population, July 2025. Every one is listed on the Missouri page.

Counties of Missouri near DeKalb County in population, July 2025
County	July 2025	Change since 2020
Bollinger County	10,646	+0.9%
Ralls County	10,444	+0.9%
Howard County	10,180	+0.3%
St. Clair County	9,976	+6.7%
Lewis County	9,879	−1.6%
DeKalb County	9,795	−15.6%
Grundy County	9,744	−0.2%
Iron County	9,318	−2.0%
Ozark County	9,172	+7.7%
Hickory County	9,044	+8.9%
Caldwell County	9,012	+2.1%

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