Demographics of Mercer County, Missouri

Mercer County, Missouri had 3,404 people on July 1, 2025, by the Census Bureau’s estimate: −112 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.

Mercer County, in four figures

3,404
Population: July 1, 2025, Vintage 2025 estimate.; −3.2%
Change since July 2020: −112 people.; 42.4 ±3.0
Median age: ACS 2020–⁠2024.; $62,679 ±$14,517
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.

Mercer County, Missouri's population shrank 3.2% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Mercer 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

Mercer County, Missouri's population shrank 3.2% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Mercer 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	3,516	100.0	100.0
2021	3,482	99.0	100.2
2022	3,471	98.7	100.7
2023	3,490	99.3	101.6
2024	3,414	97.1	102.5
2025	3,404	96.8	103.1

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Population of Mercer 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	3,516	−24	−7	0	−15
2021	3,482	−34	−11	+1	−24
2022	3,471	−11	−3	+6	−12
2023	3,490	+19	+13	+12	−6
2024	3,414	−76	−2	+16	−91
2025	3,404	−10	−2	+12	−20

Age, 2020–2024

The median age is 42.4 ±3.0: for men 39.9 ±2.0 and for women 43.7 ±1.0. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Mercer County by age, ACS 2020–2024
Age	People	Share	Missouri	United States
Under 5	260 ±30	7.5% ±0.9	5.8% ±<0.1	5.6% ±<0.1
5 to 17	594 ±101	17.1% ±2.9	16.6% ±0.1	16.3% ±<0.1
18 to 24	264 ±65	7.6% ±1.9	9.1% ±0.1	9.1% ±<0.1
25 to 44	698 ±75	20.0% ±2.1	26.0% ±0.1	26.9% ±<0.1
45 to 64	889 ±82	25.5% ±2.4	24.6% ±0.1	24.8% ±<0.1
65 and over	777 ±84	22.3% ±2.4	17.9% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $62,679 ±$14,517, and income per person $27,204 ±$2,329, 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 Mercer County by income, ACS 2020–2024
Household income	Households	Share	Missouri	United States
Under $25,000	256 ±63	19.7% ±4.7	15.8% ±0.2	14.6% ±<0.1
$25,000 to $49,999	273 ±59	21.0% ±4.3	19.6% ±0.2	16.7% ±<0.1
$50,000 to $74,999	230 ±57	17.7% ±4.3	17.4% ±0.2	15.5% ±<0.1
$75,000 to $99,999	255 ±57	19.6% ±4.2	13.2% ±0.2	12.6% ±<0.1
$100,000 to $149,999	216 ±55	16.6% ±4.1	17.1% ±0.2	17.5% ±<0.1
$150,000 to $199,999	21 to 65	1.6% to 5.0%	8.2% ±0.1	9.6% ±<0.1
$200,000 or more	10 to 48	0.8% to 3.7%	8.7% ±0.1	13.4% ±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%.

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 Mercer County by age, ACS 2020–2024
Age	Below poverty	Rate	Missouri	United States
All ages	461 ±185	13.5% ±5.4	12.6% ±0.2	12.5% ±0.1
Under 18	75 to 241	9.3% to 28.1%	15.8% ±0.4	16.1% ±0.1
18 to 59	172 ±69	10.9% ±4.3	12.0% ±0.2	11.6% ±0.1
60 and over	131 ±46	13.0% ±4.5	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 Mercer County, ACS 2020–2024
Measure	Mercer County	Missouri	United States
Housing units	1,902 ±20	2,825,287 ±1,043	143,775,355 ±10,234
Occupied	68.5% ±4.4	88.8% ±0.2	89.9% ±0.1
Vacant	31.5% ±4.5	11.2% ±0.2	10.1% ±0.1
Owner occupied	81.0% ±7.4	68.1% ±0.3	65.2% ±0.3
Renter occupied	19.0% ±4.4	31.9% ±0.2	34.8% ±0.1
Median home value	$104,900 ±$15,308	$230,300 ±$880	$332,700 ±$236
Median gross rent	$590 ±$150	$1,033 ±$6	$1,413 ±$2
Median year built	1970 ±3	1978 ±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 Mercer County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Missouri	United States
Hispanic or Latino	167 ±0	4.8% ±<0.1	5.2% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	3,173 ±29	91.1% ±0.8	76.3% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	0 to 25	0% to 0.7%	10.9% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	9 to 53	0.3% to 1.5%	2.1% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 24	0% to 0.7%	0.2% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 11	0% to 0.3%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 12	0% to 0.3%	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	91 ±38	2.6% ±1.1	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 Mercer County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Missouri	United States
Born in the state	2,150 ±136	61.7% ±3.9	65.6% ±0.2	57.3% ±<0.1
Born in another state	1,188 ±136	34.1% ±3.9	29.1% ±0.1	26.9% ±<0.1
Born a citizen outside the states	0 to 42	0% to 1.2%	0.8% ±<0.1	1.7% ±<0.1
Born abroad	125 ±44	3.6% ±1.3	4.5% ±0.1	14.1% ±<0.1
Naturalized citizens	5 to 59	0.1% to 1.7%	2.3% ±0.1	7.4% ±<0.1
Not citizens	93 ±45	2.7% ±1.3	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%.

Mercer County among the counties of Missouri

114th of 115 by population, July 2025. Every one is listed on the Missouri page.

Counties of Missouri near Mercer County in population, July 2025
County	July 2025	Change since 2020
Scotland County	4,796	+2.1%
Putnam County	4,546	−3.0%
Holt County	4,200	+0.4%
Schuyler County	4,140	+3.3%
Knox County	3,728	−0.1%
Mercer County	3,404	−3.2%
Worth County	1,914	−2.6%

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