Demographics of Jefferson County, New York

Jefferson County, New York had 111,540 people on July 1, 2025, by the Census Bureau’s estimate: −4,535 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.

Jefferson County, in four figures

111,540
Population: July 1, 2025, Vintage 2025 estimate.; −3.9%
Change since July 2020: −4,535 people.; 33.7 ±0.3
Median age: ACS 2020–⁠2024.; $66,301 ±$2,730
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.

Jefferson County, New York's population shrank 3.9% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Jefferson County, New York'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

Jefferson County, New York's population shrank 3.9% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Jefferson County, New York'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	116,075	100.0	100.0
2021	117,019	100.8	100.2
2022	115,493	99.5	100.7
2023	113,280	97.6	101.6
2024	112,795	97.2	102.5
2025	111,540	96.1	103.1

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Population of Jefferson County, New York on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	116,075	−635	+263	+5	−813
2021	117,019	+944	+785	+21	+78
2022	115,493	−1,526	+716	+208	−2,526
2023	113,280	−2,213	+575	+365	−3,214
2024	112,795	−485	+556	+349	−1,374
2025	111,540	−1,255	+555	+227	−2,009

Age, 2020–2024

The median age is 33.7 ±0.3: for men 31.9 ±0.3 and for women 35.9 ±0.3. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Jefferson County by age, ACS 2020–2024
Age	People	Share	New York	United States
Under 5	8,357 ±122	7.3% ±0.1	5.4% ±<0.1	5.6% ±<0.1
5 to 17	19,296 ±632	16.8% ±0.5	15.0% ±<0.1	16.3% ±<0.1
18 to 24	13,304 ±756	11.6% ±0.7	8.9% ±<0.1	9.1% ±<0.1
25 to 44	32,914 ±663	28.6% ±0.6	27.1% ±<0.1	26.9% ±<0.1
45 to 64	23,788 ±595	20.7% ±0.5	25.6% ±0.1	24.8% ±<0.1
65 and over	17,381 ±651	15.1% ±0.6	17.9% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $66,301 ±$2,730, and income per person $36,025 ±$1,152, in 2024 dollars. The median is $85,974 ±$402 in New York and $80,734 ±$166 in the United States.

Households by income

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Households in Jefferson County by income, ACS 2020–2024
Household income	Households	Share	New York	United States
Under $25,000	7,363 ±657	15.5% ±1.4	16.0% ±0.1	14.6% ±<0.1
$25,000 to $49,999	10,868 ±912	22.8% ±1.9	15.1% ±0.1	16.7% ±<0.1
$50,000 to $74,999	8,076 ±587	17.0% ±1.2	13.6% ±0.1	15.5% ±<0.1
$75,000 to $99,999	6,674 ±588	14.0% ±1.2	11.4% ±0.1	12.6% ±<0.1
$100,000 to $149,999	8,363 ±637	17.6% ±1.3	16.7% ±0.1	17.5% ±<0.1
$150,000 to $199,999	3,516 ±466	7.4% ±1.0	10.1% ±0.1	9.6% ±<0.1
$200,000 or more	2,746 ±319	5.8% ±0.7	17.1% ±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 Jefferson County by age, ACS 2020–2024
Age	Below poverty	Rate	New York	United States
All ages	15,052 ±1,599	13.7% ±1.5	14.0% ±0.2	12.5% ±0.1
Under 18	5,028 ±606	18.8% ±2.2	18.3% ±0.2	16.1% ±0.1
18 to 59	7,467 ±924	12.4% ±1.5	12.8% ±0.1	11.6% ±0.1
60 and over	2,557 ±342	11.0% ±1.4	13.1% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Jefferson County, ACS 2020–2024
Measure	Jefferson County	New York	United States
Housing units	61,862 ±110	8,585,241 ±652	143,775,355 ±10,234
Occupied	77.0% ±1.0	90.0% ±0.1	89.9% ±0.1
Vacant	23.0% ±1.0	10.0% ±0.1	10.1% ±0.1
Owner occupied	54.7% ±1.3	54.3% ±0.2	65.2% ±0.3
Renter occupied	45.3% ±1.8	45.7% ±0.1	34.8% ±0.1
Median home value	$188,200 ±$6,002	$423,800 ±$1,627	$332,700 ±$236
Median gross rent	$1,213 ±$32	$1,621 ±$7	$1,413 ±$2
Median year built	1972 ±2	1959 ±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 Jefferson County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	New York	United States
Hispanic or Latino	8,657 ±0	7.5% ±<0.1	19.8% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	92,228 ±366	80.2% ±0.3	52.8% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	4,981 ±514	4.3% ±0.4	13.4% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	2,159 ±259	1.9% ±0.2	9.0% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	50 to 212	< 0.1% to 0.2%	0.2% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	271 ±92	0.2% ±0.1	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	161 to 507	0.1% to 0.4%	1.0% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	6,279 ±683	5.5% ±0.6	3.8% ±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 Jefferson County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	New York	United States
Born in the state	74,596 ±1,081	64.8% ±0.9	62.4% ±0.1	57.3% ±<0.1
Born in another state	32,397 ±1,277	28.2% ±1.1	12.3% ±0.1	26.9% ±<0.1
Born a citizen outside the states	2,751 ±496	2.4% ±0.4	2.5% ±<0.1	1.7% ±<0.1
Born abroad	5,296 ±743	4.6% ±0.6	22.8% ±0.1	14.1% ±<0.1
Naturalized citizens	3,207 ±486	2.8% ±0.4	13.6% ±0.1	7.4% ±<0.1
Not citizens	2,089 ±443	1.8% ±0.4	9.2% ±0.1	6.8% ±<0.1

Jefferson County among the counties of New York

26th of 62 by population, July 2025. Every one is listed on the New York page.

Counties of New York near Jefferson County in population, July 2025
County	July 2025	Change since 2020
Schenectady County	162,581	+3.0%
Rensselaer County	160,510	−0.2%
Chautauqua County	124,126	−2.6%
Oswego County	118,569	+1.0%
Ontario County	113,130	+0.6%
Jefferson County	111,540	−3.9%
St. Lawrence County	105,488	−2.5%
Tompkins County	104,047	−1.4%
Putnam County	99,028	+1.4%
Steuben County	91,855	−1.6%
Wayne County	91,250	+0.1%

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