Demographics of Sierra County, New Mexico

Sierra County, New Mexico had 11,395 people on July 1, 2025, by the Census Bureau’s estimate: −167 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.

Sierra County, in four figures

11,395
Population: July 1, 2025, Vintage 2025 estimate.; −1.4%
Change since July 2020: −167 people.; 57.6 ±1.6
Median age: ACS 2020–⁠2024.; $41,600 ±$5,700
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.

Sierra County, New Mexico's population shrank 1.4% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Sierra County, New Mexico'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

Sierra County, New Mexico's population shrank 1.4% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Sierra County, New Mexico'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	11,562	100.0	100.0
2021	11,527	99.7	100.2
2022	11,490	99.4	100.7
2023	11,548	99.9	101.6
2024	11,413	98.7	102.5
2025	11,395	98.6	103.1

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Population of Sierra County, New Mexico on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	11,562	−10	−42	0	+36
2021	11,527	−35	−218	+4	+184
2022	11,490	−37	−212	−1	+170
2023	11,548	+58	−162	+3	+214
2024	11,413	−135	−168	+2	+31
2025	11,395	−18	−169	−10	+162

Age, 2020–2024

The median age is 57.6 ±1.6: for men 59.4 ±4.1 and for women 57.4 ±1.4. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Sierra County by age, ACS 2020–2024
Age	People	Share	New Mexico	United States
Under 5	193 to 673	1.7% to 5.9%	5.2% ±<0.1	5.6% ±<0.1
5 to 17	1,362 ±373	11.8% ±3.2	16.5% ±0.2	16.3% ±<0.1
18 to 24	202 to 690	1.8% to 6.0%	9.3% ±0.2	9.1% ±<0.1
25 to 44	2,040 ±371	17.7% ±3.2	26.0% ±0.2	26.9% ±<0.1
45 to 64	2,754 ±362	23.9% ±3.1	23.7% ±0.2	24.8% ±<0.1
65 and over	4,465 ±468	38.8% ±4.1	19.3% ±0.2	17.2% ±<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%.

Income and poverty, 2020–2024

Median household income is $41,600 ±$5,700, and income per person $26,453 ±$2,328, in 2024 dollars. The median is $64,059 ±$808 in New Mexico and $80,734 ±$166 in the United States.

Households by income

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Households in Sierra County by income, ACS 2020–2024
Household income	Households	Share	New Mexico	United States
Under $25,000	1,668 ±296	30.7% ±5.1	20.2% ±0.4	14.6% ±<0.1
$25,000 to $49,999	1,363 ±310	25.1% ±5.5	19.6% ±0.4	16.7% ±<0.1
$50,000 to $74,999	875 ±213	16.1% ±3.8	16.9% ±0.4	15.5% ±<0.1
$75,000 to $99,999	660 ±233	12.1% ±4.2	12.4% ±0.4	12.6% ±<0.1
$100,000 to $149,999	727 ±255	13.4% ±4.6	15.5% ±0.4	17.5% ±<0.1
$150,000 to $199,999	25 to 251	0.5% to 4.6%	7.6% ±0.2	9.6% ±<0.1
$200,000 or more	0 to 23	0% to 0.4%	7.8% ±0.2	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 Sierra County by age, ACS 2020–2024
Age	Below poverty	Rate	New Mexico	United States
All ages	2,412 ±585	21.4% ±5.2	17.8% ±0.4	12.5% ±0.1
Under 18	651 ±250	36.3% ±9.5	24.0% ±0.7	16.1% ±0.1
18 to 59	921 ±286	22.3% ±6.5	17.0% ±0.4	11.6% ±0.1
60 and over	840 ±207	15.7% ±3.7	14.3% ±0.4	11.0% ±<0.1

Housing, 2020–2024

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Housing in Sierra County, ACS 2020–2024
Measure	Sierra County	New Mexico	United States
Housing units	8,200 ±98	956,964 ±262	143,775,355 ±10,234
Occupied	66.3% ±4.1	87.5% ±0.3	89.9% ±0.1
Vacant	33.7% ±4.2	12.5% ±0.3	10.1% ±0.1
Owner occupied	71.8% ±4.6	70.0% ±0.4	65.2% ±0.3
Renter occupied	28.2% ±5.4	30.0% ±0.4	34.8% ±0.1
Median home value	$152,600 ±$15,687	$248,100 ±$1,957	$332,700 ±$236
Median gross rent	$729 ±$44	$1,067 ±$11	$1,413 ±$2
Median year built	1983 ±3	1985 ±2	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 Sierra County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	New Mexico	United States
Hispanic or Latino	3,431 ±0	29.8% ±<0.1	48.4% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	7,252 ±174	63.1% ±1.5	36.0% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	0 to 56	0% to 0.5%	1.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 102	0% to 0.9%	1.6% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 49	0% to 0.4%	8.5% ±0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 21	0% to 0.2%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 21	0% to 0.2%	0.5% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	763 ±208	6.6% ±1.8	3.1% ±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 Sierra County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	New Mexico	United States
Born in the state	5,007 ±506	43.5% ±4.4	52.4% ±0.4	57.3% ±<0.1
Born in another state	5,533 ±360	48.1% ±3.1	36.9% ±0.3	26.9% ±<0.1
Born a citizen outside the states	23 to 161	0.2% to 1.4%	1.3% ±0.1	1.7% ±<0.1
Born abroad	408 to 1,328	3.5% to 11.5%	9.4% ±0.2	14.1% ±<0.1
Naturalized citizens	92 to 300	0.8% to 2.6%	4.1% ±0.1	7.4% ±<0.1
Not citizens	204 to 1,140	1.8% to 9.9%	5.3% ±0.2	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%.

Sierra County among the counties of New Mexico

25th of 33 by population, July 2025. Every one is listed on the New Mexico page.

Counties of New Mexico near Sierra County in population, July 2025
County	July 2025	Change since 2020
Los Alamos County	19,407	> −0.1%
Roosevelt County	18,615	−2.8%
Torrance County	16,100	+6.9%
Socorro County	15,838	−4.3%
Colfax County	12,184	−1.4%
Sierra County	11,395	−1.4%
Quay County	8,454	−3.0%
Guadalupe County	4,343	−2.2%
Mora County	4,051	−3.3%
Hidalgo County	3,929	−5.6%
Union County	3,844	−5.6%

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