Counties in New Mexico by population

Name: Counties in New Mexico by population, 2021
Creator: U.S. Census Bureau
License: Public domain (US federal government work, citation requested)

Bernalillo County had the highest population of 33 counties in 2021, at 675,490. Harding County had the lowest, at 631. The median was 27,032 and the figure for New Mexico was 2.12 million. Source: the U.S. Census Bureau.

Highest675,490Bernalillo County

Lowest631Harding County

Median27,03233 counties

New Mexico2,117,300History

All counties, 2021

CSV Chart (SVG)

persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

Rank	Counties	2021 persons	Change on 2020
1	Bernalillo County	675,490	-0.2%
2	Doña Ana County	221,734	+0.8%
3	Santa Fe County	155,503	+0.3%
4	Sandoval County	151,465	+1.5%
5	San Juan County	121,005	-0.3%
6	Valencia County	77,461	+1.3%
7	Lea County	73,068	-2.1%
8	McKinley County	71,380	-1.6%
9	Otero County	68,516	+1%
10	Chaves County	64,669	-0.7%
11	Eddy County	60,880	-2.3%
12	Curry County	47,960	-0.9%
13	Rio Arriba County	40,193	-0.1%
14	Taos County	34,694	+0.7%
15	Grant County	27,891	-1.1%
16	San Miguel County	27,158	+0.1%
17	Cibola County	27,032	+0.3%
18	Luna County	25,458	0%
19	Lincoln County	20,396	+0.4%
20	Los Alamos County	19,396	-0.1%
21	Roosevelt County	18,996	-0.8%
22	Socorro County	16,300	-1.5%
23	Torrance County	15,316	+1.7%
24	Colfax County	12,356	0%
25	Sierra County	11,527	-0.3%
26	Quay County	8,627	-1%
27	Guadalupe County	4,428	-0.3%
28	Mora County	4,189	-0%
29	Union County	4,097	+0.7%
30	Hidalgo County	4,084	-1.9%
31	Catron County	3,714	+2.9%
32	De Baca County	1,686	-0.1%
33	Harding County	631	-3.2%

Other periods

About this ranking

Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.

For Denmark, Statistics Denmark counts the registered resident population on 1 January. Greenland and the Faroe Islands are excluded. The annual series selects the first-quarter reference date from FOLK1A. The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.

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Rank Counties in New Mexico by population using official data, and cite the source.

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Questions

Which county has the highest population?

Bernalillo County, with 675,490 in 2021, according to the U.S. Census Bureau.

Which county has the lowest population?

Harding County, with 631 in 2021.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). Retrieved 2026-10-08.