Data / Rankings / Population / Counties in New Mexico

Counties in New Mexico by population

Bernalillo County had the highest population of 33 counties in 2020, at 676,867. Harding County had the lowest, at 652. The median was 26,963 and the figure for New Mexico was 2.12 million. Source: the U.S. Census Bureau.

Highest676,867Bernalillo County
Lowest652Harding County
Median26,96333 counties
New Mexico2,118,446History

All counties, 2020

CSVChart (SVG)

Bernalillo CountyBernalillo County: 676,867 persons676,867Doña Ana CountyDoña Ana County: 220,059 persons220,059Santa Fe CountySanta Fe County: 155,068 persons155,068Sandoval CountySandoval County: 149,271 persons149,271San Juan CountySan Juan County: 121,384 persons121,384Valencia CountyValencia County: 76,495 persons76,495Lea CountyLea County: 74,634 persons74,634McKinley CountyMcKinley County: 72,540 persons72,540Otero CountyOtero County: 67,868 persons67,868Chaves CountyChaves County: 65,154 persons65,154Eddy CountyEddy County: 62,344 persons62,344Curry CountyCurry County: 48,372 persons48,372Rio Arriba CountyRio Arriba County: 40,253 persons40,253Taos CountyTaos County: 34,459 persons34,459Grant CountyGrant County: 28,203 persons28,203San Miguel CountySan Miguel County: 27,134 persons27,134Cibola CountyCibola County: 26,963 persons26,963Luna CountyLuna County: 25,452 persons25,452Lincoln CountyLincoln County: 20,308 persons20,308Los Alamos CountyLos Alamos County: 19,414 persons19,414Roosevelt CountyRoosevelt County: 19,153 persons19,153Socorro CountySocorro County: 16,551 persons16,551Torrance CountyTorrance County: 15,059 persons15,059Colfax CountyColfax County: 12,354 persons12,354Sierra CountySierra County: 11,562 persons11,562Quay CountyQuay County: 8,714 persons8,714Guadalupe CountyGuadalupe County: 4,440 persons4,440Mora CountyMora County: 4,191 persons4,191Hidalgo CountyHidalgo County: 4,163 persons4,163Union CountyUnion County: 4,070 persons4,070Catron CountyCatron County: 3,608 persons3,608De Baca CountyDe Baca County: 1,687 persons1,687Harding CountyHarding County: 652 persons652
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2020
persons
1Bernalillo County676,867
2Doña Ana County220,059
3Santa Fe County155,068
4Sandoval County149,271
5San Juan County121,384
6Valencia County76,495
7Lea County74,634
8McKinley County72,540
9Otero County67,868
10Chaves County65,154
11Eddy County62,344
12Curry County48,372
13Rio Arriba County40,253
14Taos County34,459
15Grant County28,203
16San Miguel County27,134
17Cibola County26,963
18Luna County25,452
19Lincoln County20,308
20Los Alamos County19,414
21Roosevelt County19,153
22Socorro County16,551
23Torrance County15,059
24Colfax County12,354
25Sierra County11,562
26Quay County8,714
27Guadalupe County4,440
28Mora County4,191
29Hidalgo County4,163
30Union County4,070
31Catron County3,608
32De Baca County1,687
33Harding County652

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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Questions

Which county has the highest population?

Bernalillo County, with 676,867 in 2020, according to the U.S. Census Bureau.

Which county has the lowest population?

Harding County, with 652 in 2020.

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.

Population: other rankings

Counties in New Mexico: more rankings