County Maps US

New Mexico County Map

New Mexico has 33 counties. Together they cover 121,313 sq mi of land and 2,125,498 people.

Neighbouring areas are given different colours so their shared borders read clearly. These colours carry no data.

Boundaries from the 2025 Census cartographic boundary file, generalised so that no point moves by more than half a pixel at this width. Select any area to open its page.
Counties
33
35th most of the 51 states and DC
Population
2,125,498
36th largest
Land area
121,313
square miles
Density
17.5
people per square mile, computed

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025. Retrieved 30 August 2026.

Download this map

Free to use and redistribute. The boundaries are public-domain Census Bureau data; attribution to County Maps US is appreciated but not required.

Satellite view

Aerial imagery of New Mexico with the state boundary drawn on top. County lines are not drawn here: at this scale they would bury the picture, and the map above already carries them.

Aerial view of New Mexico from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 716 by 800 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

The extremes of New Mexico

Most populous

Bernalillo County

667,601

Least populous

Harding County

617

Largest by land area

Catron County

6,924 sq mi

Smallest by land area

Los Alamos County

109.1 sq mi

Most densely populated

Bernalillo County

575 per sq mi

Highest median household income

Los Alamos County

$147,139

Which is the largest county in New Mexico? The answer depends on whether you mean area or population.

The counties, by shape

Every one, drawn to its own scale so the small ones stay recognisable. Shape alone is not a size comparison; the table below carries the areas.

What the map does not say

The counties of New Mexico are nowhere near the same size. Catron County covers 6,924 sq mi of land, 63.5 times the 109.1 sq mi of Los Alamos County. People are spread even less evenly: Bernalillo County packs 575 per sq mi while Harding County holds 0.29 per sq mi.

They were not drawn in one sitting either. Valencia County dates to 1852, and the boundaries were still being redrawn when Cibola County was organised in 1981, 129 years later. Founding years come from Wikidata and are worth checking against the county's own history before citing.

And 14 of the 33 counties here share their names with counties in other states, so searching by name alone can land in the wrong place; the A to Z index lists every duplicate.

All 33 counties of New Mexico

Sortable on any column. This table doubles as the text alternative to the map above: every area is a link, in alphabetical order, whether or not the map renders.

The 33 counties of New Mexico, with population, land area, density, median household income, county seat and FIPS code.
NamePopulationLand areaDensityMedian incomeSeatFIPS
Bernalillo County667,6011,161 sq mi575 per sq mi$69,473Albuquerque35001
Catron County3,8276,924 sq mi0.55 per sq mi$49,864Reserve35003
Chaves County63,3646,067 sq mi10.4 per sq mi$52,938Roswell35005
Cibola County26,8074,540 sq mi5.9 per sq mi$50,759Grants35006
Colfax County12,1843,758 sq mi3.2 per sq mi$53,554Raton35007
Curry County46,6551,406 sq mi33.2 per sq mi$57,309Clovis35009
De Baca County1,6472,323 sq mi0.71 per sq miNot availableFort Sumner35011
Doña Ana County229,0913,808 sq mi60.2 per sq mi$56,848Las Cruces35013
Eddy County62,5094,176 sq mi15.0 per sq mi$78,426Carlsbad35015
Grant County27,2523,961 sq mi6.9 per sq mi$44,958Silver City35017
Guadalupe County4,3433,030 sq mi1.4 per sq mi$42,750Santa Rosa35019
Harding County6172,125 sq mi0.29 per sq mi$48,553Mosquero35021
Hidalgo County3,9293,439 sq mi1.1 per sq mi$48,882Lordsburg35023
Lea County74,7494,392 sq mi17.0 per sq mi$68,015Lovington35025
Lincoln County19,8444,831 sq mi4.1 per sq mi$53,303Carrizozo35027
Los Alamos County19,407109.1 sq mi178 per sq mi$147,139Los Alamos35028
Luna County25,4072,965 sq mi8.6 per sq mi$36,419Deming35029
McKinley County68,1195,451 sq mi12.5 per sq mi$47,668Gallup35031
Mora County4,0511,926 sq mi2.1 per sq mi$53,663Mora35033
Otero County70,3686,613 sq mi10.6 per sq mi$55,876Alamogordo35035
Quay County8,4542,874 sq mi2.9 per sq mi$41,946Tucumcari35037
Rio Arriba County39,8325,861 sq mi6.8 per sq mi$57,155Tierra Amarilla35039
Roosevelt County18,6152,446 sq mi7.6 per sq mi$52,685Portales35041
San Juan County120,3405,517 sq mi21.8 per sq mi$55,872Aztec35045
San Miguel County26,2604,722 sq mi5.6 per sq mi$49,431Las Vegas35047
Sandoval County159,5653,710 sq mi43.0 per sq mi$86,636Bernalillo35043
Santa Fe County156,9071,910 sq mi82.1 per sq mi$79,071Santa Fe35049
Sierra County11,3954,181 sq mi2.7 per sq mi$41,600Truth or Consequences35051
Socorro County15,8386,646 sq mi2.4 per sq mi$36,570Socorro35053
Taos County34,5642,202 sq mi15.7 per sq mi$58,950Taos35055
Torrance County16,1003,345 sq mi4.8 per sq mi$57,842Estancia35057
Union County3,8443,825 sq mi1.0 per sq mi$46,694Clayton35059
Valencia County82,0131,067 sq mi76.9 per sq mi$58,933Los Lunas35061

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

The ten most populous

  1. Bernalillo County667,601
  2. Doña Ana County229,091
  3. Sandoval County159,565
  4. Santa Fe County156,907
  5. San Juan County120,340
  6. Valencia County82,013
  7. Lea County74,749
  8. Otero County70,368
  9. McKinley County68,119
  10. Chaves County63,364

Data on this page last rebuilt 30 August 2026. How these figures are produced.