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Population of Counties in New Mexico (2024)

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2024 Population
Growth Since 2020
Area (mi²)
Density (/mi²)
Bernalillo County670,215-0.98%448577Bernalillo County location
Doña Ana County226,8903.1%1.5K60Doña Ana County location
Sandoval County158,2756.02%1.4K43Sandoval County location
Santa Fe County156,1510.71%73782Santa Fe County location
San Juan County120,781-0.49%2.1K22San Juan County location
Valencia County80,0814.85%41275Valencia County location
Lea County71,859-3.73%1.7K16Lea County location
Otero County69,1531.9%2.6K10Otero County location
McKinley County67,663-6.79%2.1K12McKinley County location
Chaves County63,230-2.95%2.3K10Chaves County location
Eddy County60,347-3.19%1.6K14Eddy County location
Curry County47,014-2.8%54333Curry County location
Rio Arriba County39,761-1.27%2.3K7Rio Arriba County location
Taos County34,220-0.71%85016Taos County location
Grant County27,251-3.38%1.5K7Grant County location
Cibola County26,689-1.52%1.8K6Cibola County location
San Miguel County26,434-2.57%1.8K6San Miguel County location
Luna County24,939-2.04%1.1K8Luna County location
Lincoln County19,715-2.92%1.9K4Lincoln County location
Los Alamos County19,6151.01%42180Los Alamos County location
Roosevelt County18,716-2.26%9448Roosevelt County location
Torrance County15,8835.45%1.3K5Torrance County location
Socorro County15,815-4.45%2.6K2Socorro County location
Colfax County12,238-0.92%1.5K3Colfax County location
Sierra County11,502-0.52%1.6K3Sierra County location
Quay County8,491-2.54%1.1K3Quay County location
Guadalupe County4,268-3.85%1.2K1Guadalupe County location
Mora County4,099-2.2%7432Mora County location
Union County3,946-3.07%1.5K1Union County location
Hidalgo County3,919-5.88%1.3K1Hidalgo County location
Catron County3,8576.96%2.7K1Catron County location
De Baca County1,622-3.51%8971De Baca County location
Harding County627-3.98%8200.30Harding County location
showing: 33 rows

There are 33 counties in New Mexico. The most populous county in New Mexico is Bernalillo County, which has 678,701 residents. Bernalillo County is home to Albuquerque, the most populous city in the state and the state’s primary economic and business hub. The second-most populous county in New Mexico is Doña Ana County, which has 217,522 people, followed by Santa Fe County, which is home to the state capital of Santa Fe and has a population of 150,056. All three counties have grown since the 2010 Census, by 2.22%, 3.53%, 3.82% respectively.

New Mexico Counties with the Fewest Residents

Of New Mexico’s 33 counties, Harding County has the fewest residents with just 655. This results in a population density of 0.31 persons per square kilometer. About 0.03% of New Mexico’s total population lives in Harding County. De Baca County has the second smallest population of 1,781 people, about 0.08% of the total population. The population density in De Baca County is still less than one person per square kilometer at 0.77 persons. Catron County is the third-least populous county in New Mexico, with a population of 3,578 people. Catron County’s population comprises 0.17% of the state’s total population and its density is 0.52 persons per square kilometer.

New Mexico Counties with Rapid Growth

None of New Mexico’s counties have experienced double-digit growth since 2010. The county that has experienced the highest population growth is Sandoval County, which grew by 9.63%. This is followed by Lea County (7.76%) and Eddy County (7.42%).

The majority of New Mexico counties have experienced population loss since the 2010 Census. Hidalgo County has experienced the greatest population loss of 12.83%, followed by De Baca County (12.22%) and Colfax County (11.82%).

Lists of Counties in all States

  1. New Mexico State Data Center
  2. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  3. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  4. American Community Survey (2009 - 2013)
  5. Census QuickFacts
  6. Historical Populations of States and Counties (1790 - 1990)