County Maps US

San Miguel County, New Mexico

A county in New Mexico, ranked 17 of 33 by population.

CountyFIPS 35047

Within New Mexico
San Miguel County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Las Vegas, the county seat, located via the 2025 Census Gazetteer.

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Population
26,260
-874 (-3.2%) since 2020
Land area
4,722
square miles. A further 0.4% of the total area is water
Population density
5.6
people per square mile, computed rather than published
County seat
Las Vegas
Seat of county government.
Established
1852
173 years ago
Largest city
Las Vegas city
Population 12,574.

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; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of San Miguel County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of San Miguel County, 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 800 by 435 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.

Where San Miguel County ranks

Position among the 33 counties of New Mexico, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn New MexicoNationally
Population26,26017th of 331,570th of 3,144
Land area4,722 sq mi9th of 3392nd of 3,144
Population density5.6 per sq mi20th of 332,744th of 3,144
Median household income$49,43122nd of 322,801st of 3,143

Full data for San Miguel County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population26,260Vintage 2025 Population Estimates
Population in 202027,134Vintage 2025 Population Estimates
2020 estimates base?27,205Vintage 2025 Population Estimates
Land area4,722 sq mi2025 Gazetteer Files
Water area19.8 sq mi2025 Gazetteer Files
Total area4,741 sq mi2025 Gazetteer Files
Population density?5.6 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$49,431American Community Survey 2020-2024 5-Year Estimates
Median home value$188,500American Community Survey 2020-2024 5-Year Estimates
Median age47.2American Community Survey 2020-2024 5-Year Estimates
Households11,931American Community Survey 2020-2024 5-Year Estimates
Housing units14,867American Community Survey 2020-2024 5-Year Estimates

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. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-127
188 births, 315 deaths
Net migration
-48
More people moved out than moved in.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering San Miguel County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Mora CountyNew Mexico85 mi4,051
Guadalupe CountyNew Mexico83 mi4,343
Harding CountyNew Mexico59 mi617
Santa Fe CountyNew Mexico57 mi156,907
Quay CountyNew Mexico42 mi8,454
Torrance CountyNew Mexico24 mi16,100

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 33 counties of New Mexico

Open the interactive New Mexico county map, or jump straight to any of them.

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