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County · code 35047

San Miguel CountyNew Mexico

San Miguel County is in New Mexico and has Las Vegas as its county seat. The county was established in 1846 as one of seven original New Mexico counties under Kearny's Code of Laws, though it was recreated in its present form in 1923.

  • Founded1923
  • County seatLas Vegas
  • Land area4,722 sq mi + 20 sq mi water
  • Population27,201 2020 Census
  • Parcels mapped29,801 checked 16 October 2026
Open the free map Click any parcel in San Miguel County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

MoraGuadalupeHardingSanta FeQuayTorrance Las Vegas Census outline · seat marked

Where it is

San Miguel on the map of New Mexico

New Mexico has 33 counties and county equivalents, each with its own records office. Shapes with a page are links.

Bernalillo CountyCatron CountyChaves CountyCibola CountyColfax CountyCurry CountyDe Baca CountyDoña Ana CountyEddy CountyGrant CountyGuadalupe CountyHarding CountyHidalgo CountyLea CountyLincoln CountyLos Alamos CountyLuna CountyMcKinley CountyMora CountyOtero CountyQuay CountyRio Arriba CountyRoosevelt CountySandoval CountySan Juan CountySanta Fe CountySierra CountySocorro CountyTaos CountyTorrance CountyUnion CountyValencia CountySan Miguel County San Miguel
Counties of New Mexico · San Miguel highlighted

History

Formed in 1923 from Harding County

An old deed may name a county that no longer exists, or a boundary that has since moved.

San Miguel County was formed in 1923 from Harding County. Las Vegas is the county seat.

Deeds and plats from before 1923 for land now in San Miguel County may have been recorded in Harding County.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

  1. 1846
    San Miguel County created San Miguel established as one of seven original New Mexico counties under Kearny's Code of Laws for the occupied Mexican territory. No written definitions given for the counties, boundaries were shown on the "Map of New Mexico Territory made by order of Brig. Gen. S. W. Kearny under instructions from Lieut. W. H. Emory, U.S.T.E. by Lieut's S.W. Abert and W.G. Peck, U.S.T.E. 1846-7." Competing claims to the eastern half of New Mexico resulted in an overlap between San Miguel and Bexar (Texas).
    from S. W.from W. H.from U.s.t.efrom S.w.from W.g.from Bexar (Tex.)
    · Kearny's Code 1846, "Courts and Judicial Powers," secs. 5-7/p. 49; Abel, Map #2; Coan, 252; Williams, 108-109
  2. 1852
    Gained territory San Miguel gained from Santa Fe and Non-County Area 1, and exchanged with Bernalillo and Taos when all counties redefined.
    from Santa Fefrom Bernalillofrom Taos
    · N.M. Terr. Laws 1851, 1st assy., 2d sess. /p. 291
  3. 1864
    Lost territory San Miguel lost to Santa Fe.
    to Santa Fe.
    · N.M. Terr. Laws 1863-1864, 13th assy. /p. 88
  4. 1923
    San Miguel County created Jefferson (now San Miguel) created from Harding, Non-County Area 3, and all of San Miguel; Non-County Area 3 and San Miguel eliminated. Jefferson existed for only one day before being renamed San Miguel. This act and its companion the following day circumvented the constitutional prohibition against changing county boundaries by special or local law.
    from Harding
    · N.M. Laws 1923, 6th reg. sess., ch. 142/pp. 281-283
  5. 1923
    Renamed Jefferson renamed San Miguel. This act and its predecessor circumvented the constitutional prohibition against changing county boundaries by special or local law.
    formerly Jefferson
    · N.M. Laws 1923, 6th reg. sess., ch. 151/p. 331
Show all 16 changes (11 more)
  1. 1846
    San Miguel County created San Miguel established as one of seven original New Mexico counties under Kearny's Code of Laws for the occupied Mexican territory. No written definitions given for the counties, boundaries were shown on the "Map of New Mexico Territory made by order of Brig. Gen. S. W. Kearny under instructions from Lieut. W. H. Emory, U.S.T.E. by Lieut's S.W. Abert and W.G. Peck, U.S.T.E. 1846-7." Competing claims to the eastern half of New Mexico resulted in an overlap between San Miguel and Bexar (Texas).
    from S. W.from W. H.from U.s.t.efrom S.w.from W.g.from Bexar (Tex.)
    · Kearny's Code 1846, "Courts and Judicial Powers," secs. 5-7/p. 49; Abel, Map #2; Coan, 252; Williams, 108-109
  2. 1848
    Changed San Miguel recognized by the General Assembly of the Territory of New Mexico which convened December 1847 prior to formal designation of New Mexico Territory by the United States Congress. · N.M. Terr. Laws 1847, pp. 37-39
  3. 1852
    Gained territory San Miguel gained from Santa Fe and Non-County Area 1, and exchanged with Bernalillo and Taos when all counties redefined.
    from Santa Fefrom Bernalillofrom Taos
    · N.M. Terr. Laws 1851, 1st assy., 2d sess. /p. 291
  4. 1864
    Lost territory San Miguel lost to Santa Fe.
    to Santa Fe.
    · N.M. Terr. Laws 1863-1864, 13th assy. /p. 88
  5. 1869
    Gained territory By 15 January 1869 San Miguel had gained from Bernalillo, Socorro, and Valencia. Though no law has been found authorizing this change, the definition for the creation of Lincoln on 16 January 1869 depends on the San Miguel boundary having been extended southward as mapped.
    from Bernalillofrom Socorrofrom Valenciafrom Lincoln
    · Coan, 259
  6. 1882
    Lost territory San Miguel lost to Mora.
    to Mora
    · N.M. Terr. Laws 1882, 25th assy., ch. 86/pp. 176-177
  7. 1882
    Exchanged territory San Miguel exchanged with Santa Fe.
    with Santa Fe.
    · N.M. Terr. Laws 1882, 25th assy., ch. 83/p. 174
  8. 1889
    Boundary clarified Boundary between San Miguel and Mora redefined (no change).
    with Morano change
    · N.M. Terr. Laws 1888, 28th assy., ch. 37/p. 89
  9. 1889
    Gained territory San Miguel gained from Santa Fe.
    from Santa Fe.
    · N.M. Terr. Laws 1888, 28th assy., ch. 127/pp. 301-302
  10. 1893
    Lost territory San Miguel lost to creation of Guadalupe (original). Act passed 26 February 1891, became effective 1 January 1893.
    to Guadalupe
    · N.M. Terr. Laws 1891, 29th assy., ch. 88/pp. 175-180
  11. 1894
    Lost territory San Miguel lost to creation of Union. Act passed 23 February 1893; took effect 1 January 1894.
    to Union
    · N.M. Terr. Laws 1893, 30th assy., ch. 49/pp. 68-75
  12. 1905
    Lost territory San Miguel lost to creation of Torrance. Act passed 16 March 1903; took effect 1 January 1905.
    to Torrance
    · N.M. Terr. Laws 1903, 35th assy., ch. 70/pp. 132-134
  13. 1905
    Lost territory San Miguel lost to Torrance.
    to Torrance
    · N.M. Terr. Laws 1905, 36th assy., ch. 2/pp. 2-3
  14. 1907
    Lost territory San Miguel lost to Quay.
    to Quay
    · N.M. Terr. Laws 1907, 37th assy., ch. 62/pp. 123-124
  15. 1923
    San Miguel County created Jefferson (now San Miguel) created from Harding, Non-County Area 3, and all of San Miguel; Non-County Area 3 and San Miguel eliminated. Jefferson existed for only one day before being renamed San Miguel. This act and its companion the following day circumvented the constitutional prohibition against changing county boundaries by special or local law.
    from Harding
    · N.M. Laws 1923, 6th reg. sess., ch. 142/pp. 281-283
  16. 1923
    Renamed Jefferson renamed San Miguel. This act and its predecessor circumvented the constitutional prohibition against changing county boundaries by special or local law.
    formerly Jefferson
    · N.M. Laws 1923, 6th reg. sess., ch. 151/p. 331

Land and parcels

What the maps cover in San Miguel

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

San Miguel by the Census

Population
27,201 2020 Census count
Housing units
14,768 2020 Census count
Land area
4,722 square miles
Water area
20 square miles
People per sq mi
6 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Zoning and code

County government

See your own lot on these maps

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Questions

Common questions about San Miguel County

When was San Miguel County founded?
San Miguel County was founded in 1923, formed from Harding County.
What is the county seat of San Miguel County?
The county seat of San Miguel County is Las Vegas.
Is there an online parcel map for San Miguel County?
Yes. A public source publishes a parcel map of 29,801 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has San Miguel County's boundary or name changed?
San Miguel County was created in 1846 from Harding County. Since then the Atlas of Historical County Boundaries records 14 later changes, chiefly involving Santa Fe. County, Bernalillo County and Torrance County. It was formerly called Jefferson.
Is my lot in a flood zone?
We do not have flood maps for San Miguel County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door