When was Sandoval County founded?

Sandoval County was founded in 1903, formed from Bernalillo County, and named after Juan de Dios Sandoval Martínez.

What is the county seat of Sandoval County?

The county seat of Sandoval County is Bernalillo.

Is there an online parcel map for Sandoval County?

Yes. Sandoval County publishes a parcel map of 151,990 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Sandoval County's boundary or name changed?

Sandoval County was created in 1903 from Bernalillo County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Los Alamos County, Rio Arriba County and Santa Fe County.

Is my lot in a flood zone?

We do not have flood maps for Sandoval County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

County · code 35043

Sandoval CountyNew Mexico

Sandoval County is a county in New Mexico with its seat in Bernalillo. The county was created on April 14, 1903, from Bernalillo County.

Founded1903
County seatBernalillo
Named forJuan de Dios Sandoval Martínez
Land area3,710 sq mi + 4.2 sq mi water
Population148,834 2020 Census
Parcels mapped151,990 checked 15 October 2026

Open the free map Click any parcel in Sandoval County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated 19 October 2026

Census outline · seat marked

History

Formed in 1903 from Bernalillo County

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

Sandoval County was named after Juan de Dios Sandoval Martínez. On May 8, 1905, Sandoval was abolished and immediately re-created on the same day with slightly different boundaries; the net result was that Sandoval lost territory to Rio Arriba and Santa Fe. On March 16, 1949, Sandoval lost territory to the creation of Los Alamos, and a small area between Los Alamos and Santa Fe was separated from the rest of the county, leaving Sandoval in two parts.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

1903
Sandoval County created Sandoval created by New Mexico Territory from Bernalillo. Act passed 10 March 1903; took effect 14 April 1903.
from Bernalillo
14 April 1903 · N.M. Terr. Laws 1903, 35th assy., ch. 27/pp. 37-43
1905
Eliminated Sandoval was abolished, then immediately re-created on the same day with slightly different boundaries. Net result was Sandoval lost to Rio Arriba and Santa Fe. Act passed 20 February 1905; took effect 8 May 1905.
into Rio Arriba into Santa Fe.
8 May 1905 · N.M. Terr. Laws 1905, 36th assy., ch. 10/pp. 34-39
1949
Lost territory Sandoval lost to creation of Los Alamos. A small area of Sandoval, between Los Alamos and Santa Fe, was separated from the rest of the county, and Sandoval remained in two parts as of 2000.
to Los Alamos to Santa Fe
16 March 1949 · N.M. Laws 1949, 19th reg. sess., ch. 134/pp. 319-321

Land and parcels

What the maps cover in Sandoval

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

Parcels Good enough

Lot lines and tax-map numbers for 151,990 parcels from Sandoval County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 5 March 2026 · checked 15 October 2026
Address points Missing

No public address points layer found for Sandoval County yet.
Buildings Reference

Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026

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

Sandoval by the Census

Population

148,834 2020 Census count

Housing units

58,603 2020 Census count

Land area

3,710 square miles

Water area

4.2 square miles

People per sq mi

40 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

Sandoval County's official site

We have found the county's site but not its offices yet; start there.

County government

County government
The official website of Sandoval County.
sandovalcounty.com

See your own lot on these maps

Open Sandoval County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

Open the free map no sign-in Pro early access

Questions

Common questions about Sandoval County

When was Sandoval County founded?: Sandoval County was founded in 1903, formed from Bernalillo County, and named after Juan de Dios Sandoval Martínez.
What is the county seat of Sandoval County?: The county seat of Sandoval County is Bernalillo.
Is there an online parcel map for Sandoval County?: Yes. Sandoval County publishes a parcel map of 151,990 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Sandoval County's boundary or name changed?: Sandoval County was created in 1903 from Bernalillo County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Los Alamos County, Rio Arriba County and Santa Fe County.
Is my lot in a flood zone?: We do not have flood maps for Sandoval County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby