Blog · September 24, 2026 · New Mexico
San Juan County, New Mexico GIS Parcel Map Guide
Farmington, Aztec, Bloomfield, Kirtland, Flora Vista, La Plata and Navajo Dam are all covered by the San Juan County Assessor’s free public parcel map.
Main page: San Juan County, NM GIS & Parcel Viewer (official map link, San Juan County facts and neighboring maps).
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San Juan County sits in the Four Corners, where three rivers meet and the Navajo Nation covers much of the land. The Assessor’s public parcel map includes imagery going back almost fifty years.
The Assessor’s public parcel map
The map, built with Web AppBuilder, opens with a warning that it is a visual aid only and does not depict actual property lines. Its layer list is a history lesson: aerial imagery from 1976, 1996, 1998, 2003, 2005–2006, 2007, 2009, 2011, 2013, 2015, 2017, 2019, 2021, 2023 and 2025. Flipping through them shows farms becoming subdivisions and river channels shifting. A link opens the county GeoHub for downloads.
Find it at San Juan in our New Mexico directory or on the map of U.S. counties.
How to find property lines in San Juan County
The County Clerk in Aztec records deeds, plats and surveys. Most rural land follows section, township and range, but irrigated farms along the rivers can have long, narrow lots running back from the water, and some descriptions refer to ditches and old fences. On the reservation side, land records are handled through federal and tribal offices instead. A New Mexico licensed professional surveyor should locate corners before building or fencing, and a title company can confirm whether minerals were reserved.
The Navajo Nation and allotments
The Navajo Nation covers much of the western and southern county, including Shiprock. Land there is held in trust and not bought or sold like private land. East of the reservation, a checkerboard of allotments, federal, state and private land complicates ownership.
Where three rivers meet
The San Juan, Animas and La Plata rivers come together near Farmington, making the valley an oasis in high desert. Community ditches, some dating to the 1800s, carry water to fields, orchards and pastures, and ditch associations assess members for maintenance. If a parcel has irrigation rights, ask which ditch serves it and whether the shares transfer. In August 2015, a spill at the Gold King Mine in Colorado released acidic mine water that turned the Animas a vivid orange through Aztec and Farmington, and irrigation headgates were closed for days.
Energy country
The San Juan Basin is one of the country’s major natural gas fields, with wells, compressor stations and pipelines spread across the county. Coal fed the San Juan Generating Station near Waterflow until it shut down in 2022, and the nearby mine closed too. Oil and gas activity affects many rural parcels, and mineral rights are frequently owned by someone other than the surface owner, including the federal government. A title search should tell you what was reserved.
Farmington, Aztec and Bloomfield
Farmington is the county’s largest city and a regional shopping center for the Four Corners, drawing shoppers from the reservation and southern Colorado. Aztec, the county seat, sits along the Animas with an old downtown and Aztec Ruins National Monument, a large ancestral Pueblo great house. Bloomfield, near the San Juan, grew with oil refining and gas processing. Kirtland and Fruitland lie west along the river, and Flora Vista and La Plata sit north of Farmington in orchard country.
Each city handles its own zoning and building permits, while the county covers unincorporated areas. City limits appear on the map, and a quick check tells you whose rules apply. Some lots just outside city limits rely on wells and septic even when city lines run nearby.
Why the old imagery matters
The deep imagery archive is not just a novelty. Comparing 1976 or 1996 photos with recent ones can show where a river channel moved, when an arroyo was filled, or whether a structure existed before a certain year. That can matter for flood questions, old easement disputes or whether a building predates zoning rules. For buyers of irrigated land, the older photos show how long a field has been farmed and where ditches ran.
Use the layer list to toggle two years on and off at the same spot. Differences jump out quickly, especially along the Animas and San Juan, where floods and gravel mining reshaped banks.
Navajo Lake and the east
Navajo Dam in the east holds back Navajo Lake, a large reservoir shared with Colorado. Below the dam, the San Juan River is a famous trout fishery. Land around the lake includes state park and federal land, with limited private lots. Rural eastern parcels may lack power, water and paved roads, so check access and utilities before buying.
Property taxes in New Mexico
New Mexico limits annual increases in the taxable value of a residence to 3 percent, unless the home sells or changes. A new buyer’s value may jump to market value, so the seller’s bill may understate yours. Heads of household can claim a small exemption, and veterans can claim another. The Assessor in Aztec handles these filings.
Is the San Juan County GIS map accurate?
The Assessor’s own warning is blunt: the map does not show real boundary lines and a survey is recommended. Checkerboard ownership, old land grant descriptions and shifting river channels make that advice especially important here. Use the map to orient yourself and flip through the imagery, then hire a New Mexico surveyor. Our article on checking land ownership online covers other free sources.
Nearby guides
North, see our La Plata County guide. The New Mexico hub lists all counties.
Frequently asked questions
How far back does San Juan County NM imagery go?
To 1976.
Can I buy land on the Navajo Nation?
No. Reservation land is held in trust.
Who records deeds in San Juan County NM?
The County Clerk.
What rivers meet near Farmington?
The San Juan, Animas and La Plata.
Open the official San Juan County GIS viewer San Juan County in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey — especially for fences, setbacks, or boundary disputes.