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New Mexico · Four Corners · #490 Most Populous County in the US
San Juan County, New Mexico
The Four Corners energy county at the junction of New Mexico, Colorado, Arizona, and Utah - from Farmington's natural gas and oil heritage to the Navajo Nation's vast lands bordering the county, Aztec Ruins National Monument, the Animas and San Juan rivers' confluence, and an economy in profound transition as coal and natural gas production shift toward clean energy. Property tax, courts, public records, and senior services for San Juan County residents.
Affiliate disclosure: This page contains affiliate links. We may earn a commission if you use them, at no extra cost to you. Our editorial recommendations are independent of these relationships.
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Tell us your goal and we'll guide you step-by-step to the right office, forms, and official resources.
San Juan County's assessment ratio means effective tax rates are low — but incorrect appraisals still cost money. Ownwell manages the appeal with no upfront cost.
Office: San Juan County Office of Emergency Management – 209 S. Oliver Dr, Aztec, NM 87410 | (505) 334-7700.
Sheriff: San Juan County Sheriff’s Office – 211 S. Oliver Drive, Aztec, NM 87410 | (505) 334-6107 (all locations); Non-emergency dispatch: (505) 334-6622. Substations at Lee Acres (Farmington) and Kirtland. Covers roughly 2,000 square miles and 127,000 residents in unincorporated/non-reservation areas; 105 certified deputies handling ~55,000 calls/year.
City police: Farmington Police Department, Aztec Police Department (201 W. Chaco, Aztec, NM 87410, non-emergency (505) 334-6622, admin (505) 334-7601).
Notes: For an active emergency, call 911.
Roads & Utilities
ROADS & TRANSPORTATION
Roads: US-64 and US-550 serve Aztec, the county seat, while Farmington is the county’s largest city and hub of the Four Corners region.
Notes: San Juan County, created 1887, is named for the San Juan River. It’s New Mexico’s fifth-most populous county and includes the state’s portion of the Four Corners – the only place in the U.S. where four states meet. Farmington sits at the confluence of the San Juan, Animas, and La Plata Rivers.
Business & Permits
BUILDING & PERMITS
Office: San Juan County Administration Building – Aztec, NM 87410; confirm current phone via sjcounty.net.
Notes: San Juan County is genuinely home to Aztec Ruins National Monument – one of the finest preserved Ancestral Puebloan heritage sites in the Southwest, featuring the Great Kiva, one of the largest and most completely reconstructed kivas in the world. Chaco Culture National Historical Park is also accessible from the county. The San Juan River below Navajo Dam is genuinely renowned as one of the finest trophy trout tailwater fisheries in the United States. Shiprock, a dramatic volcanic rock formation sacred to the Navajo Nation, rises from the desert landscape in the county’s western reaches.
Veterans Services
VETERANS SERVICES
Office: San Juan County Veterans Service – confirm current contact via sjcounty.net.
Federal: Albuquerque VA Medical Center (long distance).
Libraries
LIBRARIES
Farmington Public Library – 2101 Farmington Ave, Farmington, NM 87401; genuinely founded in 1921 in the living room of first librarian Mrs. Lorena Mahany’s home, later housed in a 1938 WPA-built building and a former bank building before the current $9.77 million facility opened in 2002; over 203,000-item collection.
Parks & Recreation
PARKS & RECREATION
Key Assets: Aztec Ruins National Monument, Chaco Culture National Historical Park, Shiprock, and the San Juan River’s world-class trout fishing below Navajo Lake are the county’s premier attractions.
Notes: The genuine Aztec Ruins/Chaco Culture Ancestral Puebloan heritage and the county’s position at the Four Corners are distinctive local facts.
GIS & Maps
GIS & MAPS
Appraisal/Parcel Search: San Juan County Assessor – confirm current contact via sjcounty.net.
Animal Services
ANIMAL SERVICES
Farmington Regional Animal Shelter – run by the City of Farmington, contracted with San Juan County to serve the entire county (also Bloomfield, Kirtland); open-admission; roughly 140 dog and 100 cat capacity, plus livestock holding; animal control enforcement itself is handled separately by Farmington Police Department (in-city) and the San Juan County Sheriff’s Office (county).
San Juan Animal League (nonprofit) – [email protected]; offers low-cost vaccinations and spay/neuter clinics.
Environmental & Waste
ENVIRONMENTAL / WASTE MANAGEMENT
Office: San Juan County – confirm current contact via sjcounty.net.
NOTES: San Juan County is the third county in the New Mexico v3 A+ sourced redo’s fourth batch (Rio Arriba, Roosevelt, San Juan, San Miguel, Sandoval, Santa Fe, Sierra). The genuine Aztec Ruins/Chaco Culture Ancestral Puebloan heritage and the county’s position at the Four Corners are distinctive local facts. All contact information above was sourced via web search as of early August 2026 and should be reconfirmed directly with the relevant office before a visit, deadline-sensitive filing, or emergency-adjacent decision.
About San Juan County
San Juan County is New Mexico’s fourth most populous county and the 490th most populous in the United States, covering 5,516 square miles of the Colorado Plateau’s Four Corners region.
Farmington (the county seat and largest city, population ~44,000) is the commercial hub of the Four Corners region – serving not only San Juan County but also portions of the Navajo Nation, the adjacent Colorado and Utah communities, and the broader Four Corners area. Farmington’s economy has historically centered on natural gas and coal-bed methane production from the San Juan Basin – one of the most productive natural gas basins in the United States. Energy industry contraction since the mid-2010s has driven significant economic adjustment.
Aztec (the county seat, population ~7,000) hosts the Aztec Ruins National Monument – a remarkably preserved Great House pueblo built by Ancestral Puebloan people around 1100 CE, featuring the only fully reconstructed great kiva in the United States. The “Aztec” name is a misnomer – early American settlers incorrectly attributed the ruins to Aztec builders rather than recognizing the Ancestral Puebloan (Anasazi) origin.
The Navajo Nation – the largest Native American nation in the United States by land area (approximately 17.5 million acres across New Mexico, Arizona, and Utah) – borders San Juan County on the south and west. The county’s population includes significant Navajo communities, and the Navajo Nation government in Window Rock, Arizona exercises significant influence over regional affairs.
The Animas River (flowing through Farmington from Durango, Colorado) and the San Juan River (flowing west through the county toward Lake Powell) provide significant recreational resources and are central to the region’s water rights and agricultural economy.
All Services
Browse every category and topic available for this county.
New Mexico assesses at 33.33% of market value with a 3% annual cap. The San Juan County Assessor at 100 S. Oliver Drive, Aztec, NM 87410, phone 505-334-6157, determines values. Protest within 30 days of Notice of Value. If dissatisfied, appeal to the County Valuation Protests Board. No NM estate or inheritance tax.
OWNWELL CTA: San Juan County Assessor protest: within 30 days of Notice of Value. Energy sector transition affecting Farmington market – careful assessment review warranted. No NM estate or inheritance tax. Ownwell manages the appeal with no upfront cost.
Recommended
San Juan County Assessor protest: within 30 days of Notice of Value. Energy sector transition affecting Farmington market - careful assessment review warranted. No NM estate or inheritance tax. Ownwell manages the appeal with no upfront cost.
Courts & Legal
Courts & Legal
District Court (Probate): The San Juan County District Court – 11th Judicial District at 103 S. Oliver Drive, Aztec, NM 87410, phone 505-334-6151, handles probate, estate administration, and all civil and criminal matters.
County Clerk: The San Juan County Clerk at 100 S. Oliver Drive, Aztec, phone 505-334-9471, maintains real property records. Land records searchable online.
Senior Services
The San Juan County Senior Services at 100 N. Auburn Avenue, Farmington, NM 87401, phone 505-566-3303, serves the county’s senior population with in-home services, caregiver support, nutrition programs, and transportation. San Juan Regional Medical Center in Farmington provides significant geriatric care.
Recommended
Assisted living, memory care, and independent living across San Juan County - from Farmington and Aztec to Bloomfield, Flora Vista, and the Four Corners communities.
Marriage & Vital Records
Marriage licenses, divorce records, and birth & death certificates are handled by the following office(s):
COUNTY CLERK
100 S. Oliver Dr., Aztec, NM 87410
(505) 334-9471
COUNTY CLERK — ELECTIONS
100 S. Oliver Dr., Aztec, NM 87410
(505) 334-9471
Genealogy
PRIMARY STATEWIDE RESEARCH CENTERS (same across all New Mexico counties)
New Mexico State Records Center and Archives, 1205 Camino Carlos Rey, Santa Fe, NM 87507.
New Mexico Genealogical Society, P.O. Box 8283, Albuquerque, NM 87198.
County-level record sources
San Juan County Probate Court, Aztec (probate case files – see Probate section above).
Local societies
No dedicated San Juan County genealogical society was confirmed in available directories.
Probate & Estate
Losing someone and having to deal with courts and paperwork at the same time is hard. This section won’t make that easier, but it should tell you what to expect, what it costs, and where to go – so at least you’re not walking in blind.
Where to go
San Juan County Probate Court 100 South Oliver Drive, Suite 100, Aztec, NM 87410 (505) 334-9471
San Juan County is in New Mexico’s northwestern corner, seated in Aztec (though Farmington is the county’s largest city).
Step 1: figure out which path applies
New Mexico adopted the Uniform Probate Code. New Mexico has a dual court system: the county PROBATE COURT handles informal, uncontested probate matters with minimal court involvement, and has concurrent jurisdiction with the DISTRICT COURT over informal proceedings. The District Court alone handles formal probate – contested cases, determinations of heirship, and trust matters.
Small Estate Affidavit / Affidavit of Successor in Interest (N.M. Stat. § 45-3-1201) – available when the value of the entire estate (after liens and encumbrances) does not exceed $50,000 and does NOT include any real property. At least 30 days must have passed since death. This skips probate court entirely – the affidavit is presented directly to banks, the DMV, or other institutions holding the property.
Homestead Transfer Affidavit for Surviving Spouse (N.M. Stat. § 45-3-1205) – available 6 months after death, when the surviving spouse and decedent owned a homestead as community property valued at $500,000 or less (for property tax purposes). The affidavit is recorded with the county clerk and can avoid formal probate for the residence, but only if funeral expenses, expenses of last illness, and all unsecured debts have already been paid.
Informal Probate – the most common path for uncontested estates, filed with either the Probate Court or the District Court in the county where the decedent was domiciled. No hearing required.
Formal Probate – required for contested cases, disputes over heirship, or trust matters. Only the District Court can hear these.
Step 2: filing for informal or formal probate
File a petition with the Probate Court or District Court in the county where the decedent was domiciled. A probate may be started up to 3 years after death.
The court appoints the personal representative and issues Letters Testamentary or Letters of Administration.
The personal representative notifies creditors; New Mexico’s creditor claim period is 2 months from notice to creditors – one of the shortest in the country.
The personal representative inventories the estate’s assets, pays debts and expenses, and distributes the remaining assets according to the will or New Mexico’s intestacy statute.
The estate is closed, typically within 6 to 12 months for straightforward, uncontested cases.
What it costs
The filing fee for probate in Probate Court is generally around $30 – notably lower than in most states. District Court filing fees run higher, commonly $100–$232 depending on the county and complexity.
New Mexico does not set a fixed statutory percentage for personal representative compensation; courts typically look to a reasonable guideline of about 2–4% of the estate’s value.
New Mexico has no state estate tax and no state inheritance tax. Only the federal estate tax could apply, and only to very large estates.
Probate filings, estate administration, and guardianship matters are handled by the following office(s):
Public Safety & Arrests
Arrest records, inmate search, and law enforcement services are handled by the following office(s):
SHERIFF
100 S. Oliver Dr., Aztec, NM 87410
(505) 334-6312
Elections & Voting
Voter registration, polling locations, and elections information are handled by the following office(s):
COUNTY CLERK — ELECTIONS
100 S. Oliver Dr., Aztec, NM 87410
(505) 334-9471
ELECTIONS
100 S. Oliver Dr., Aztec, NM 87410
(505) 334-9471
Health & Human Services
Offices & Contacts
Health services, social services, and assistance programs are handled by the following office(s):
NM HSD — San Juan
(505) 564-3600
San Juan Regional Medical Center
sanjuanregional.com (Farmington — quality regional hospital; major Four Corners anchor; Level II Trauma)
Public Health Information
PUBLIC HEALTH
Office: San Juan County Public Health – confirm current contact via sjcounty.net.
Hospital: San Juan Regional Medical Center – 801 W Maple St, Farmington, NM; genuinely serves the entire Four Corners region (NM, AZ, UT, CO); 198-bed, Level III Trauma Center, opened 1910.
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