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Idaho County
Fremont County, Idaho
Island Park and the St. Anthony Sand Dunes - from Island Park's world-class fly fishing (Island Park Reservoir and the Henry's Fork of the Snake River - one of the most celebrated dry fly fishing streams in the world - flows through Fremont County on its way from Yellowstone's caldera to the Snake River Plain, and the Henry's Fork Lodge and the Railroad Ranch stretch are legendary among fly fishing enthusiasts worldwide) to the St. Anthony Sand Dunes (the 10,500-acre active sand dune field near St. Anthony - one of the largest in the Pacific Northwest - whose brilliant white quartz sand dunes rising 400 feet attract ATV riders and sandboarders to one of Idaho's most unusual landscapes).
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Office: Fremont County Sheriff’s Office – 146 N. 2nd West Street, St. Anthony, ID 83445 | (208) 624-4482; Sheriff elected 2024.
Notes: For an active emergency, call 911. A genuinely distinctive local unit: the Fremont County Sheriff’s Office runs a dedicated summer “Sand Patrol” of deputies who patrol the St. Anthony Sand Dunes by ATV, maintaining a rescue-equipment station at the BLM Sand Dunes Campground; the department has credited increased patrol presence there with a substantial reduction in dune-related fatalities over the years.
Roads & Utilities
ROADS & TRANSPORTATION
Roads: US-20 serves St. Anthony, the county seat and largest city, on the Henry’s Fork of the Snake River.
Notes: Fremont County is home to the St. Anthony Sand Dunes, a striking white quartz dune field covering nearly 10,000 acres and reaching heights up to 400 feet. According to the Bureau of Land Management, the dunes formed roughly 10,000 years ago as the Ice Age ended: as Mud Lake and Market Lake shrank in a warming climate, winds carried sand from those lakebeds and the Snake River eastward, a process that continues adding sand to the dunes today. The area once supported now-extinct megafauna including one-humped camels, mammoths, and giant bison.
Business & Permits
BUILDING & PERMITS
Office: Fremont County Courthouse – 151 W. 1st Street N., St. Anthony, ID (built 1909, Classical Revival, architects Wayland & Fennell; National Register of Historic Places since 1979).
Notes: The dunes also serve as habitat for one of the largest wintering elk populations in the United States, and the area is open to motorized recreation in warmer months but closed in winter to protect wildlife. Nearby, the Egin Bench Petroglyphs – ancient rock carvings etched into basalt formations by Indigenous peoples thousands of years ago – remain a notable archaeological site four miles outside St. Anthony.
Veterans Services
VETERANS SERVICES
Office: Fremont County Veterans Services – confirm current contact via fremontcountyid.gov.
Libraries
LIBRARIES
St. Anthony Public Library (St. Anthony) – confirm current address/phone via the county library system.
Parks & Recreation
PARKS & RECREATION
Key Assets: The St. Anthony Sand Dunes (off-roading, sandboarding, camping under dark night skies with occasional Northern Lights visibility), the Egin Bench Petroglyphs, Henry’s Fork fly fishing, and the Fremont County Courthouse (National Register of Historic Places) are the county’s premier heritage and recreational attractions.
Notes: The genuine, distinctive “Sand Patrol” unit and the striking, scientifically documented formation of the St. Anthony Sand Dunes are among the standout local facts covered in this project.
GIS & Maps
GIS & MAPS
Appraisal/Parcel Search: Fremont County Assessor’s Office – confirm current contact via fremontcountyid.gov.
Animal Services
ANIMAL SERVICES
Confirm current dedicated shelter contact via fremontcountyid.gov; Fremont County Sheriff’s Office for animal control arrangements.
Environmental & Waste
ENVIRONMENTAL / WASTE MANAGEMENT
Office: Fremont County Solid Waste / Planning & Zoning – confirm current contact via fremontcountyid.gov.
NOTES: Fremont County is the twenty-second county completed in Idaho’s Round 3 v2 redo, under the A+ sourced standard established for this project. The genuine, distinctive “Sand Patrol” unit and the striking formation of the St. Anthony Sand Dunes are among the standout local facts covered in this project. 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 Fremont County
Fremont County is the Henry’s Fork and Island Park – the Henry’s Fork of the Snake River is one of the world’s most celebrated dry fly fishing streams, and the St. Anthony Sand Dunes’ 400-foot white quartz dunes make Fremont County one of Idaho’s most scenically diverse communities at Yellowstone’s western gateway.
St. Anthony (the county seat, population ~3,500) serves the county’s agricultural and recreation communities. Island Park’s resort economy drives significant tourism near the Yellowstone border.
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Fremont County Assessor at 151 W. 1st N., Suite 14, St. Anthony, ID 83445, phone 208-624-7441. ID homeowner’s exemption up to $125,000.
Courts & Legal
Fremont County District Court at 151 W. 1st N., St. Anthony, ID 83445, phone 208-624-7332, handles probate.
Marriage & Vital Records
Marriage licenses, divorce records, and birth & death certificates are handled by the following office(s):
COUNTY CLERK / ADMINISTRATOR
151 W. 1st N., St. Anthony, ID 83445
(208) 624-4471
CLERK OF COURT (Records, Marriage Licenses)
151 W. 1st N., St. Anthony, ID 83445
(208) 624-4471
ELECTIONS / CLERK
151 W. 1st N., St. Anthony, ID 83445
(208) 624-4471
Genealogy
County-level record sources
Fremont County Magistrate Court (probate/estate case files – see Probate section above).
Local societies
No dedicated Fremont 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
Fremont County Magistrate Court 151 West 1st North, Room 12, St. Anthony, ID 83445 (208) 624-7401 Fremont County is in eastern Idaho, near Yellowstone National Park and the Sand Dunes area.
Step 1: figure out which path applies
Idaho has adopted the Uniform Probate Code (Idaho Code Title 15). Idaho is also a community property state. Idaho recognizes four main paths:
Small Estate Affidavit – a non-court process for estates with a total value of $100,000 or less (excluding liens and encumbrances) and no real property. Available 30 days after death. No court filing required (Idaho Code § 15-3-1201).
Summary Administration – available when the value of all the decedent’s property is less than the homestead allowance, exempt property, and last-illness medical expenses combined, or when a surviving spouse is sole beneficiary (Idaho Code §§ 15-3-1203, 15-3-1205).
Informal Probate – the most common track for uncontested estates, handled through the court registrar.
Formal Probate – court-supervised proceedings required when disputes arise or the will is contested.
Step 2: filing
For informal probate with a will, file an Application for Informal Probate of Will and Appointment of Personal Representative with the Magistrate Division.
For formal probate, file a Petition for Probate of Will and Appointment of Personal Representative (or the equivalent for intestate estates).
Idaho does not have a statutory fee schedule for attorneys or personal representatives – fees must be reasonable given the services rendered and complexity.
If formal or informal probate is needed
Determine whether small estate affidavit, summary administration, or full probate applies.
File the appropriate application or petition with the Fremont County Magistrate Court.
Under informal proceedings, the registrar reviews the application without a hearing. Under formal proceedings, a judge holds a hearing.
The personal representative accepts the appointment and may need to post a bond.
Once appointed, the court issues Letters Testamentary or Letters of Administration. Obtain several certified copies.
Publish notice to creditors as required.
Mail notice to all heirs, beneficiaries, and interested parties.
Marshal assets, obtain an EIN, open an estate account, pay valid debts and expenses, and prepare any required inventory.
Distribute remaining assets per the will or Idaho’s intestacy statutes, then close the estate.
What it costs
Idaho does not impose its own state estate or inheritance tax.
Idaho does not have a statutory fee schedule for attorneys or personal representatives.
Court filing fees and publication costs are separate – confirm current amounts with the Fremont County Magistrate Court.
Probate in Idaho typically takes 6-12 months for uncontested 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
151 W. 1st N., St. Anthony, ID 83445
(208) 624-4482
Elections & Voting
Voter registration, polling locations, and elections information are handled by the following office(s):
ELECTIONS / CLERK
151 W. 1st N., St. Anthony, ID 83445
(208) 624-4471
Health & Human Services
Offices & Contacts
Health services, social services, and assistance programs are handled by the following office(s):
Idaho Dept of Health & Welfare — East
(208) 528-5700
Idaho Medicaid
(800) 926-2588
Madison Memorial Hospital
madisonmemorial.org (Rexburg — adjacent Madison County)
Public Health Information
PUBLIC HEALTH
Office: Eastern Idaho Public Health (serving Fremont County) – confirm current contact via eiph.idaho.gov.
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Last verified June 2026
County Facts
County Seat: St. Anthony
Population: 13,500
Area: 1,867 sq mi
Established: 1893
Tier: 3
Public Records
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