Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest counts are the ones each agency reported to the FBI, as the FBI held them on October 8, 2026. The jail figures are from the Vera Institute of Justice's Incarceration Trends data. Every office link was opened and checked against the office's own site between September 24, 2026 and October 9, 2026.
Riverton, Wyoming, in Fremont County, has about 11,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Riverton is held at the county jail, run by the Fremont County Sheriff's Office, and the jail's record of each person held is a public record. This guide says where to look for someone in custody, what the jail holds and who books people into it.
This guide covers the search, the jail, who books people, state prison and common questions.
Related guides: Riverton public records, Fremont County inmate search, Riverton arrest records, Riverton warrants, Riverton criminal records, Riverton court records, Wyoming arrest records and Wyoming inmate search.
Finding Someone in Custody in Riverton
A person kept in custody after an arrest in Riverton is held at the county jail, run by the Fremont County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Fremont County Sheriff's Office at fremontcountywy.gov/government/locations.php (page title: Sheriff's Office Locations), phone (307) 332-5611, 460 Railroad St., Lander, WY 82520, which answered when SearchSystems opened it on October 9, 2026.
That page is the office's jail information page rather than a roster, so a search for a particular person goes through the office at (307) 332-5611.
The Fremont County Jail by the Numbers
On an average day in 2023 the jail held about 160 people, down from about 170 in 2019. Its rated capacity in 2023 was 188 beds, and it ran at 87 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Fremont County has about 40,000 residents (2024 Census Bureau estimate), so the jail holds about 41 people for every 10,000 residents.
Who Books People Into the Fremont County Jail
The Fremont County Sheriff's Office and the agency that reports for Riverton (filed by the FBI as Riverton Police Department) make the arrests that end in a booking in and around Riverton.
The largest arrest counts reported to the FBI were Riverton's 1,282 for 2025, Lander's 605 for 2020 and the Fremont County Sheriff's Office's 379 for 2020.
Together, the two agencies in Fremont County with all twelve months of 2025 on file reported 1,283 arrests to the FBI that year. Those kept in custody were booked into the county jail; a person cited and released at the scene was not.
The counts, agency by agency and year by year, are in Riverton arrest records.
From the Jail to State Prison
A sentence of more than a year is served in state prison, not the jail; the Wyoming Department of Corrections lists its inmates at wdoc-loc.wyo.gov.
Frequently Asked Questions
How do I find an inmate in Riverton?
Ask the Fremont County Sheriff's Office at (307) 332-5611; its jail page SearchSystems verified is at fremontcountywy.gov/government/locations.php.
How many people are in the Fremont County jail?
About 160 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 188 beds.
What is the phone number for the Fremont County jail?
(307) 332-5611, the number on the page of the Fremont County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Fremont County go?
To a facility of the Wyoming Department of Corrections; its inmate locator is at wdoc-loc.wyo.gov.
Is this the official Riverton website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official city, county, court and state offices described above and does not hold records, charge for them or take requests.