Petroleum County Sheriff's Department
Petroleum County Sheriff – Bill Cassell
P: (406) 429-6551
Petroleum County Deputy Sheriff – Travis (T.J.) Clark
P: (406) 429-6551
Registered Sex/Violent Offenders: We currently have none registered in Petroleum County.
Concealed Weapons Permits: Applications are available at the Petroleum County Sheriff’s Office.
Petroleum County Search and Rescue: Petroleum County Search and Rescue is primarily made up of volunteers. There are currently 12 members in the department which is led by Sheriff Cassel with Deputy Sheriff Clark as the second in command. The unit is capable of performing rescues in almost any situation from high angle rope rescue to searching for lost hunters in the rugged terrain of the Missouri Breaks in northern Petroleum County. If you are interested in volunteering please call 406-429-6551.
Sheriff: Sheriff Bill Cassell has worked for Petroleum County Sheriff’s Office Since May of 2007. He started his Law Enforcement career in the US Navy as a Military Policeman in May of 2002. In August of that year he graduated Naval Master at Arms Military Police Academy at Lackland AFB, San Antonio, TX. For 5 years Bill served as a Military Policeman both at Naval Base Kitsap, Bremerton, WA, and a tour in the Middle East at Naval Station Bahrain, Manama, Bahrain. Sheriff Cassell switched from active duty to the Naval Reserves in 2007 and came to work for Petroleum County. Bill attended and graduated from Montana Law Enforcement Academy in March of 2008 and became POST certified in August of the same year. During his time in Petroleum County, Bill has developed the Petroleum County DUI Task Force, created a department policy manual and started a community Jiu Jitsu self-defense program and a women’s hand gun self-defense shooting class. Along with his duties as Sheriff, Bill is also the Petroleum County Disaster and Emergency Services (DES) Coordinator through which he serves the County as the point of contact for all matters involving state assistance with Emergency Management. Today he is still serving in the Naval Reserves and plans on being a part of this community for many years to come.