Probation & Pretrial Facilities in MT Probation & Pretrial Facilities operating within MT. Probation & Pretrial Facilities in MT US Probation & Pretrial Services Office Great Falls, Cascade County US Probation & Pretrial Services Office Helena, Lewis and Clark County US Probation & Pretrial Services Office Billings, Yellowstone County US Probation & Pretrial Services Office Missoula, Missoula County