Welcome to Petroleum County, Montana
Petroleum County
302 East Main
Post Office Box 226
Winnett, MT 59087-0226
P: (406) 429-5551 County Manager/Treasurer/County Superintendent of Schools
F: (406) 429-6328
Hours:
8:00am – 12:00 noon,
1:00 pm-5:00pm,
closed 12:00 noon-1:00 pm for lunch
Montana State Holidays
A list of legal holidays and the dates they are observed - 2013
| Date | Holiday |
| Jannuary 1 | New Years Day |
| January 21 | Martin Luther King Jr. Day |
| February 18 | President's Day |
| May 27 | Memorial Day |
| July 4 | Independence Day |
| September 2 | Labor Day |
| October 14 | Columbus Day |
| November 11 | Veteran's Day |
| November 28 | Thanksgiving Day |
| December 25 | Christmas Day (observe) |