Stillwater County Of--county Offices, Planning Office 400 N 3rd St Columbus, MT 59019 Phone : (406) 322-8050 Business Category Government Offices-County Government Offices & Public Schools Stillwater County Of--planning Office 809 E 4th Ave N Columbus, MT 59019 Phone : (406) 322-8050 Business Category Government Offices-County Legislative Bodies Government Offices & Public Schools