If your property doesn't have an address, apply for one. After receiving your official address, contact your local post office to set up mail delivery and determine your mailbox type and location.
Flathead County GIS Department: (406) 758-5540
Glacier County: (406) 873-3652 in Cut Bank or (406) 338-4000 on the Blackfeet Reservation
Lake County GIS Department: (406) 883-7212; Download application here
Lincoln County Rural Addressing: (406) 283-2307; Download application here
Mineral County Environment Health & Planning: (406) 822-3525; Download application here
Missoula County Public Works Department: (406) 258-3701