The Addressing Office is responsible for the issuing of new addresses in Lewis and Clark County and the incorporated cities of Helena and East Helena. Duties include maintaining the Address and Road files, approving new road names and readdressing issues for Lewis and Clark County.
Master Street Address Guide
The Master Street Address Guide (MSAG) is a list of all the streets and roads in Lewis & Clark County by name.
Approved/Reserved Road Names
Spreadsheet including approved/reserved road names that have yet to be final platted.
Emergency Response Number
Fire, Police and Ambulance services that would respond to an address.
City/County Addressing Office
316 N. Park Ave. Room 207
Helena, MT. 59623
Address Application Forms
Policies, Resolutions & Conventions
Regulations for Naming and Renaming Roads
(Resolution 2021-63, adopted July 2021)
Street Type Designations