The Addressing Office provides an efficient and uniform location identification system for the provision of emergency services. The Office is responsible for assigning and reassigning physical property addresses in Lewis and Clark County and the incorporated cities of Helena and East Helena.
Visit our Addressing Hub Site for an overview of responsibilities, frequently asked questions, and applications.
County Address Online Form
Helena Address Online Form
East Helena Address Online Form
Address Plaque Online Form
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Use these forms if you prefer to print and submit via mail or email (Fillable PDF):
County Address(PDF, 47KB)
Helena Address(PDF, 154KB)
East Helena Address(PDF, 25KB)
Address Plaque(PDF, 49KB)
Site Address and Road Naming Conventions(PDF, 409KB)
Master Street Address Guide(XLSX, 162KB) (MSAG) Spreadsheet of road names in Lewis & Clark County.
Approved/Reserved Road Names(XLSX, 24KB) Spreadsheet of approved/reserved roads that have yet to be final platted.
City/County Addressing Office 316 N. Park Ave. Room 207 Helena, MT. 59623
Phone: 406-447-8367 Fax: 406-447-8386 Email