Helena, MT ZIP Codes, Area Codes and Address Format

City guides  |  June 24, 2026  |  2 min read

Looking up ZIP codes or writing an address in Helena, Montana? Below is a practical reference built from postal data for the city.

State

Montana (MT)

County

Lewis and Clark County

Standard ZIP codes

3

Time zone

Mountain

Helena ZIP codes

These are the standard delivery ZIP codes for Helena. The city has 8 ZIP codes in total when PO Box and unique codes are included.

• 59601
• 59602
• 59626

Area codes in Helena

Helena phone numbers use 406. A single area code keeps local numbers easy to recognize.

Sample Helena addresses

The street lines are invented; the city, state and ZIP codes are real. Use them for form testing, mockups and training materials, never for real orders.

How to write an address in Helena

• End the address with HELENA, MT and the five-digit ZIP code.
• Put apartment or suite numbers at the end of the street line.
• Use USPS abbreviations such as ST, AVE and BLVD.
• Match the ZIP code to the street. Helena has 3 codes, so the city name alone is not enough.

More Montana cities

Arlee, Acton, Missoula, Antelope, Billings, or see all Montana cities.