What ZIP codes does Montana use for mail and package delivery?

Montana (MT) operates within the 5-digit ZIP prefix range 590xx–599xx, covering numeric postal codes from 59001 – 59937. Mail routed to state capital Helena and key regional centers such as Billings, Missoula, Great Falls adheres to these official USPS boundaries.

Which telephone area codes are valid for Montana?

Montana is served by a single statewide area code: 406. Because Montana operates under a single numbering plan area (NPA), every valid Montana phone number begins with 406 — there are no regional sub-assignments to account for in test data. Synthetic telephone numbers generated for Montana strictly use area code 406 with verified local exchanges to match authentic state dial plans.

How many counties are in Montana?

Montana is divided into 56 counties, including major administrative regions such as Yellowstone, Missoula, Gallatin, Cascade. Generated street addresses reflect these authentic jurisdictional subdivisions and their corresponding postal distribution points.

What postal formatting conventions and addressing quirks are unique to Montana?

Single statewide 406 area code across 147,000 square miles, featuring extremely low-density rural star routes and remote ranch fire-number addressing. Extensive tribal nation reservation jurisdictions including Blackfeet, Crow, and Flathead reservations. All addresses generated on this platform format secondary unit designators (Apt, Ste, Fl) and street suffixes according to USPS CASS standards.

Are the Montana addresses generated on this page real places?

No. All street numbers, recipient names, and telephone numbers generated for Montana are entirely synthetic and randomized for software testing, database seed scripts, and form validation. While they use authentic Montana ZIP codes (590xx–599xx), real city names (Billings, Missoula), and verified area codes (406), they do not correspond to real individuals or private residences.

Random Montana Address Generator

Montana ZIP codes span the 590xx–599xx range (59001 – 59937) across 56 counties with 1 active telephone area code (406).

Generate a realistic, USPS Publication 28-compliant random Montana address with authentic postal routing, real ZIP codes, and local area codes. Featuring verified ZIP prefix coverage across 590xx–599xx, realistic street grids from Billings and Missoula, official area codes (406), and accurate county assignments. Engineered specifically for QA automation, form validation, and software testing.

Official Montana Postal & Geographic Reference Specifications

Geographic & Postal Parameter	Official State Specification	Standardization Reference
Postal State Abbreviation	MT	USPS Publication 28 & ISO 3166-2:US
5-Digit ZIP Prefix Range	590xx–599xx	USPS Sectional Center Facilities (SCFs)
5-Digit ZIP Numeric Span	`59001 – 59937`	Lowest to highest active postal delivery codes
Administrative Jurisdictions	56 Total Counties	US Census Bureau regional boundaries
Active Area Codes (NANPA)	`406` (1 total)	North American Numbering Plan Administrator
Capital & Distribution Centers	Helena (Capital), Billings, Missoula, Great Falls	Primary municipal carrier distribution hubs
Primary Time Zone	Mountain Time (America/Denver, UTC-7 / UTC-6 DST)	Regional postal dispatch & timestamp alignment
Authoritative Validation Source	Montana Public Service Commission & NANPA	Official state regulatory authority

Montana Postal Geography & Key Cities

State Capital: Helena | Postal Code: MT | Total Counties: 56 Counties | ZIP Prefix Range: 590xx–599xx

Verified Data Authority: Montana Public Service Commission & NANPA

Major municipal distribution centers:

Billings
Missoula
Great Falls
Bozeman
Helena

Key Counties & Administrative Jurisdictions

County boundaries dictate local sales tax jurisdictions and carrier route groupings across Montana:

Yellowstone County
Missoula County
Gallatin County
Cascade County

Real Montana Area Codes (MT)

1 active numbering plan area (NPA) serving 56 jurisdictions across Montana.

Active North American Numbering Plan area codes: 406

Postal Delivery Standards & Format Nuances in Montana

Single statewide 406 area code across 147,000 square miles, featuring extremely low-density rural star routes and remote ranch fire-number addressing.
Extensive tribal nation reservation jurisdictions including Blackfeet, Crow, and Flathead reservations.

Standard USPS Publication 28 Test Examples for Montana

Residential Delivery Point:
100 Main St, Apt 4B Billings, MT 59101-1204

Commercial / Multi-Unit Delivery Point:
Montana Logistics & Software Corp 500 Enterprise Way, Suite 300 Missoula, MT 59801-4810

Frequently Asked Questions about Montana Addresses

What ZIP codes does Montana use for mail and package delivery?: Montana (MT) operates within the 5-digit ZIP prefix range 590xx–599xx, covering numeric postal codes from 59001 – 59937. Mail routed to state capital Helena and key regional centers such as Billings, Missoula, Great Falls adheres to these official USPS boundaries.
Which telephone area codes are valid for Montana?: Montana is served by a single statewide area code: 406. Because Montana operates under a single numbering plan area (NPA), every valid Montana phone number begins with 406 — there are no regional sub-assignments to account for in test data. Synthetic telephone numbers generated for Montana strictly use area code 406 with verified local exchanges to match authentic state dial plans.
How many counties are in Montana?: Montana is divided into 56 counties, including major administrative regions such as Yellowstone, Missoula, Gallatin, Cascade. Generated street addresses reflect these authentic jurisdictional subdivisions and their corresponding postal distribution points.
What postal formatting conventions and addressing quirks are unique to Montana?: Single statewide 406 area code across 147,000 square miles, featuring extremely low-density rural star routes and remote ranch fire-number addressing. Extensive tribal nation reservation jurisdictions including Blackfeet, Crow, and Flathead reservations. All addresses generated on this platform format secondary unit designators (Apt, Ste, Fl) and street suffixes according to USPS CASS standards.
Are the Montana addresses generated on this page real places?: No. All street numbers, recipient names, and telephone numbers generated for Montana are entirely synthetic and randomized for software testing, database seed scripts, and form validation. While they use authentic Montana ZIP codes (590xx–599xx), real city names (Billings, Missoula), and verified area codes (406), they do not correspond to real individuals or private residences.

Nearby & Bordering States

Explore test address generators for states sharing a geographic border with MT:

Montana ZIP Prefixes and Sectional Center Facilities

Mail addressed to Montana is sorted through the processing facilities below before local delivery. The first three digits of a ZIP code identify which one, so the prefix alone places an address within the state.

ZIP prefix	Sectional Center Facility	County
591xx	Billings	Yellowstone County
597xx	Bozeman	Gallatin County
598xx	Missoula	Missoula County

These 3 prefixes cover the 590xx–599xx range. Look up any ZIP prefix to see its facility and generate valid ZIP codes inside it.