ZIP Codes in Montana
Montana's ZIP codes cover the fourth-largest state in the country by land area, yet one of the least densely populated, with just over 1.1 million residents spread across vast stretches of prairie in the east and dramatic Rocky Mountain terrain in the west. A single Montana ZIP code, particularly in the eastern plains, can cover an area larger than some entire states back east.
How ZIP Codes Are Organized Across the State
Montana's ZIP codes fall within the 59000–59999 range under the USPS system, one of the most compact numeric ranges of any state given how spread out its population actually is. Billings, the state's largest city, sits near 591xx, Missoula, in the mountainous west, carries codes closer to 598xx, and Bozeman, home to Montana State University and increasingly popular with new residents, occupies the 597xx range.
Montana's Major Population Centers
The chart below shows how population spreads across Montana's largest cities - Billings leads, but Bozeman's rapid recent growth has closed much of the gap with the state's more established cities.
Billings' ZIP codes cover Montana's largest city, an economic hub built around energy, agriculture, and healthcare that serves as a regional center for a wide swath of the northern Great Plains. Missoula, in the state's forested western mountains, carries a strong outdoor recreation and university-town character, home to the University of Montana. For a broader comparison, our full US ZIP code directory shows how Montana's compact range fits alongside every other state.
Bozeman and the Growth Boom
Bozeman has become one of the fastest-growing small cities in the entire country over the past decade, driven by its proximity to Yellowstone National Park, a booming outdoor recreation economy, and an influx of remote workers relocating from more expensive coastal states. This growth has pushed Bozeman-area ZIP codes to some of the highest property values in Montana, a dramatic shift from the region's more modest ranching and agricultural roots.
Eastern Montana and the Great Plains
Eastern Montana feels like an entirely different state from the mountainous west - flat, wind-swept prairie dominated by wheat farming and cattle ranching, with ZIP codes here among the largest and least populated in the entire country. This region shares a similar high-plains character with neighboring North Dakota and Wyoming, and the Bakken oil formation straddling the North Dakota border has brought periodic economic booms to communities in Montana's far northeast.
Why ZIP Codes Matter Beyond Mail
In Montana, ZIP codes carry real significance for the agricultural and energy sectors - wheat and cattle operations across the eastern plains rely on ZIP-level data for shipping logistics, while energy companies working the Bakken formation near the North Dakota border use ZIP codes to coordinate workforce housing and services. Real estate around Bozeman has become a closely watched market nationally, given the dramatic price increases tied to the area's population boom.
Border Regions and Neighboring States
Montana shares borders with three US states and a long international border with Canada to the north - one of the longest state-to-country borders in the Lower 48. To the west, the mountainous line with Idaho follows the Continental Divide. To the south, Wyoming shares Yellowstone National Park, which straddles both states. And to the east, North Dakota's flat plains continue Montana's own eastern prairie landscape.
Finding the Right ZIP Code
Use the list below to browse Montana's ZIP codes by city, county, or population - sorted so the most populous areas surface first. Each entry links through to a detailed page with additional demographic data. If you're trying to identify the ZIP code for a specific address rather than browsing by city, the search tool at the top of this page will get you there faster than scrolling through the full list.
Frequently Asked Questions
How many ZIP codes does Montana have?
Montana has around 250 ZIP codes, a relatively low number given the state's enormous size, reflecting how sparsely populated most of the state is outside its handful of cities.
What ZIP code range does Montana use?
Montana ZIP codes fall between 59000 and 59999, one of the most compact ranges of any state despite Montana's large land area.
Why has Bozeman grown so quickly?
Bozeman's proximity to Yellowstone, strong outdoor recreation economy, and appeal to remote workers relocating from higher-cost states have driven some of the fastest population growth of any small city in the country.
Can I look up a Montana ZIP code by city name?
Yes, use the search tool on this page or browse the full list below, which is organized by city and sorted by population.
Whether you're relocating to booming Bozeman, researching ranchland in eastern Montana, or simply trying to pin down the right ZIP code for a specific Montana address, the data below covers every corner of the state - from the Rockies to the Great Plains.