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Montana ZIP codes

All 404 ZIPs in Montana, 59001 to 59937. Tap one on the map or in the list.

404

ZIP codes

1,117,606

people live in them

56

counties

35

PO Box & no-area ZIPs

Most people

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All 404 Montana ZIP codes

ZIP codes by county

Pick a county for its ZIP list and map. Counts include ZIPs that only partly reach into the county.

Questions people actually ask

How many ZIP codes are in Montana?

404 ZIP codes are in use in Montana. 369 cover a delivery area, and 35 are PO Box, single-building or organization ZIPs with no area of their own.

What do Montana ZIP codes start with?

Montana ZIP codes start with these three-digit prefixes: 590–599. Each prefix is a mail sorting area run from one processing center.

Which Montana ZIP code has the most people?

59901 in Kalispell has the most residents of any Montana ZIP, about 63,161 people in the Census Bureau’s ACS 2020–2024 estimates.

Which Montana county has the most ZIP codes?

Yellowstone County touches 26 ZIP codes, the most of the 56 counties in Montana. 121 Montana ZIPs reach into more than one county.

Are these the official USPS ZIP code boundaries?

The map uses Census ZIP Code Tabulation Areas, the standard public stand-in for USPS delivery areas. They match for almost every home. For a mailing address, the USPS ZIP Code lookup has the final word.

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Updated 2026-11-10 · Where the data comes from