Looking for a Great Falls ZIP code or trying to match a ZIP to its telephone area code? This directory maps the ZIP codes of Great Falls, Montana, to their neighborhoods, counties, and the area codes that serve them. Use it to address mail correctly, verify a caller’s location, or understand how Great Falls’s postal and telephone geography line up.
Great Falls ZIP Codes & Area Codes at a Glance
| Detail | Information |
|---|---|
| Total ZIP Codes | 3+ |
| Primary & Overlay Area Codes | 406 |
| Major Counties | Cascade County |
| Time Zone | Mountain Time (MT, UTC-7 / UTC-6) |
Great Falls ZIP Code Directory
The table below lists major Great Falls ZIP codes with the neighborhood or district each covers, the telephone area code that serves it, and the county it falls in.
| ZIP Code | Neighborhood / District | Area Code | County |
|---|---|---|---|
| 59401 | Downtown / Central | 406 | Cascade |
| 59404 | North Great Falls | 406 | Cascade |
| 59405 | Southeast Great Falls | 406 | Cascade |
Beyond the neighborhoods listed above, Great Falls also has ZIP codes reserved for post-office boxes, large-volume business mailers, universities, and government facilities that do not correspond to a single residential district. When you are unsure which code to use, the USPS ZIP Code Lookup confirms the exact ZIP for any street address, while the area code shown in each row indicates the telephone prefix that most commonly serves that part of Great Falls. Mail sorted to the correct ZIP+4 moves faster and is less likely to be delayed or returned.
How Great Falls ZIP Codes and Area Codes Align
A ZIP code is a postal routing number, while an area code is a telephone routing number, so the two systems do not map one-to-one. In Great Falls, the 406 area code covers the same territory that dozens of ZIP codes divide up. A single ZIP code can contain phone numbers from more than one area code, and a single area code spans many ZIP codes. For a full breakdown of the telephone side, see the Great Falls area code guide.
Because Montana uses 10-digit dialing, always dial the area code plus the seven-digit number when calling a Great Falls line, even locally. When you only have a ZIP code, the directory above is the quickest way to see which area code most likely serves that part of the city.
Postal & Telecom Scam Warnings in Great Falls
With Malmstrom Air Force Base nearby, watch for military-targeted rental listings and bogus veterans’ benefit offers. Across Great Falls ZIP codes, watch for USPS “undelivered package” smishing texts that ask you to pay a small redelivery fee, address-change and mail-hold fraud, and area-code spoofing that makes robocalls appear to come from a local Great Falls number. The Postal Service never texts you a payment link for a package, and legitimate callers do not demand gift cards or wire transfers. Report mail fraud to the U.S. Postal Inspection Service and unwanted calls to the FTC at reportfraud.ftc.gov.
Frequently Asked Questions
How many ZIP codes does Great Falls have?
Great Falls has approximately 3+ ZIP codes covering its neighborhoods and districts across Cascade County.
What area codes serve Great Falls?
Great Falls is served by the 406 area code. See the Great Falls area code guide for full details.
Do ZIP codes and area codes match up in Great Falls?
Not exactly. ZIP codes route mail and area codes route calls, so one ZIP code can include more than one area code and each area code spans many ZIP codes. The directory above shows the most common pairing for each ZIP.
What is the main ZIP code for Great Falls?
Great Falls’s core ZIP codes are listed at the top of the directory table above; downtown and central neighborhoods usually carry the lowest-numbered ZIP codes in the city.
Are ZIP codes and area codes the same thing?
No. A ZIP code is a five-digit postal code used to route mail, while an area code is the three-digit prefix used to route telephone calls. Great Falls uses both systems, but they were designed independently and cover different-sized areas, which is why one ZIP code can overlap more than one area code.
What time zone is Great Falls in?
Great Falls observes Mountain Time (MT, UTC-7 / UTC-6).