Area code
Area code 406 — Montana
Montana · in service since 1947
Area code 406 covers all of Montana. No other area code overlays it.
Local time in Montana
Spam reports from Sep 23 – Oct 22, 2026
Average #156 of 461 codes
581 FTC complaints
Consumer reports, not verified by the FTC.
See the reports- Time zoneMountain Time
- Local calls10 digits
- Prefixes768 assigned
- Runs out~4Q 2033
- Unwanted call?Block & report
Spam call reports about 406 numbers
Complaints by week
Sep 11 – Oct 22, 2026Show as table
| Week starting | Complaints |
|---|---|
| Sep 7 (3 days) | 39 |
| Sep 14 | 134 |
| Sep 21 | 138 |
| Sep 28 | 115 |
| Oct 5 | 125 |
| Oct 12 | 138 |
| Oct 19 (4 days) | 106 |
Compared with all codes
- Robocalls
- 70%all codes 75%
- Callers with the same code
- 62%all codes 35%
- Rank by complaints
- #156of 461 · middle half
- FCC complaints, Oct 2025 – Sep 2026
- 9624 about text messages
What the calls were about
Sep 11 – Oct 22, 2026
| Subject | Complaints | |
|---|---|---|
| Reducing your debt (credit cards, mortgage, student loans) | 86 11% | |
| Calls pretending to be government, businesses, or family and friends | 73 9% | |
| Medical & prescriptions | 53 7% | |
| Dropped call or no message | 45 6% | |
| Warranties & protection plans | 10 1% | |
| Work from home & other ways to make money | 8 1% |
Where the people who complained live
Sep 11 – Oct 22, 2026
| State | Complaints | |
|---|---|---|
| Montana | 471 59% | |
| California | 50 6% | |
| Florida | 32 4% | |
| Oregon | 31 4% | |
| Kansas | 23 3% |
October 2026 (partial) report · most reported
Consumer reports, not verified by the FTC · source
Source: FTC Do Not Call complaints created Sep 11 – Oct 22, 2026. They are reported by consumers and are not verified by the FTC; caller ID can be spoofed (how we count).
Source: FCC Consumer Complaints data, unwanted calls filed Oct 1, 2025 – Sep 30, 2026, by caller ID; not verified by the FCC.
Area code 406 location and prefixes
| Exchange (NANPA) | Place | County | Prefixes |
|---|---|---|---|
| BILLINGS | Billings | Yellowstone County | 72 |
| MISSOULA | Missoula | Missoula County | 47 |
| HELENA | Helena | Lewis and Clark County | 38 |
| GREATFALLS | Great Falls | Cascade County | 37 |
| BOZEMAN | Bozeman | Gallatin County | 32 |
| KALISPELL | Kalispell | Flathead County | 25 |
| BUTTE | Butte | Silver Bow County | 17 |
| MILES CITY | Miles City | Custer County | 10 |
| SIDNEY | Sidney | Richland County | 9 |
| HAMILTON | Hamilton | Ravalli County | 8 |
Plus 250 smaller exchange areas.
Source: NANPA CO codes of Oct 23, 2026; places: U.S. Census Bureau, matched by DialWhere (how).
NANPA record
- Location
- Montana
- Assigned by NANPA
- 1947
- Local dialing
- 10 digits (NANPA: 10D)
- NANPA planning letters
- PL-556, PL-544
Source: NANPA, NPA database of Oct 24, 2026.
Is 406 running out of numbers?
Previous forecast (October 2025): 2032, moved later by 1 year.
Forecast exhaust year by edition
Source: NANPA NRUF forecast, April 2026 edition.
Who holds 406 prefixes
The five largest of 65 original holders
As listed by NANPA, not today’s carrier.
| Holder (as listed) | Prefixes | |
|---|---|---|
| Qwest Corporation | 132 17% | |
| Verizon Wireless | 119 15% | |
| New Cingular Wireless PCS, LLC | 74 10% | |
| Onvoy, LLC | 43 6% | |
| Triangle Tel. Coop. Assn., Inc. | 39 5% |
Source: NANPA CO codes of Oct 23, 2026.
Questions about area code 406
What area code is 406?
A Montana area code, in service since 1947.
Where is 406 area code, and what time zone is it in?
Montana; Mountain Time.
Why am I getting spam calls from 406?
581 FTC complaints from Sep 23 – Oct 22, 2026, most often about debt reduction (not verified by the FTC; caller ID can be spoofed).
Will 406 get a new area code?
NANPA forecasts exhaust in 4Q 2033; no relief planning listed.