Area code
Area code 307 — Cheyenne, WY
Wyoming · in service since 1947
Area code 307 covers all of Wyoming. No other area code overlays it.
Local time in Cheyenne
Spam reports from Sep 23 – Oct 22, 2026
Average #257 of 461 codes
345 FTC complaints
Consumer reports, not verified by the FTC.
See the reports- Time zoneMountain Time
- Local calls7 digits
- Prefixes525 assigned
- Runs out~4Q 2054
- Unwanted call?Block & report
Spam call reports about 307 numbers
Complaints by week
Sep 11 – Oct 22, 2026Show as table
| Week starting | Complaints |
|---|---|
| Sep 7 (3 days) | 27 |
| Sep 14 | 88 |
| Sep 21 | 80 |
| Sep 28 | 100 |
| Oct 5 | 63 |
| Oct 12 | 69 |
| Oct 19 (4 days) | 54 |
Compared with all codes
- Robocalls
- 64%all codes 75%
- Callers with the same code
- 32%all codes 35%
- Rank by complaints
- #257of 461 · middle half
- FCC complaints, Oct 2025 – Sep 2026
- 7019 about text messages
What the calls were about
Sep 11 – Oct 22, 2026
| Subject | Complaints | |
|---|---|---|
| Reducing your debt (credit cards, mortgage, student loans) | 149 31% | |
| Calls pretending to be government, businesses, or family and friends | 24 5% | |
| Dropped call or no message | 19 4% | |
| Medical & prescriptions | 11 2% | |
| Home improvement & cleaning | 7 1% | |
| Lotteries, prizes & sweepstakes | 3 1% |
Where the people who complained live
Sep 11 – Oct 22, 2026
| State | Complaints | |
|---|---|---|
| Wyoming | 155 32% | |
| Florida | 36 7% | |
| Texas | 30 6% | |
| California | 27 6% | |
| New York | 18 4% |
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 307 location and prefixes
| Exchange (NANPA) | Place | County | Prefixes |
|---|---|---|---|
| CHEYENNE | Cheyenne | Laramie County | 60 |
| CASPER | Casper | Natrona County | 40 |
| GILLETTE | Gillette | Campbell County | 21 |
| JACKSON | Jackson | Teton County | 21 |
| LARAMIE | Laramie | Albany County | 18 |
| ROCK SPG | Rock Springs | Sweetwater County | 17 |
| SHERIDAN | Sheridan | Sheridan County | 17 |
| CODY | Cody | Park County | 15 |
| EVANSTON | Evanston | Uinta County | 13 |
| RIVERTON | Riverton | Fremont County | 13 |
Plus 82 smaller exchange areas.
Source: NANPA CO codes of Oct 23, 2026; places: U.S. Census Bureau, matched by DialWhere (how).
NANPA record
- Location
- Wyoming
- Assigned by NANPA
- 1947
- Local dialing
- 7 digits (NANPA: 7D)
Source: NANPA, NPA database of Oct 24, 2026.
Is 307 running out of numbers?
Previous forecast (October 2025): 2050, moved later by 4 years.
Forecast exhaust year by edition
Source: NANPA NRUF forecast, April 2026 edition.
Who holds 307 prefixes
The five largest of 54 original holders
As listed by NANPA, not today’s carrier.
| Holder (as listed) | Prefixes | |
|---|---|---|
| Qwest Corporation | 83 16% | |
| Union Telephone Company | 65 12% | |
| Verizon Wireless | 60 11% | |
| New Cingular Wireless PCS, LLC | 49 9% | |
| Onvoy, LLC | 40 8% |
Source: NANPA CO codes of Oct 23, 2026.
Questions about area code 307
What area code is 307?
A Wyoming area code, in service since 1947.
Where is 307 area code, and what time zone is it in?
Cheyenne, WY; Mountain Time.
Why am I getting spam calls from 307?
345 FTC complaints from Sep 23 – Oct 22, 2026, most often about debt reduction (not verified by the FTC; caller ID can be spoofed).
Will 307 get a new area code?
NANPA forecasts exhaust in 4Q 2054; no relief planning listed.