Wyoming area codes
One area code — 307 — covers all of Wyoming. The state's numbering history begins in 1947 with 307. Most recent addition: 307, in service since 1947.
Coverage runs through 307 (Cheyenne); prefix counts in the table approximate each code's numbering footprint.
Every Wyoming code keeps Mountain time.
Every Wyoming community — Cheyenne, Casper, Jackson, Gillette among the largest — shares the single 307 code, a simplicity most states lost to overlays years ago.
307, in service since 1947, anchors Cheyenne, carries 495 active prefixes across 92 rate centers, split among 51 carriers. 275 of its prefixes are pooled — shared between carriers in thousands-number blocks. It is the only area code serving Wyoming. NANPA projects its capacity to last until 4Q 2054 — no relief needed for decades. Local calls can still be dialed with seven digits — increasingly rare in the NANP.
Toll-free callers are a separate story: 800-family numbers carry no Wyoming geography at all, so an 833 or 877 number is never "from" the state — it belongs to whichever business rents it, anywhere in the NANP.
A number in any of these codes was issued in Wyoming, but portability means its owner may be anywhere today — the codes locate numbers, not people. To dig further, open a code's prefix or cities pages.
| Code | Major area | In service | Overlay complex | Prefixes |
|---|---|---|---|---|
| 307 | Cheyenne | 1947 | — | 495 |
FAQ
How many area codes does Wyoming have?
1 geographic area code is currently in service: 307.
Will Wyoming get a new area code soon?
Not soon. The earliest exhaust forecast in the state is 307 at 4Q 2054, so current codes have ample capacity.
Which time zone are Wyoming numbers in?
All Wyoming area codes are in the Mountain time zone.