Caller ID for
Area code 307
Area code 307 Cheyenne, Wyoming
Area code 307 is one of the original 1947 area codes, in Wyoming, with numbers assigned in Cheyenne, Casper, Jackson and 72 more places. It’s 10:10 PM there now.
- State
- WyomingThe only area code in Wyoming
- Time zone
- Mountain10:10 PM there now
- Exchanges
- 49975 places
- Overlay
- NoneThe only code for its area
- No sign-up
- We never contact the number
- Spam risk included
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Where area code 307 is
Numbers in 307 are assigned to 75 places in 23 counties: Laramie County, Natrona County, Fremont County, Sweetwater County, Park County, Lincoln County, plus 17 more.
No single place dominates: Cheyenne, the largest, has 12% of the exchanges.
- Cheyenne60
- Casper40
- Jackson21
- Gillette21
- Laramie18
- Rock Springs17
- Sheridan17
- Cody15
- Riverton13
- Evanston13
- Lander11
- Powell10
- Green River10
- Buffalo9
- Douglas9
- Rawlins9
- Afton8
- Wheatland8
- Pinedale7
- Torrington7
- Lusk6
- Kemmerer6
- Newcastle6
- Sundance5
Phone companies in 307
499 blocks of numbers in 307 are held by 46 phone companies. The most belong to Lumen (CenturyLink) (97), Union Telephone (65) and Verizon Wireless (60).
A mix: about 25% wireless, 43% local phone and cable and 32% other carriers, including internet phone services.
A block’s holder is the company it was first assigned to; numbers can move to other carriers since.
History and overlays
307 has been in service since 1947, when the first North American area codes were set up.
72 new exchanges were assigned since 2021, the latest in September 2026.
Calling 307
It’s 10:10 PM Mountain time in 307 right now.
From elsewhere in the U.S., dial 1, 307 and the 7-digit number.
Nearby area codes
307 is Wyoming’s only area code.
- 970 · Fort Collins, CO · about 217 mi
- 983 · Denver, CO · about 231 mi
- 720 · Denver, CO · about 234 mi
- 748 · Durango, CO · about 235 mi
- 303 · Denver, CO · about 235 mi
- 385 · Salt Lake City, UT · about 274 mi
From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.
Map of the 307 area code
Map of the 307 area code around Cheyenne, Casper and Jackson, Wyoming.
Cities on the map
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Questions about 307
Where is area code 307?
In Wyoming, covering Cheyenne, Casper and Jackson and other places across 23 counties.
What time zone is 307 in?
Mountain time. It was 10:10 PM there when this page loaded.
Is 307 an overlay?
No. 307 is the only area code for its area right now.
Which phone companies have 307 numbers?
46 companies hold blocks; the most belong to Lumen (CenturyLink), Union Telephone and Verizon Wireless. About 25% of blocks are wireless.
Is 307 running out of numbers?
Not on record. 72 new exchanges have been assigned since 2021.