| Fire department | City | County | Career firefighters | Website |
|---|---|---|---|---|
| Cheyenne Fire & Rescue | Cheyenne | Laramie | 91 | Official site |
| Casper Fire-EMS Department | Casper | Natrona | 74 | Official site |
| 90 CES/CEF F.E. Warren AFB | Cheyenne | Laramie | 53 | — |
| City of Laramie Fire Department | Laramie | Albany | 48 | Official site |
| Albany County Fire Department | Laramie | Albany | 41 | — |
| Rock Springs Fire Department | Rock Springs | Sweetwater | 34 | — |
| Wyoming Air National Guard Fire Department | Cheyenne | Laramie | 31 | — |
| Campbell County Fire Department | Gillette | Campbell | 21 | Official site |
| Natrona County Fire Protection District | Casper | Natrona | 20 | Official site |
| City of Sheridan Fire-Rescue | Sheridan | Sheridan | 16 | Official site |
| Rawlins Fire Department | Rawlins | Carbon | 11 | Official site |
| Mills Fire Department | Mills | Natrona | 10 | Official site |
| Evansville Emergency Service - Evansville Fire-EMS | Evansville | Natrona | 8 | — |
| Laramie County Fire District #1 | Cheyenne | Laramie | 8 | Official site |
| Natrona County International Airport Fire Department | Casper | Natrona | 7 | — |
| Northeast Wyoming Regional Airport ARFF | Gillette | Campbell | 7 | — |
| Jackson Hole Fire/EMS | Jackson | Teton | 5 | Official site |
| Uinta County Fire & Ambulance JPB | Evanston | Uinta | 5 | — |
| Park County Fire District 2 | Cody | Park | 4 | — |
| Sweetwater County Fire Department | Rock Springs | Sweetwater | 4 | — |
| Sweetwater County Fire District #1 | Rock Springs | Sweetwater | 4 | Official site |
| Fremont County Fire Protection District | Riverton | Fremont | 3 | Official site |
| Green River Fire Department | Green River | Sweetwater | 3 | Official site |
| Worland Fire Protection District #1 | Worland | Washakie | 3 | Official site |
| Weston County Fire Protection District | Newcastle | Weston | 2 | — |
| Alpine Fire District | Alpine | Lincoln | 1 | — |
| Carbon County Fire Department/Hanna Fire Department & EMS | Hanna | Carbon | 1 | — |
| Johnson County Fire Control District #1 | Buffalo | Johnson | 1 | — |
| Lander Volunteer Fire Department | Lander | Fremont | 1 | Official site |
| Sublette County Unified Fire Department | Pinedale | Sublette | 1 | Official site |
| Yellowstone National Park Fire Department | Yellowstone National Park | Park | 1 | — |
Largest first by career firefighters, as each employer reports it to its federal registry.
Source: U.S. Fire Administration (FEMA), National Fire Department Registry. Data captured September 30, 2026.