I promised this a long time ago and then didn't follow through. I just found a 2022 document showing all the forest and ranger district numbering. I was only asked to provide Colorado, but will include Wyoming, South Dakota, Nebraska and Kansas also. This will show the National Forest (NF) and its number within the region followed by the name and number of each ranger district. There numbers skipped throughout due to forest and ranger district consolidations, which is mostly the result of insufficient budgets. Where they exist National Grasslands are also shown with the abbreviation "NG."
These numbers are usually the basis for unit/personnel radio identifiers (AKA "callsigns").
R2 Rocky Mountain Region
02 Bighorn NF
01 Powder River
04 Medicine Wheel
06 Tongue
03 Black Hills NF
01 Bearlodge
03 Hell Canyon
06 Mystic
08 Northern Hills
04 Grand Mesa, Uncompahgre and Gunnison NFs
02 Grand Valley
05 Norwood
06 Ouray
07 Gunnison
08 Paonia
09 Taylor
06 Medicine Bow-Routt NFs
01 Yampa
02 Brush Creek-Hayden
03 Hahns Peak-Bears Ears
04 Parks
05 Laramie
09 Taylor
07 Nebraska NF
01 Bessey
02 Pine Ridge
05 Fall River
06 Wall
09 Fort Pierre NG
09 Rio Grande
01 Forest Supervisor's Office
03 Canejos Peak
04 Divide
07 Saguache
10 Arapaho and Roosevelt NFs
01 Boulder
05 Canyon Lakes
06 Pawnee NG
07 Clear Creek
08 Sulphur
12 Pike and San Isabel NFs
01 Leadville
02 Salida
03 San Carlos
06 Comanche NG
07 Cimarron NG
09 Pikes Peak
10 South Park
11 South Platte
13 San Juan NF
05 Mancos/Dolores
06 Pagosa
08 Columbine
Shoshone NF
01 Clarks Fork
02 Greybull
03 Washakie
04 Wapiti
05 Wind River
White River NF
01 Aspen
02 Blanco
03 Sopris
04 Eagle
07 Holy Cross
08 Rifle
10 Dillon
I hope this helps decipher some identifiers you may hear.
es93546
These numbers are usually the basis for unit/personnel radio identifiers (AKA "callsigns").
R2 Rocky Mountain Region
02 Bighorn NF
01 Powder River
04 Medicine Wheel
06 Tongue
03 Black Hills NF
01 Bearlodge
03 Hell Canyon
06 Mystic
08 Northern Hills
04 Grand Mesa, Uncompahgre and Gunnison NFs
02 Grand Valley
05 Norwood
06 Ouray
07 Gunnison
08 Paonia
09 Taylor
06 Medicine Bow-Routt NFs
01 Yampa
02 Brush Creek-Hayden
03 Hahns Peak-Bears Ears
04 Parks
05 Laramie
09 Taylor
07 Nebraska NF
01 Bessey
02 Pine Ridge
05 Fall River
06 Wall
09 Fort Pierre NG
09 Rio Grande
01 Forest Supervisor's Office
03 Canejos Peak
04 Divide
07 Saguache
10 Arapaho and Roosevelt NFs
01 Boulder
05 Canyon Lakes
06 Pawnee NG
07 Clear Creek
08 Sulphur
12 Pike and San Isabel NFs
01 Leadville
02 Salida
03 San Carlos
06 Comanche NG
07 Cimarron NG
09 Pikes Peak
10 South Park
11 South Platte
13 San Juan NF
05 Mancos/Dolores
06 Pagosa
08 Columbine
Shoshone NF
01 Clarks Fork
02 Greybull
03 Washakie
04 Wapiti
05 Wind River
White River NF
01 Aspen
02 Blanco
03 Sopris
04 Eagle
07 Holy Cross
08 Rifle
10 Dillon
I hope this helps decipher some identifiers you may hear.
es93546