I just found an old radio listing from the Spokesman-Review dated Sep. 10, 1975! Here are the radio stations and formats at the time.
AM
590-KHQ
Popular music Mon-Sat 5AM-12PM, Sun 7AM to 11PM
630-KZUN (ABC)
Popular music 6AM to sunset
790-KJRB
Rock 24 hrs
920-KXLY (CBS)
Adult contempory music Mon-Fri 5AM-1AM, Sat 6AM-1AM, Sun 7AM-11PM
970-KREM
Rock 24 hrs
1230-KSPO
Contempory C&W music 24 hrs
1280-KUDY
Gospel 6AM-Sunset
1330-KMBI
Religious 6AM-sunset Mon-Sat, 7AM-Sunset Sunday
1380-KEZE (NOW DARK)
Popular music 6AM to sunset
1440-KXXR
Popular music 6AM to Sunset
1510-KGA
C&W music 24 hrs
FM
91.1-KPBX (NPR)
Non commercial public radio. Sun-Fri Noon-Midnight, music and talk
91.9-KSFC
Music during college hours.
92.9-KREM
Progressive rock 5AM-1AM Mon-Thurs, 1AM Fri-Sat, Midnight Sun.
93.7-KXXR (STEREO)
Popular music 24 hrs
96.1-KZUN
Popular music 24 hrs
98.1-KHQ (STEREO)
Rock 6AM-Midnight
99.9-KXLY (STEREO)
Beautiful music 6:30AM-1AM Mon-Thurs, 1AM Fri-Sat, Midnight sun.
105.7-KEZE (STEREO)
Popular music 24 hrs
107.9-KMBI
Religious 5:30-1AM Mon-Sat, 7AM-1AM Sun.
-crainbebo
AM
590-KHQ
Popular music Mon-Sat 5AM-12PM, Sun 7AM to 11PM
630-KZUN (ABC)
Popular music 6AM to sunset
790-KJRB
Rock 24 hrs
920-KXLY (CBS)
Adult contempory music Mon-Fri 5AM-1AM, Sat 6AM-1AM, Sun 7AM-11PM
970-KREM
Rock 24 hrs
1230-KSPO
Contempory C&W music 24 hrs
1280-KUDY
Gospel 6AM-Sunset
1330-KMBI
Religious 6AM-sunset Mon-Sat, 7AM-Sunset Sunday
1380-KEZE (NOW DARK)
Popular music 6AM to sunset
1440-KXXR
Popular music 6AM to Sunset
1510-KGA
C&W music 24 hrs
FM
91.1-KPBX (NPR)
Non commercial public radio. Sun-Fri Noon-Midnight, music and talk
91.9-KSFC
Music during college hours.
92.9-KREM
Progressive rock 5AM-1AM Mon-Thurs, 1AM Fri-Sat, Midnight Sun.
93.7-KXXR (STEREO)
Popular music 24 hrs
96.1-KZUN
Popular music 24 hrs
98.1-KHQ (STEREO)
Rock 6AM-Midnight
99.9-KXLY (STEREO)
Beautiful music 6:30AM-1AM Mon-Thurs, 1AM Fri-Sat, Midnight sun.
105.7-KEZE (STEREO)
Popular music 24 hrs
107.9-KMBI
Religious 5:30-1AM Mon-Sat, 7AM-1AM Sun.
-crainbebo