Google Books has digitized thousands of back issues of Billboard magazine. And I just ran across the January 25, 1986 issue with the Fall, 1985 Arbitron ratings for Phoenix.
These were the then-current standings for the market when I arrived in town a couple of months later (all numbers are total audience 12+ Mon-Sun 6A-12M):
1. KNIX AM-FM (102.5 & 1580-Country) 12.8
2. KUPD-FM (97.9-AOR) 10.4
3. KTAR-AM (620-News/Talk) 9.3
4. KQYT-FM (95.5-Easy Listening) 7.1
5. KMEO-FM (96.9-Easy Listening) 6.7
6. KZZP-FM (104.7-CHR) 6.2
7. KOOL-FM (94.5-Oldies) 5.9
8. KOY-AM (550-Adult Contemporary) 4.8
9. KKLT-FM (98.7-Adult Contemporary) 4.6
10.KDKB-FM (93.3-AOR) 3.7
11.KOPA-FM (100.7-CHR) 3.4 (they flipped to Classic Rock as KSLX right after this book ended)
12.KLFF-AM (1360-Adult Standards) 3.3
13.KLZI-FM (99.9-Adult Contemporary) 3.2
14.KUKQ-AM (1060-Urban) 2.9
15.KSTM-FM (107.1-AOR) 2.0
16.KONC-FM (101.5-Classical) 1.9
17.KPHX-AM (1480-Spanish) 1.7
18.KOOL-AM (960-Adult Contemporary) 1.4
19.KRDS-AM (1190-Christian) 1.3
19.KVVA-AM (860-Spanish) 1.3
Billboard only listed stations with a 1.0 or better. Apparently, KFYI (910 AM), which debuted in late August or early September, according to Billboard, hadn't gotten up to that level yet, nor had their then-sister KKFR (92.3 FM).
In April 2010, 31 stations did a 1.0 or better.
These were the then-current standings for the market when I arrived in town a couple of months later (all numbers are total audience 12+ Mon-Sun 6A-12M):
1. KNIX AM-FM (102.5 & 1580-Country) 12.8
2. KUPD-FM (97.9-AOR) 10.4
3. KTAR-AM (620-News/Talk) 9.3
4. KQYT-FM (95.5-Easy Listening) 7.1
5. KMEO-FM (96.9-Easy Listening) 6.7
6. KZZP-FM (104.7-CHR) 6.2
7. KOOL-FM (94.5-Oldies) 5.9
8. KOY-AM (550-Adult Contemporary) 4.8
9. KKLT-FM (98.7-Adult Contemporary) 4.6
10.KDKB-FM (93.3-AOR) 3.7
11.KOPA-FM (100.7-CHR) 3.4 (they flipped to Classic Rock as KSLX right after this book ended)
12.KLFF-AM (1360-Adult Standards) 3.3
13.KLZI-FM (99.9-Adult Contemporary) 3.2
14.KUKQ-AM (1060-Urban) 2.9
15.KSTM-FM (107.1-AOR) 2.0
16.KONC-FM (101.5-Classical) 1.9
17.KPHX-AM (1480-Spanish) 1.7
18.KOOL-AM (960-Adult Contemporary) 1.4
19.KRDS-AM (1190-Christian) 1.3
19.KVVA-AM (860-Spanish) 1.3
Billboard only listed stations with a 1.0 or better. Apparently, KFYI (910 AM), which debuted in late August or early September, according to Billboard, hadn't gotten up to that level yet, nor had their then-sister KKFR (92.3 FM).
In April 2010, 31 stations did a 1.0 or better.