Here is the Atlanta radio dial from 1966, courtesy of the AJC. They only list one affiliate metro-wide for each of the four networks.
("Standards" is what the AJC called BM/EZ, and "Popular" is what they called MOR. Also odd that WPLO is not listed as "Town & Country" when they practically originated the format.)
WPLO 590 Country
WSB 750 Popular (NBC)
WQXI 790 Top 40
WERD 860 R&B/Jazz
WGST 920 Popular (ABC)
WIIN 970 Popular
WGUN 1010 Country (Mutual)
WBIE 1080 Standards (CBS)
WGKA 1190 Classical
WFOM 1230 Top 40
WTJH 1260 Country
WOMN 1310 Popular
WIGO 1340 R&B
WAOK 1380 R&B
WAVO 1420 Religious
WYZE 1480 Town & Country
WYNX 1550 Town & Country
WAIA 1570 Country (became Top 40 WBAD in 1967)
WABE 90.1 Educational
WGKA 92.9 Classical
WKXI 94.1 Finance
WAVO 94.9 Religious
WKLS 96.1 Standards (Stereo)
WSB 98.5 Popular (Stereo)
WLTA 99.7 Standards (Stereo)
WBIE 101.5 Standards
WPLO 103.3 Popular