I found a Rand McNally atlas from 1989 and on the last page it listed several 50kw stations. Obviously some of these stations have changed call signals or frequencies(WNBC and WFAN at 1050 were already outdated in 1989!) as well as other various things. I also suspect some stations have been left out. Here is how Rand McNally listed for clear channel stations of 1989:
Alaska:
660 KYAK Anchorage
750 KFQD Ancorage
820 KCBF Fairbanks
Arizona:
660 KTNN Window Rock
Arkansas:
1090 KAAY Little Rock
California:
940 KFRE Fresno
640 KFI Los Angeles
1020 KTNQ Los Angeles
1070 KNX Los Angeles
1140 KRAK Sacramento
1530 KFBK Sacramento
680 KNBR San Francisco
810 KGO San Francisco
1100 KFAX San Francisco
Colorado:
850 KOA Denver
District of Columbia:
1500 WTOP Washington
Connecticut:
1080 WTIC Hartford
Florida:
710 WAQI Miami
Georgia:
750 WSB Atlanta
Idaho:
670 KBOI Boise
Illinois:
670 WMAQ Chicago
720 WGN Chicago
780 WBBM Chicago
890 WLS Chicago
1000 WLUP Chicago
Indiana:
1190 WOWO Fort Wayne
Iowa:
1040 WHO Des Moines
1540 WXEL Waterloo
Kentucky:
840 WHAS Louisville
Louisiana:
870 WWL New Orleans
1130 KWKH Shreveport
Maryland:
1090 WBAL Baltimore
Massachusetts:
680 WRKO Boston
850 WHDH Boston
1030 WBZ Boston
1510 WSSH Boston
Michigan:
760 WJR Detroit
Minnesota:
830 WCCO Minneapolis
1130 WDGY Minneapolis
Missouri:
1120 KMOX St. Louis
Nebraska:
880 KRVN Lexington
1100 KFAB Omaha
Nevada:
720 KDWN Las Vegas
780 KROW Reno
New Mexico:
770 KKOB Albuquerque
1020 KCKN Roswell
New York:
1540 WPTR Albany
1520 WWKB Buffalo
660 WNBC New York
710 WOR New York
770 WABC New York
880 WCBS New York
1010 WINS New York
1050 WFAN New York
1130 WNEW New York
1560 WQXR New York
1180 WHAM Rochester
810 WGY Schenectady
North Carolina:
1110 WBT Charlotte
680 WPTF Raleigh
Ohio:
700 WLW Cincinnati
1530 WCKY Cincinnati
1100 WWWE Cleveland
1220 WGAR Cleveland
Oklahoma:
1520 KOMA Oklahoma City
1170 KVOO Tulsa
Oregon:
1120 KPNW Eugene
1190 KEX Portland
Pennsylvania:
1060 KYW Philadelphia
1210 WCAU Philadelphia
1020 KDKA Pittsburgh
Rhode Island:
900 WEAN Providence
South Carolina:
660 WESC Greenville
Tennessee:
650 WSM Nashville
1510 WLAC Nashville
Texas:
1080 KRLD Dallas
820 WBAP Fort Worth
740 KTRH Houston
1200 WOAI San Antonio
Utah:
1160 KSL Salt Lake City
Virginia:
1140 WRVA Richmond
Washington:
710 KIRO Seattle
1000 KOMO Seattle
1090 KING Seattle
1510 KGA Spokane
West Virginia:
1170 WWVA Wheeling
Wyoming:
1030 WTWO Casper
Alaska:
660 KYAK Anchorage
750 KFQD Ancorage
820 KCBF Fairbanks
Arizona:
660 KTNN Window Rock
Arkansas:
1090 KAAY Little Rock
California:
940 KFRE Fresno
640 KFI Los Angeles
1020 KTNQ Los Angeles
1070 KNX Los Angeles
1140 KRAK Sacramento
1530 KFBK Sacramento
680 KNBR San Francisco
810 KGO San Francisco
1100 KFAX San Francisco
Colorado:
850 KOA Denver
District of Columbia:
1500 WTOP Washington
Connecticut:
1080 WTIC Hartford
Florida:
710 WAQI Miami
Georgia:
750 WSB Atlanta
Idaho:
670 KBOI Boise
Illinois:
670 WMAQ Chicago
720 WGN Chicago
780 WBBM Chicago
890 WLS Chicago
1000 WLUP Chicago
Indiana:
1190 WOWO Fort Wayne
Iowa:
1040 WHO Des Moines
1540 WXEL Waterloo
Kentucky:
840 WHAS Louisville
Louisiana:
870 WWL New Orleans
1130 KWKH Shreveport
Maryland:
1090 WBAL Baltimore
Massachusetts:
680 WRKO Boston
850 WHDH Boston
1030 WBZ Boston
1510 WSSH Boston
Michigan:
760 WJR Detroit
Minnesota:
830 WCCO Minneapolis
1130 WDGY Minneapolis
Missouri:
1120 KMOX St. Louis
Nebraska:
880 KRVN Lexington
1100 KFAB Omaha
Nevada:
720 KDWN Las Vegas
780 KROW Reno
New Mexico:
770 KKOB Albuquerque
1020 KCKN Roswell
New York:
1540 WPTR Albany
1520 WWKB Buffalo
660 WNBC New York
710 WOR New York
770 WABC New York
880 WCBS New York
1010 WINS New York
1050 WFAN New York
1130 WNEW New York
1560 WQXR New York
1180 WHAM Rochester
810 WGY Schenectady
North Carolina:
1110 WBT Charlotte
680 WPTF Raleigh
Ohio:
700 WLW Cincinnati
1530 WCKY Cincinnati
1100 WWWE Cleveland
1220 WGAR Cleveland
Oklahoma:
1520 KOMA Oklahoma City
1170 KVOO Tulsa
Oregon:
1120 KPNW Eugene
1190 KEX Portland
Pennsylvania:
1060 KYW Philadelphia
1210 WCAU Philadelphia
1020 KDKA Pittsburgh
Rhode Island:
900 WEAN Providence
South Carolina:
660 WESC Greenville
Tennessee:
650 WSM Nashville
1510 WLAC Nashville
Texas:
1080 KRLD Dallas
820 WBAP Fort Worth
740 KTRH Houston
1200 WOAI San Antonio
Utah:
1160 KSL Salt Lake City
Virginia:
1140 WRVA Richmond
Washington:
710 KIRO Seattle
1000 KOMO Seattle
1090 KING Seattle
1510 KGA Spokane
West Virginia:
1170 WWVA Wheeling
Wyoming:
1030 WTWO Casper