This is a complete list of the clear-channel stations in North America by frequency, and I'm sure you'll get them at night:
530: N/A
540: CBK/Watrous, SK, CBT/Grand Falls, NL, XEWA/San Luis Potosi, MX
550: N/A
560: N/A
570: N/A
580: N/A
590: N/A
600: N/A
610: N/A
620: N/A
630: N/A
640: CBN/St. Johns, NL, KFI/Los Angeles, KYUK/Bethel, AK
650: WSM/Nashville, KENI/Anchorage
660: WFAN/New York, KFAR/Fairbanks
670: WSCR/Chicago, KDLG/Dillingham, AK
680: KNBR/San Francisco, KBRW/Barrow, AK
690: CKGM/Montreal, XEWW/Tijuana, MX
700: WLW/Cincinnati, KBYR/Anchorage
710: WOR/New York
720: WGN/Chicago, KOTZ/Kotzebue, AK
730: CKAC/Montreal
740: CFZM/Toronto
750: WSB/Atlanta, KFQD/Anchorage
760: WJR/Detroit
770: WABC/New York, KCHU/Valdez, AK
780: WBBM/Chicago, KNOM/Nome, AK
790: N/A
800: XEROK/Ciudad Juarez, MX
810: KGO/San Francisco, WGY/Schenectady, NY
820: WBAP/Fort Worth, KCBF/Fairbanks
830: WCCO/Minneapolis
840: WHAS/Louisville
850: KOA/Denver, KICY/Nome, AK
860: CJBC/Toronto
870: WWL/New Orleans
880: WCBS/New York
890: WLS/Chicago, KBBI/Homer, AK
900: XEW/Mexico City, MX
910: N/A
920: N/A
930: N/A
940: CFNV/Montreal
950: N/A
960: N/A
970: N/A
980: N/A
990: CBW/Winnipeg
1000: KOMO/Seattle
1010: CBR/Calgary, CFRB/Toronto
1020: KDKA/Pittsburgh, KVNT/Eagle River, AK
1030: WBZ/Boston
1040: WHO/Des Moines
1050: XEG/Monterrey, MX
1060: KYW/Philadelphia, XEEP/Mexico City
1070: KNX/Los Angeles
1080: KRLD/Dallas, WTIC/Hartford, KOAN/Anchorage
1090: KAAY/Little Rock, WBAL/Baltimore, XEPRS/Rosarito, MX
1100: WTAM/Cleveland
1110: KFAB/Omaha, WBT/Charlotte
1120: KMOX/St. Louis
1130: CKWX/Vancouver, KWKH/Shreveport, WBBR/New York
1140: WRVA/Richmond, XEMR/Monterey, MX
1150: N/A
1160: KSL/Salt Lake City
1170: KFAQ/Tulsa, WWVA/Wheeling, KJNP/North Pole, AK
1180: WHAM/Rochester
1190: KEX/Portland, XEWK/Guadalajara, MX
1200: WOAI/San Antonio
1210: WPHT/Philadelphia
1220: XEB/Mexico City, MX
1230: N/A
1240: N/A
1250: N/A
1260: N/A
1270: N/A
1280: N/A
1290: N/A
1300: N/A
1310: N/A
1320: N/A
1330: N/A
1340: N/A
1350: N/A
1360: N/A
1370: N/A
1380: N/A
1390: N/A
1400: N/A
1410: N/A
1420: N/A
1430: N/A
1440: N/A
1450: N/A
1460: N/A
1470: N/A
1480: N/A
1490: N/A
1500: KSTP/St. Paul, WFED/Washington
1510: WLAC/Nashville
1520: KOKC/Oklahoma City, WWKB/Buffalo
1530: KFBK/Sacramento, WCKY/Cincinnati
1540: KXEL/Waterloo
1550: CBEF/Windsor
1560: KNZR/Bakersfield, WFME/New York
1570: XERF/Ciudad Acuna, MX
1580: CKDO/Oshawa, ON
1590: N/A
1600: N/A
1610: N/A
1620: N/A
1630: N/A
1640: N/A
1650: N/A
1660: N/A
1670: N/A
1680: N/A
1690: N/A
1700: N/A
1710: N/A
1720: N/A