Affiliates

By 1939, NBC's Red and Blue Networks, and the Columbia and Mutual Broadcasting Systems, offered nationwide coverage.^[10] NBC advertising rate cards of the period listed "basic" and "supplemental" affiliated stations. Advertisers were encouraged to buy time for their programs on the full "basic" line-up (plus any "supplemental" stations they wished) but this was open to negotiation. It was not unusual for Red Network advertisers to place shows on Blue Network stations in certain markets (and the other way around). Supplemental stations were generally located in smaller cities away from the network trunk lines. Such stations were usually offered to advertisers as "supplemental stations" on both the Red and Blue Network line-ups.^[11]

East affiliates

Basic

• WEAF (New York)
• CBM (Montreal)
• KYW (Philadelphia)
• WBEN (Buffalo)
• WCAE (Pittsburgh)
• WCSH (Portland, ME)
• WDEL (Wilmington, DE)
• WFBR (Baltimore)
• WGY (Schenectady)
• WJAR (Providence)
• WNAC (Boston)
• WRC (Washington)
• WTAG (Worcester, MA)
• WTAM (Cleveland)
• WTIC (Hartford)
• WWJ (Detroit)

Supplemental

• CBF (Montreal)
• CBL (Toronto)
• CMQ (Havana, Cuba)
• WBRE (Wilkes-Barre)
• WCOL (Columbus, OH)
• WEEU (Reading, PA)
• WFEA (Manchester, NH)
• WGAL (Lancaster, PA)
• WLBZ (Bangor, ME)
• WLW (Cincinnati)
• WKNB (New Britain, CT)
• WORK (York, PA)
• WRAW (Reading, PA)
• WRDO (Augusta, ME)
• WSAN (Allentown)
• WSPD (Toledo)

Midwest affliliates

Basic

• KSD (St. Louis)
• KGIR (Cape Girardeau MO)
• KSTP (St. Paul)
• WDAF (Kansas City)
• WHO (Des Moines)
• WIRE (Indianapolis)
• WMAQ (Chicago)
• WOC (Davenport, IA)
• WOW (Omaha)

Supplemental

• KANS (Wichita, KS)
• KFYR (Bismarck)
• KGBX (Springfield, MO)
• KOAM (Pittsburg, KS)
• KSOO (Sioux Falls)
• WBOW (Terre Haute)
• WCFL (Chicago)
• WCKY (Cincinnati)
• WDAY (Fargo)
• WEBC (Duluth)
• WGBF (Evansville)
• WGL (Fort Wayne)
• WLBA
• WOOD (Grand Rapids)
• WTMJ (Milwaukee)

South affiliates

Basic

• KPRC (Houston)
• WBRC (Birmingham)
• WJDX (Jackson, MS)
• WMBG (Williamsburg, VA)
• WSB (Atlanta)
• WMC (Memphis)
• WDSU (AM) (New Orleans)

Supplemental

• KARK (Little Rock)
• KFDM (Beaumont, TX)
• KGKO (Dallas)
• KGNO (Dodge City, KS)
• KGRV
• KRIS (Corpus Christi, TX)
• KTHS (Hot Springs, AR)
• KTOK (Oklahoma City)
• KTSM (El Paso)
• KVOO (Tulsa)
• WAPO
• WALA (Mobile, AL)
• WAVE (Louisville)
• WBAP (Fort Worth, TX)
• WCSC
• WFAA (Dallas)
• WFBC (Greenville, SC)
• WFLA (Tampa)
• WIOD (Miami)
• WIS (Columbia, SC)
• WJAX (Jacksonville)
• WKY (Oklahoma City)
• WLAK
• WOAI (San Antonio)
• WPTF (Raleigh, NC)
• WROL
• WSM (Nashville)
• WSOC (Charlotte, NC)
• WSUN (Tampa)
• WTAR (Norfolk, VA)
• WWNC (Asheville, NC)

Mountain affiliates

Basic

• KOA (Denver)
• KDYL (Salt Lake City)

Supplemental

• KGHF (Pueblo, CO)
• KGIL
• KIDO (Boise, ID)
• KOB (Albuquerque)
• KPFA
• KSEI (Pocatello, ID)
• KTAR (Phoenix)
• KTFI (Twin Falls, ID)
• KVOA (Tucson)

Pacific affliliates

Basic

• KFI (Los Angeles)
• KCW
• KOMO (Seattle)
• KHQ (Spokane)
• KPO (San Francisco)

Supplemental

• KFBK (Sacramento)
• KWG (Stockton, CA)
• KMJ (Fresno)
• KORN
• KGU (Honolulu)
• KMED (Medford, OR)
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