Gregg said:
There are about 2 dozen W's west of the Mississippi, mostly explained because the K/W dividing line originally was along the eastern border of New Mexico, Colorado, Wyoming and Montana. There are only 5 K's east of the Mississippi (not counting those in markets like Minneapolis and New Orleans which straddle the Mississippi).
--KDKA and KQV Pittsburgh, which got their call letters in the early 20s before the K/W rules were firmly established. Both stations claim to be the first commercial broadcasting station in the U.S.
--KYW Philadelphia, which also got its call letters in the 20s while in Chicago.
--KFIZ Fond du Lac, Wisc. This one is unexplained unless the FCC confused Fond du Lac, WI with Fond du Lac, Minnesota, a community near Duluth just west of the Mississippi River. The Duluth-Superior market has a mix of W and K call letters.
--KTGG Spring Arbor, Mich. This one is explained by an FCC clerk thinking MI stood for Missouri or Minnesota, not Michigan.
--There was a K call sign temporarily given to a low-power station not yet constructed on Long Island, NY, but it was never used on the air.
According to
http://earlyradiohistory.us/kwtrivia.htm (which I consider the authoratitive source) current K calls on AM east of the Mississippi:
- KSGM-980 Chester, Ill. (moved from Ste. Genevieve, Mo.)
- KFNS-590 Wood River, Ill. (requested by licensee across the river in Missouri; was previously KEZK)
- KTGG-1540 Okemos, Mich. (inadvertently assigned by FCC)
- KDKA-1020 Pittsburgh (licensed during a brief period when *all* stations received four-letter K-calls. 6/20->4/21. No other broadcast station licensed during this period survives.)
- KQV-1410 Pittsburgh (unknown)
- KYW-1060 Philadelphia (unknown. Moved from Chicago and then Cleveland.)
- KWAM-990 Memphis (moved from West Memphis, Ark.; was KWEM)
- KFIZ-1450 Fond du Lac, Wis. (unknown)
I have heard a rumor to the effect KFIZ was licensed as a portable station, starting in a community west of the Mississippi. When the FCC stopped licensing portable stations, some decided to "anchor" themselves wherever they happened to be operating, and kept appropriate calls. WBBZ landed a W call in Oklahoma this way; it was licensed as a portable out of Chicago.
There are more on FM:
- KRLE-91.3 Carbon Hill, Ala. (unknown)
- KPNT-105.7 Collinsville, Ill. (moved from Ste. Genevieve, Mo.)
- KMJM-104.9 Columbia, Ill. (station has always been in Columbia but calls moved from 107.7 St. Louis)
- KUUL-101.3 East Moline, Ill. (swapped calls with 103.7 Davenport, Iowa)
- KMLU-89.3 McKee, Ky. (unknown)
- KOUI-90.7 Louisville, Miss. (unknown)
- KJMS-101.1 Olive Branch, Miss. (moved from West Memphis, Ark.)
- KBUD-102.1 Sardis, Miss. (unknown)
- KFIZ-107.1 Fond du Lac, Wis. (assigned to match AM)
- KUWS-91.3 Superior, Wis. (unknown, but Superior borders on Minnesota)
- KHQG-102.5 Superior, Wis. (see above)
I suspect most of the unknowns are FCC errors...