WFON

A plastic keychain tag from "Music 107" WFON in (W) FONd du Lac, Wisconsin.  My guess is that they were a Top-40 or Adult Contemporary station circa the late 1980s.  If you know for sure, leave a comment.
As of this posting, WFON carries a Country format as "107.1 The Bull."

CJRT

91.1 FM CJRT (C Journalism, Radio, Technology) is a full-time Jazz station in Toronto, Ontario.  They originally went on the air in 1949 as an educational radio station for students at what is now Ryerson University.

WEBC

560 AM WEBC is a Sports station in Duluth, Minnesota currently branded as "Northland Fan."

KNEN

94.7 FM KNEN is a Classic Rock station in Norfolk, Nebraska.

WSPK

"K104.7" WSPK (W Stereo PoughKeepsie) is a Top-40 station in Poughkeepsie, New York.  These stickers might be from WSPK too.

RTL

RTL (Radio Television Luxembourg) is an international media company based in Kirchberg, Luxembourg.  They operate radio stations in multiple countries including Germany, France, Belgium and Spain.  These stickers may or may not be exclusively from RTL operations in Luxembourg--it's hard to tell when they all use the same logo.

Bayrak FM

Bayrak FM ("Flag" FM) broadcasts from North Nicosia to the self-proclaimed Turkish Republic of Northern Cyprus.  They are one of five radio stations operated by the Bayrak Radio and Television Corporation which was originally established in 1963 to voice the cause of Turkish Cypriot nationalists.  The sticker depicts the flags of Turkey and the Turkish Republic of Northern Cyprus which is not officially recognized as a country by the Republic of Cyprus, the United States or the United Nations.

Rumba 107.1

"Rumba 107.1" was a short-lived Spanish CHR station broadcasting for parts of 2002 and 2003.  They were actually a quadcast airing on four different suburban stations surrounding New York City:
WYNY - Briarcliff Manor, New York
WWZY - Long Branch, New Jersey
WWYY - Belvidere, New Jersey and
WWXY - Hampton Bays, New York
Despite the NYC skyline shown on the sticker, their signals to the metro area were weak and unable to be easily heard by their target audience--urban-dwelling Hispanics. 

WQWM

1050 AM WQWM was an Oldies station licensed to Kaukauna, Wisconsin from 1984 until 1993.  The call letters referred to the owner, a Milwaukee attorney named Quinn Martin.

WMYK

According to Wikipedia, WMYK "K-94" signed on the air in 1973 with an AOR/Top-40 format.  The logo on the above sticker dates to when they shifted to New Wave/Modern Rock around 1982.  WMYK broadcast to the Norfolk/Chesapeake area of Virginia and was licensed to (W) MoYocK, North Carolina.

At one time WMYK was simulcast with sister station 1110 AM WZAM in Norfolk, Virginia.

WJZM

1400 AM WJZM was on the air in Clarksville, Tennessee from 1941 until 2018.

WEZQ

1300 AM WEZQ was a Country music station in Winfield, Alabama from 1965 until 1990.  After multiple ownership changes, the station (then with call letters WKXM) went silent in 2013 and had its license canceled by the FCC the following year.

KTJM

103.3 FM KTJM was a Rhythmic Oldies station in Houston, Texas from 1999 until 2001.  As of this post, the KTJM call letters are still around although now with a Regional Mexican format branded as "La Raza."  KTJM is licensed to Port Arthur, TX.

KIXW

KIXW is a Talk station licensed to Apple Valley, California.

CIOO

CIOO "C100" is a Hot Adult Contemporary station in Halifax, Nova Scotia.

KFMX

94.5 FM KFMX has been a Rock station in Lubbock, Texas since the early 1980s.

CJUK

CJUK went on the air in Thunder Bay, Ontario in August 2001.  They were an Adult Contemporary (and later Hot AC) station branded as "Magic 99.9" and currently play Classic Hits as "99.9 The Bay."

BBC Radio Cambridgeshire

BBC Radio Cambridgeshire went on the air in Cambridge, England in May 1982.  This decal showcases an original "sun and clouds" logo that existed before the British Broadcasting Corporation mandated that all of its stations should have a joint logo to underline the national nature of their local radio services.

WGTK

WGTK "94.5 The Answer" is a News/Talk station in Greenville, South Carolina.

WQYZ

A bookmark from WQYZ "Hallelujah 92.5" which was a Gospel station licensed to Ocean Springs, Mississippi.