KOOL

There are many, many stations that are known as "KOOL" but only one possesses the actual KOOL call letters.  "KOOL 94.5" (now slightly re-branded as "94.5 KOOL FM") plays Classic Hits in Phoenix, Arizona.  For many years they were a traditional Oldies station.  In fact, their Wikipedia entry claims that they were the first station to ever carry the format when they switched to all-Oldies in 1971.  The vintage top sticker was from when KOOL had a sister station at 960 AM which carried the KOOL calls from 1947 to 1979 and again from 1983 to 1996.  960 AM is currently News/Talk KKNT "The Patriot."

KDKA

Keychains and a magnet from the world's first commercially licensed radio station, KDKA in Pittsburgh, Pennsylvania.  "Newsradio 1020" broadcasts with 50,000-watts on a clear channel frequency and has been on the air since 1920.
KDKA stickers can be seen here.

WCXR

WCXR played Classic Rock in Washington, DC from 1986 until 1994.  105.9 FM, licensed to Woodbridge, Virginia, is currently WMAL and carries a News/Talk format.

Happy St. Patrick's Day! / WIXV

A shirt from Rock station WIXV "I-95" in Savannah, Georgia.  Their branding refers to Interstate 95 which runs parallel to Georgia's Atlantic Ocean coastline.  The IX and V of the station's call letters are the Roman numerals for 9 and 5.

KSCS

96.3 KSCS is a Country-formatted station in Dallas, Texas and licensed to Fort Worth.  Other KSCS stuff can be seen here.

KBZN

Salt Lake City, Utah's KBZN was a Smooth Jazz outlet, "97.9 The Breeze," from 1990 until 2008.

The frequency is currently a Hot AC station "Now 97.9."  KBZN is licensed to Ogden, UT

WGRV

WGRV "105.1 The Groove" played Urban Oldies in Detroit, Michigan from April, 1999 until June, 2001.  The format was also known as Jammin' Oldies or Classic Soul and enjoyed a brief period of popularity at the time.  The frequency is currently home to "Detroit Sports 105.1"

KCXX

"X103.9" KCXX is an Alternative Rock station licensed to Lake Arrowhead, California which is in the Riverside/San Bernardino radio market (#26) 

KRLD

KRLD has been broadcasting in Dallas, Texas since Halloween Day, 1926.  Dallas Radio Laboratories originally owned the station but the call letters KDRL were already taken so they changed the name of the business to Radio Laboratories of Dallas and became KRLD instead.  Sports were a major part of their programming--they were the flagship station of the Dallas Cowboys in the 1970s and 80s and were the home of the Texas Rangers from 1995 to 2011.  KRLD boasts many firsts in the radio industry:
--The first station to broadcast live high school and college sports.
--The first to report continuous election returns.
--The first to broadcast "live" music and entertainment programs
--and the first station in the world to sell commercials.
KRLD is all-News from 5AM to 8PM with Talk programming at night and weekends.

WNEK

105.1 FM WNEK is a 13-watt college broadcaster from Western New England University in Springfield, Massachusetts.  They went on the air in 1976 and have also broadcast at 89.1, 97.5 and 99.7 FM over the course of their history.

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WXTL

WXTL "105.9 The Rebel" plays Classic Rock in Syracuse, New York

KOY

Phoenix's KOY is the oldest radio station in Arizona dating back to 1921 when experimental station 6BBH went on the air.  Call letter changes to KDYM and KFCB followed and they became KOY in 1929, located at 1390 AM on the dial.  An almost 60 year run at 550 AM began around 1940 and lasted until 1999 when they switched to their current location at 1230 AM.  KOY's current Business News format is branded as "KFYI."  550 AM currently carries the actual KFYI call letters and carries a News/Talk format.  The groovy, 1970s/early 80s-era logo of the top sticker dates to when KOY probably had a Middle-of-the-Road format.

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KLAK

KLAK "97.5 K-LAKE" is an Adult Contemporary outlet licensed to Tom Bean, Texas.  The station's branding refers to Lake Texoma, an 89,000-acre body of water straddling the border of Texas and Oklahoma.

WSJS

AM 600 WSJS is a News/Talk station in Winston-Salem, North Carolina.  The call letters originate from Winston-Salem Journal Sentinal which was a combination of the names of two daily newspapers in print at the time the station went on the air in 1930.  The "Deacon" in the top sticker refers to the mascot of Wake Forest University whose basketball and football games were heard on WSJS for more than 20 years.

WUSZ

WUSZ "Radio USA" is a Country station licensed to Virginia, Minnesota.

WPRK

Stickers and postcard from 91.5 WPRK which broadcasts from Rollins College in Winter PaRK, Florida.  WPRK went on the air on December 8, 1952 and was given a dedication address by then President-Elect Dwight D. Eisenhower.  Notable WPRK alumni include SiriusXM's Chris "Mad Dog" Russo and DJ/producer Diplo.

CHYR

CHYR "Mix 96.7" is a Hot Adult Contemporary station licensed to Leamington, Ontario.  They began in 1955 as a 250-watt daytimer at 710 AM with call letters CJSP.  The CHYR calls began in 1967 and for a time they broadcast on 710 AM during the day and 730 AM at night.  Channel 7 "Cheer Radio" at the time was a Top-40 station and in the early 1990s flipped to Country.  CHYR moved to 96.7 FM in 1993.

4BU

1332 AM 4BU plays Classic Hits in Bundaberg, Queensland, Australia.  They went on the air in December, 1935.

KMJR

KMJR "La Mejor 93.5" was a Spanish-language station licensed to Redondo Beach, California.  The frequency is now home to Hip-Hop station KDAY.

KLHB

Corpus Christi, Texas's KLHB has carried a variety of formats over the years on two different frequencies.  Spanish Oldies, Sports as an ESPN affiliate, Spanish CHR as "Exitos 105.5" and Tejano as "Club 98.3".  A sticker from their current format as a Rhythmic CHR station "Wild 105.5" can be seen here.