 Denver radio station 850 KOA, which broadcasts a news/talk and sports format, operates its 50,000 watt transmitter from a site 10 miles northeast of downtown Castle Rock, in the town of Parker.Another Denver station, KEZW "EZ 1430", a CNN affiliate with a nostalgia music format, operates its transmitter from Highlands Ranch, 13 miles north of downtown Castle Rock.NPR programming can be heard on Colorado Public Radio's KCFR-FM.