Not much has been said for Seattle's KXRX, but it was a trailblazer.
When they signed on in January 1987, they weren't "96 point 5" KXRX. They were "96-Dot-5" KXRX. Other FM stations (and later, websites) would incorporate this into their identities. Correct me if I'm wrong, but I still know of no other FM radio station prior to KXRX that has ever used this before.
They had a TON of personality, mostly from KISW, whom they departed when Nationwide Insurance bought the station. And a salty, station-effacing humorous voice-over announcer. Plus a much wider playlist than KISW.
It took a few years for KISW to recover from the blow.
There's also KISM in Bellingham, WA in the early '80s. KISM flipped to modern rock in 1982, then morphed into CHR for the remainder of the '80s. In the early '90s, they tried a AAA experiment called "Independent Rock 92.9", which is still fondly remembered in Northwest Washington. KISM would be bought by Saga Communications and given the most GENERIC and TIGHTEST classic rock playlist I have ever heard. Which unfortunately, it's still running.
CFOX 99.3 in Vancouver was an awesome station. So was CFMI 101.1
On AM, Seattle had KJET 1600 (actually 1590). Not an AOR, but in the earlier days of the station, it wasn't uncommon to hear "Destroyer' The Kinks or a Stones song. KJET and KZAM 1540 were Seattle's ONLY commercial alternative rock stations until 1988 when KJET gave up the ghost. Vancouver had CKXY 1040 and CHRX 600. Another one was KILO 1460 out of Kirkland, WA in the '70s.