Funny, other than the Big 3, it seems there's a specific reason that I knew the ones that I did.
Ketchikan - have friends from there
Kodiak - awed to see a Kodiak bear at a zoo I was a kid
Unalaska - once you see this name, you don't forget it
Seward - Seward's Folly
Valdez - Exxon Valdez oil spill
North Pole - again, once you see it...
Barrow - northernmost U.S. city