Laurie Manny, a Long Beach realtor specializing in older homes and historic neighborhoods, has a nice rundown of those neighborhoods / historic districts on her Long Beach Real Estate blog. The directory includes neighborhood boundaries, a survey of historic home styles in the area, general neighborhood description, maps and plenty of photographs. There's also a sort of reverse-directory by house style - for example, if you are looking for a tudor revival home, it'll be in Belmont or California Heights or Bluff Park, but if you want a Streamline Moderne home, it'd be in Bluff or Drake Parks or Wilmore City.

It's nice to see a realtor with a genuine interest in community history!