Were the two 1982 Spielberg movies E.T. and Poltergeist filmed in the same neighborhood? They were both filmed in tract housing developments during the same year. Were they filmed in the same place in succession?
No, they are not the same place.
According to this site, Poltergeist was filmed in Agoura Hills.
Another page on the same site indicates that the street where they take off on the bike (I assume that's the one you're thinking of) is filmed in Granada Hills.
As a semi-related piece of trivia I found on that same site, in the Charlie's Angel's remake starring Drew Barrymore, there's a scene where she rolls into the villain's backyard, and the house is the same one she and Eliot lived in in E.T.