The exchanges we used often enough for me to remember were GEneral, HAmilton, LIncoln, MYrtle, and OVerbrook. Using the letters started fading away for me in the early 70’s. I sometimes still give my present number that way to mess with kids.
We referred to it as either “Edgewater” or “Eee Dee,” but the digit “5” always followed, then 4 more digits.