There are more than those two in Philadelphia. Those are just the ones talked about on this board (I have enjoyed meals at both, as well as Almaz and I have heard good things about Kaffa Crossing). Below is what I pulled from philadelphia menupages. I don't know about Ethiopian restaurants in the burbs.
229 S 45th St | At Locust St
140 S 20th St | At Moravian St
4708 Baltimore Ave | At S 47th St
5547 Germantown Ave | Btwn E Armat St & E School House Ln
2743 Poplar St | Btwn N 27th St & N 28th St
4540 Baltimore Ave | Btwn S 45th St & S 46th St
4423 Chestnut St | Btwn S 44th & S 45th St