In Western Pennsylvania, the suburbs of PA in Butler and the suburbs in Washington. In Allegheny, I'd say that West Deer, Pine Richland, North Fayette, and Jefferson Hills (the areas east are more like the rest of the areas in the Mononghala which are economically devastated than Jefferson Hills/"suburban areas") are the "solidly Republican" suburbs although there are plenty of staunch Republicans in the more swingier suburbs.
Asides Beaver County, Trump did crack 60% in Washington, Westmoreland, and Butler counties however when looking at townships and towns themselves, he generally got in 50s in the more suburban ones near the border with Allegheny County. Got over 60% due to bigger wins in the townships further out which tend to be more rural.
Even in the precincts which border Allegheny County, the Republican precincts border on 60% Republican and you can tell that the suburbs are Republican - for instance you can tell that they are MAGA country even compared to suburbs that vote Republican in Allegheny County.
