Our state PUC has a set of EAS (Extended Area Service) exchange maps. I don't see one for PA, but maybe you can search for a Norristown directory. Here are the local exchanges and a link to the PA PSC.
http://www.areacodedownload.com/610/index.html
Here's a 610/484 map. I see that they now have 1000's block pooling so you might have to go down to an exact number.
http://www.puc.state.pa.us/telecom/areacode/se_area_code.aspx
Norristown is in Montgomery County btw
Carl
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