The
40k scene in the Lehigh Valley these days has dropped dramatically since the onset of Warmachine/Hordes and Games' Workshop's pricing overhaul/ending of tournament support. The only places I'm aware of that have
40k activity in the Greater Lehigh Valley are
Hobbytown USA on Saturdays from 3/4 until close,
The Portal Comics & Gaming in Bethlehem, on Wednesday evenings, and
Dragon Head Gaming (at the Merchant Square Mall) in lower Allentown. Dragon Head has players there on a day I don't quit remember at the moment. You'll have to go in and talk with the owner.
Of the three locations I listed, Hobbytown USA is the only one with a large group of players who show up on a fairly regular basis.
The Portal feels more like a gaming shop,
IMO, and has a great atmosphere and selection of available models, given its limited space. People tend to be very friendly there, as well.
Dragon Head Gaming has a lot of space and great tables/terrain, and I'm sure there's a number of players there.
If you're willing to take a drive, it might be worth checking out
Stomping Grounds Games and Hobbies (their site) down in Warminster/Horsham. This is where I've done most of my tabletop gaming overall; everyone's very friendly and approachable (and I have a natural timidness that makes me unable to speak to people when I get nervous. I can usually speak freely here). Unfortunately, it
is a good hour or so drive from here.
Someone really needs to set up a Facebook group for the Greater Lehigh Valley for
40k players. There's one for Warmachine & Hordes. It would make us setting up games together a lot easier.