Kadam, I know what you mean -- I'm from Iowa originally so obviously have some ties to the sport
Here's a great club my son belonged to in Mount Laurel;
Wrecking Crew Wrestling
One of my buddies volunteer coached there and the middle school (Harrington)nearby -- and they were very grateful to have him.
Harrington News
Knock off the harrington part on that site and it takes you to the Lenape HS program which is also very active, though I don't remember seeing any "volunteer" coaches, I'm sure they'd welcome some help -- pretty big team.
Good luck in your search. Don't think it'll be too hard to find a place.
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