I went to google and typed in...
pennsylvania law how many chickens
I came up with chickenlaws.html that has the following Pennsylvania's chicken laws...
Catawissa, PA. Chickens must be confined, no closer than 10 feet from neighboring properties, kept clean with no odors emanating across property lines.
Lancaster, PA: No livestock or poultry can be kept within city limits
Pittsburgh, PA. "Fowl at large” are not permitted in unenclosed areas, other peoples' property, or public lands. Also, “no more than 5 pets per household" city limit and animal nuisance prohibitions as well.
State College, PA. As of 2008, this town is considering an ordinance that would allow borough residents to raise up to four hens in backyard coops, provided a strict series of health and zoning controls are met. Legal to raise chickens provided they are housed “under sanitary conditions" and that they "shall not become either a public or private nuisance." No mention of numbers restrictions. Keeping chickens in College Township in residential areas is not permitted.
Shaler, PA. You can't keep game cocks. It appears keeping hens is allowed.
If this doesn't help, I would suggest maybe calling the Humane Society in your area.