Federal
http://www.irs.gov
http://www.ssa.gov
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Pennsylvania
Dept of Revenue
http://www.revenue.state.pa.us

Dept of Labor
http://www.dli.state.pa.us
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New Jersey
Dept of Revenue
http://www.state.nj.us/treasury/revenue

Dept of Labor
http://lwd.state.nj.us/labor
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Delaware
Dept of Revenue
http://revenue.delaware.gov

Dept of Labor
http://www.delawareworks.com/
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Philadelphia
http://www.phila.gov
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Berkheimer
http://www.hab-inc.com
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Central Tax Bureau
http://www.centaxgroup.com
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PA Municipal Statistics Tax Reports
http://munstatspa.dced.state.pa.us/Registers.aspx
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American Payroll Association
http://www.americanpayroll.org/weblink/statelocal/