IRS
Web Site: http://www.irs.gov
Live Telephone Assistance: 1-800-829-1040
Live Telephone Assistance for Businesses: 1 800-829-4933

DC Office of Tax and Revenue
Web Site: http://cfo.dc.gov/otr/site/default.asp
Citywide Call Center : 202-727-1000

Comptroller of Maryland
Web Site: http://www.comp.state.md.us

Virginia Department of Taxation
Web Site: http://www.tax.virginia.gov//
Customer Service: 804-367-8031
Business Customer Service: 804-367-8037

Pennsylvania Department of Revenue
Web Site: http://www.revenue.state.pa.us/
FACT line: 1-888-PATAXES (1-888-728-2937)
Personal Income Tax: 717-787-8201
Business Tax: 717-787-1064
Taxpayers with special hearing and/or speaking needsl: 1-800-447-3020 (TT Only).