Washington Metropolitan Area Transit Authority Washington Metropolitan Area Transit Authority Search | Advanced Search | New Members | Coupons and Discounts | All Categories Advertising & Media >> Transportation Washington Metropolitan Area Transit Authority 307 7th Street, NWWashington, DC 20024 | View on Google Maps Regina Sullivan (202) 962-2500 | fax: (202) 962-1409 Visit Site Connect With Us Operator of regional Metrorail and Metrobus systems serving 1,000,000 trips each weekday. Member Since: 2013