American Public Transit Association: An international organization for the bus, rapid transit and commuter rail systems industry, based in Washington, DC. Extensive directory of transit systems in the United States.
ATC Public Transportation: Fixed route and paratransit operations and management services throughout the country.
Federal Transit Administration: Compiles statistics and makes recommendations for U.S. mass transit.
New England Public Transit Resources: Information about public transportation in Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont. Includes operator listing and served areas.
NJ Transit / PATH / New York City Subway Information: Includes New Jersey Transit schedules and station information, subway station and line information, subway directions, and information about all three New York City area systems.
South West Transit Association: Trade association for public transit agencies in Arkansas, Arizona, Kansas, Louisiana, New Mexico, Oklahoma, and Texas.