Metro Transit:  find maps, timetables, and fare information for the  public transportation system for the St. Louis metropolitan region, including services for  MetroLinkMetroBus and Metro Call-A-Ride.
Citizens for Modern Transit: pushing for an integrated, affordable, and convenient public transportation system in the St. Louis area, CMT offers many employer and commuter transit programs including the Guaranteed Ride Home program.
Madison County Transit: MCT provides the Madison County community with numerous public bus routes, a Paratransit service for the disabled and elderly, bikeway development, as well as overseeing RideFinders, the St. Louis regional rideshare program.
Amtrak: The National Railroad Passenger Corporation (Amtrak) offers rail passenger service from St. Louis to destinations all across the US. Their website offers maps, timetables, and fare information.
Greyhound: the largest provider of intercity bus transportation in North America.  Their website offers maps, timetables, and fare information.