Methods, systems, and apparatus for populating a least cost routing database. In one aspect, a method includes receiving from a carrier a bid for routing a telephone call to a destination; automatically loading the received bid into a least cost routing database to generate an updated least cost routing database; and making the updated least cost routing database accessible for use in determining one or more least cost routes. Further, the received bid can be analyzed to generate a projected business result and the projected business result can be presented to the carrier before loading the received bid into the least cost routing database. Additionally, input can be received from the carrier specifying an historical period and the projected business result can be generated based on data associated with the specified historical period.