A modular wireway which is adapted to be utilized with easily mountable, demountable and remountable attachments includes an elongate member which is mountable to a support surface and at least one connector which is adapted for mating with a connector on a removably attachable cable management trough or a removably attachable modesty panel, or both. The disclosed elongate member has a generally I-shaped transverse cross-section and includes an upper horizontal flange member configured to be mounted on a support bracket secured to a support surface, a web which depends from the upper horizontal flange member, and a lower attachment flange connected to the lower end of the web. The attachment flange includes one or more connectors which allow attachment of one or more removable closures which together with the elongate member define an enclosed raceway, a rigidly connected auxiliary cable management trough, a hingedly connected cable management trough, and/or a modesty panel. The modular wireway invention allows furniture and the like to be quickly and easily configured and reconfigured as desired to provide powerways and auxiliary wireways for communication cables.