An audience matching system (“system”) maintains a plurality of audience polygons that enclose respective geographic regions and are associated with respective time periods, and respective target audiences. The system receives an advertisement request from a remote display system having a display at a particular geographic location, the request including an advertisement parameter that identifies a first target time period. The system selects a first audience polygon from the plurality of audience polygons, the selecting based in part on a geographic region associated with the first audience polygon enclosing the geographic location of the display and a time period associated with the first audience polygon being inclusive of the first target time period. The system determines a first target audience using the first audience polygon, and selects an advertisement associated with the first target audience. The system provides the advertisement to the remote display system.