A system and method for determining billable transmission network usage for transmitting a broadcast message to a plurality of broadcast message receiving devices located within a broadcast target area by a broadcast transmission network serving a network serving area with a plurality of network transmission elements each serving a network element portion of the network serving area including determining the network transmission elements having network element serving area portions that serve at least a portion of the received broadcast target area, determining network element serving areas, determining a density of broadcast receiving devices, and generating over an output data interface an incurred network usage record for the broadcast message record as a function of the determined density and the network element broadcast area served.