An apparatus to determine a type of a media device that presented media, the apparatus comprising means for: receiving media identifying information, wherein the media identifying information comprises an identifier that identifies media detected by a media meter (124, 142, 152) at a first media location; responsive to determining that the media identifying information identifies the type of the media device that presented the media detected by the media meter: determining the type of the media device that presented the media with the media identifying information; responsive to determining that the media identifying information does not identify the type of the media device (102, 104, 106, 108) that presented the media detected by the media meter: generating a cluster of media locations from a reference population of media locations based on the media identifying information, wherein generating the cluster of media locations comprises identifying one or more media locations from the reference population of media locations that received media identifiers matching the identifier included in the media identifying information; determining media devices available at the media locations in the cluster of media locations; determining the type of the media device that presented the media based on determining a type of a media device, from the media devices available at the media locations in the cluster of media locations, which is determined to be available in a majority of media locations in the cluster of media locations; and generating a report indicating the determined type of the media device that presented the media. receiving media identifying information, wherein the media identifying information comprises an identifier that identifies media detected by a media meter (124, 142, 152) at a first media location; responsive to determining that the media identifying information identifies the type of the media device that presented the media detected by the media meter: determining the type of the media device that presented the media with the media identifying information; responsive to determining that the media identifying information does not identify the type of the media device (102, 104, 106, 108) that presented the media detected by the media meter: generating a cluster of media locations from a reference population of media locations based on the media identifying information, wherein generating the cluster of media locations comprises identifying one or more media locations from the reference population of media locations that received media identifiers matching the identifier included in the media identifying information; determining media devices available at the media locations in the cluster of media locations; determining the type of the media device that presented the media based on determining a type of a media device, from the media devices available at the media locations in the cluster of media locations, which is determined to be available in a majority of media locations in the cluster of media locations; and generating a cluster of media locations from a reference population of media locations based on the media identifying information, wherein generating the cluster of media locations comprises identifying one or more media locations from the reference population of media locations that received media identifiers matching the identifier included in the media identifying information; determining media devices available at the media locations in the cluster of media locations; determining the type of the media device that presented the media based on determining a type of a media device, from the media devices available at the media locations in the cluster of media locations, which is determined to be available in a majority of media locations in the cluster of media locations; and generating a report indicating the determined type of the media device that presented the media.