Radiogenic age determinations, which involve precise field studies and detailed laboratory analyses, are expensive. Results have been included in many scientific publications, some of which are obscure. The purpose of this report is to make radiometric age determinations for Arizona more accessible to users. we have attempted to assemble all published determinations to collate them and index them to facilitate their use. The determinations are indexed by age, geographic location, and rock unit. The location for each determination is plotted on the accompanying maps. To the best of our knowledge, this is one of the first computerized and cross indexed age compilations of its kind.