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ContextPrevious studies have reported that the number and distribution of trauma centers are uneven across states, suggesting large differences in access to trauma center care.ObjectiveTo estimate the proportion of US residents having access to trauma centers within 45 and 60 minutes.Design and SettingCross-sectional study using data from 2 national databases as part of the Trauma Resource Allocation Model for Ambulances and Hospitals (TRAMAH) project. Trauma centers, base helipads, and block group population were counted for all 50 states and the District of Columbia as of January 2005.Main Outcome MeasuresPercentages of national, regional, and state populations having access to all 703 level I, II, and III trauma centers in the United States by either ground ambulance or helicopter within 45 and 60 minutes.ResultsAn estimated 69.2% and 84.1% of all US residents had access to a level I or II …