This document analyzes trends in obesity among US adults between 1985 and 2009 based on data from the Behavioral Risk Factor Surveillance System. It finds that in 1990, most states had obesity prevalence below 10%, while by 1999 no state was below 10% and by 2009 only one state and DC were below 20%, with 33 states at or above 25% prevalence. Nine southern states had reached or exceeded 30% prevalence by 2009, indicating a clear rise in obesity levels across the US during this period.