Because of the scale of damage, many people resettled permanently outside the area. Federal, state, and local efforts supported recovery and rebuilding in severely damaged neighborhoods. The Census Bureau in July 2006 estimated the population to be 223,000; a subsequent study estimated that 32,000 additional residents had moved to the city as of March 2007, bringing the estimated population to 255,000, approximately 56% of the pre-Katrina population level. Another estimate, based on utility usage from July 2007, estimated the population to be approximately 274,000 or 60% of the pre-Katrina population. These estimates are somewhat smaller to a third estimate, based on mail delivery records, from the Greater New Orleans Community Data Center in June 2007, which indicated that the city had regained approximately two-thirds of its pre-Katrina population. In 2008, the Census Bureau revised its population estimate for the city upward, to 336,644. Most recently, by July 2015, the population was back up to 386,617—80% of what it was in 2000.