The document discusses population mobility patterns in the United States based on Census Bureau data. It finds that over 40 million Americans moved in 2002-2003, with over half being local moves within counties. Younger adults aged 20-29 had the highest moving rates, while older adults aged 55+ had the highest rates of interstate moves. Hispanics and African Americans also had above average moving rates. Factors like age and home ownership most influenced rates of relocation.