Data from the U.S. Census Bureau reveals that 641,000 Oklahoman under the age of 65 were without health insurance coverage in 2006-07, which is more than one out of every five non-elderly Oklahomans. This fact sheet from OK Policy looks at trends in health insurance coverage in Oklahoma between 1999-2000 and 2006-2007, looking especially at sources of coverage and differences in cverage patterns between children and adults.