Thurston County: Health insurance coverage Note: Due to rounding by the Census Bureau, the sum of the county estimates within a state may not equal the state estimate and the sum of the state estimates may not equal the national estimate. Source: 2005 - 2019: U.S. Bureau of the Census, Small Area Health Insurance Estimates, (https://www.census.gov/data-tools/demo/sahie/#/); DATE LAST UPDATED: September 27, 2021.