Friendly staff help with building, plumbing and mechanical permits; planning, zoning and land-use regulations; septic systems, wells and water testing. In response to Governor Inslee's Stay Home, Stay Healthy Order and Safe Start Plan, Thurston County continues to operate under an essential services model.This is in effect until Thurston County enters Phase 3 of the Safe Start Plan. In response to Governor Inslee's Stay Home, Stay Healthy Order and Safe Start Plan, Thurston County continues to operate under an essential services model.This is in effect until Thurston County enters Phase 3 of the Safe Start Plan. Thurston is a leading provider of premium quality modular buildings and portable buildings for use in every industry and market sector, including health, education, transport, construction, defence, and telecommunications. Public Access is Closed to MOST County Facilities Due to COVID-19. Thurston County Courthouse Complex, Building 1, 2nd Floor 2000 Lakeridge Drive SW (map & directions) | 360-786-5490 . On May 27, Thurston County received approval from the State Department of Health to move into Phase 2 of the Safe Start Recovery Plan. There are 6 Building Departments in Thurston County, Washington, serving a population of 269,885 people in an area of 722 square miles.There is 1 Building Department per 44,980 people, and 1 Building Department per 120 square miles.. On May 27, the Thurston County Health Officer issued a directive requiring individuals to wear face coverings, effective Tuesday, May 28, 2020.. For the most updated, daily case numbers, visit the PHSS COVID-19 data page. Public Access is Closed to MOST County Facilities Due to COVID-19. In Washington, Thurston County is ranked 28th of 39 counties in Building Departments per capita, and 4th of 39 counties in Building Departments per square mile.