El Dorado County Assessor - Jon DeVille Share: Government El Dorado County Assessor - Jon DeVille Visit Website Request Info 3987 Missouri Flat Road Suite 340, Box 426 Placerville , CA 95667 (530) 681-0283 Facebook About Map About I am a longtime resident of El Dorado County committed to conducting fair and impartial property assessments. I will also be focusing on protecting Prop 13 & enhancing transparency/customer service. What's Nearby? Distance: 5 10 15 20 25 50 mi.