People QuickFacts Thurston County Washington Population, 2008 estimate 245,181 6,549,224 Population, percent change, April 1, 2000 to July 1, 2008 18.20% 11.10% Population estimates base (April 1) 2000 207,353 5,894,143 Persons under 5 years old, percent, 2007 5.90% 6.50% Persons under 18 years old, percent, 2007 22.30% 23.80% Persons 65 years old and over, percent, 2007 12.30% 11.70% Female ... »