Olympia, WA has a population of 49,608 and is the 826th largest city in the United States. The population density is 2,725 per sq mi which is 2719% higher than the Washington average and 2908% higher than the national average. The median age in Olympia is 38 which is approximately 1% higher than the Washington average of 38. In Olympia, 47% of the population over 15 years of age are married, 87% speak English and 4% speak Spanish. 44% of Olympia residents were born in Washington, 45% were born out of state, 2% were born outside of the United States and 9% were foreign born.