Bothell, WA has a population of 43,153 and is the 951st largest city in the United States. The population density is 3,159 per sq mi which is 3168% higher than the Washington average and 3387% higher than the national average. The median age in Bothell is 38 which is approximately equal to the Washington average of 38. In Bothell, 60% of the population over 15 years of age are married, 77% speak English and 6% speak Spanish. 46% of Bothell residents were born in Washington, 33% were born out of state, 2% were born outside of the United States and 19% were foreign born.