Westlake, OH has a population of 32,408 and is the 1,311th largest city in the United States. The population density is 2,035 per sq mi which is 690% higher than the Ohio average and 2146% higher than the national average. The median age in Westlake is 47 which is approximately 20% higher than the Ohio average of 39. In Westlake, 64% of the population over 15 years of age are married, 89% speak English and 1% speak Spanish. 73% of Westlake residents were born in Ohio, 19% were born out of state, 1% were born outside of the United States and 8% were foreign born.