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The 2016 Lake Oswego, Oregon, population is 38,496. There are 3,601 people per square mile (population density).
The US median is 37.4. 61.04% of people in Lake Oswego, Oregon, are married. 11.96% are divorced. The average household size is 2.32 people. 36.91% of people are married, with children. 8.44% have children, but are single.