Lake Oswego is a city in Clackamas County, Oregon, United States. It is located south of Portland and surrounds the private 405-acre Oswego Lake. As of the 2000 census, the city had a total population of 35,278. The 2006 estimate is 36,350 residents. Lake Oswego apartments for rent comparison page shows most up to date rent information on Lake Oswego apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.