 About 3.4% of families and 4.8% of the population were below the poverty line, including 5.5% of those under age 18 and 4.7% of those age 65 or over.Issaquah is bisected by Interstate 90, which runs from Seattle to Boston, and Washington State Route 900, which connects the city to neighboring Renton.There is a chronic traffic congestion problem on Front Street, which traverses the historic downtown.