The Seattle Streetcar is a system of two modern streetcar lines operating in the city of Seattle, Washington. The South Lake Union line opened first in 2007 and was followed by the First Hill line in 2016. The two lines are unconnected, but share similar characteristics: frequent service, station amenities, and vehicles. Streetcars typically arrive every 10–15 minutes most of the day, except late at night. The streetcar lines are owned by the Seattle Department of Transportation and operated by King County Metro. The system carried 1,326,500 passengers in 2023.