Riverside is a borough in Northumberland County, Pennsylvania, United States. The population was 1,932 at the 2010 census. The current mayor is John LaMotte.
Welcome sign in Riverside
Northumberland County, Pennsylvania
Northumberland County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 91,647. Its county seat is Sunbury. The county is part of the Central Pennsylvania region of the state.
Northumberland County Courthouse
Susquehanna River from the Shikellamy State Park overlook, looking upriver. The West Branch Susquehanna River is in the foreground.
View looking northeast from the Shikellamy State Park overlook