Oldtown is a town in Bonner County, Idaho and suburb of Newport, Washington, with a population of 184 at the 2010 census. It is located on the Pend Oreille River, just east of Newport. There are no natural or physical barriers, and it is strictly a political division, separated by the straight-line state boundary. Oldtown is squeezed between this boundary to the west and the river to the east, leaving the main business district on U.S. Route 2 with only 700 feet (200 meters) of space in which to operate on the Idaho side. Many homes are located in the south end on the other side of the railroad, as the Pend Oreille is somewhat further away here.
Originally named Newport, Idaho, the town gradually dwindled, and was renamed and incorporated as "Oldtown" in 1947. In October 2003, a 51-year-old man killed four people at Stateline Tavern in Oldtown, and then committed suicide.
Oldtown is located at 48°11′8″N 117°1′49″W (48.185623, -117.030158), at an elevation of 2,134 feet (650 meters).
According to the United States Census Bureau, the city has a total area of 0.83 square miles (2.15 km2), of which, 0.82 square miles (2.12 km2) is land and 0.01 square miles (0.03 km2) is water.
At the 2010 census there were 184 people in 80 households, including 47 families, in the city. The population density was 224.4 inhabitants per square mile (86.6/km2). There were 109 housing units at an average density of 132.9 per square mile (51.3/km2).