Blaine is a city in Whatcom County, Washington, United States. The city's northern boundary is the Canada–US border. Blaine is the shared home of the Peace Arch international monument. The population was 4,684 at the 2010 census. Since Blaine is located right on the border with Canada, it is the northernmost city on Interstate 5, while the southernmost city is San Ysidro, California.HistoryThe area was first settled in the mid-19th century by pioneers who established the town as a seaport for the west coast logging and fishing industries, and as a jumping off point for prospectors heading to British Columbia's gold fields. Blaine was officially incorporated on May 20, 1890, and was named after James G. Blaine (1830−1893), who was a U.S. senator from the state of Maine, Secretary of State, and, in 1884, the unsuccessful Republican presidential candidate. The city has a "turn-of-the-century" theme, marked by remodeled buildings and signs resembling designs that existed during the late 19th century and early 20th century.