Columbia City is a neighborhood in southeastern Seattle, Washington, within the city's Rainier Valley district. It has a landmark-protected historic business district and is one of the few Seattle neighborhoods with a long history of ethnic and income diversity. The neighborhood's main thoroughfares running north–south are Rainier Avenue S. and Martin Luther King Jr. Way S. The principal east–west thoroughfares are S. Alaska Street, S Orcas Street, and S. Genesee Street.