Jefferson is a city in Marion County, Oregon, United States. It is part of the Salem Metropolitan Statistical Area. The population was 2,487 at the 2000 census. It is home to the annual Mint Harvest Festival and is the self-proclaimed "Mint Capital of the World" as well as "Frog Jumping Capital of Oregon".
According to the United States Census Bureau, the city has a total area of 0.8 square miles (1.9 km²), of which, 0.7 square miles (1.9 km²) of it is land and 1.33% is water.
As of the census of 2000, there were 2,487 people, 817 households, and 643 families residing in the city. The population density was 3,389.3 people per square mile (1,315.4/km²). There were 885 housing units at an average density of 1,206.1 per square mile (468.1/km²). The racial makeup of the city was 81.83% White, 0.36% African American, 1.89% Native American, 0.76% Asian, 0.04% Pacific Islander, 11.66% from other races, and 3.46% from two or more races. Hispanic or Latino of any race were 20.67% of the population.