Jefferson is a city in Marion County, Oregon, United States. It is ration of the Salem Metropolitan Statistical Area. The population was 3,098 at the 2010 census. It is house to the annual Mint Harvest Festival and is the self-proclaimed “Mint Capital of the World” as skillfully as “Frog Jumping Capital of Oregon.” The city sits upon the right bank of the Santiam River together with Salem and Albany along Oregon Route 164 east of Interstate 5.

The first proclaim for this locality was Conser’s Ferry, for Jacob S. Conser, an Oregon Trail swashbuckler of 1848 who ran a ferry across the Santiam River. Conser was also in force in the communities of Syracuse and Santiam City, which was roughly 2 miles (3 km) downstream of Jefferson. He usual the ferry in 1851, and as a consequence served as the postmaster of Santiam City. When the Jefferson Institute was conventional in the vicinity (not the thesame as the Jefferson Institute in Polk County), the declare Jefferson was eventually adopted by the community. Jefferson reveal office was received in 1861, with a name correct from Syracuse, and previously, Santiam City.

In 1974, the Jacob Conser House was listed on the National Register of Historic Places (NRHP), which served as the city’s library until 2018. The current Oregon Route 164 bridge across the Santiam was expected by Conde McCullough and named in Conser’s honor. The Jefferson Methodist Church was added to the NRHP in 1980. In 2017, voters recalled mayor Cyndie Hightower, and three city council members resigned higher than issues joined to the annexation of estate into the city.

According to the United States Census Bureau, the city has a total Place of 0.77 square miles (1.99 km), of which, 0.76 square miles (1.97 km²) is house and 0.01 square miles (0.03 km) is water.