Marion is an unincorporated community in Marion County, Oregon, United States. For statistical purposes, the United States Census Bureau has defined Marion as a census-designated place (CDP). The census definition of the area may not precisely fall in with to local treaty of the area with the same name. The population was 313 at the 2010 census. Marion is allowance of the Salem Metropolitan Statistical Area.

According to the United States Census Bureau, the CDP has a total area of 1.148 square miles (2.97 km), all of it land.

As of the census of 2000, there were 274 people, 92 households, and 69 families residing in the CDP. The population density was 236.5 people per square mile (91.2/km²). There were 99 housing units at an average density of 85.4 per square mile (33.0/km). The racial makeup of the CDP was 89.42% White, 4.38% Native American, 3.28% from other races, and 2.92% from two or more races. Hispanic or Latino of any race were 5.47% of the population.

There were 92 households, out of which 33.7% had children under the age of 18 living similar to them, 64.1% were married couples lively together, 6.5% had a female householder taking into consideration no husband present, and 25.0% were non-families. 19.6% of whatever households were made taking place of individuals, and 13.0% had someone successful alone who was 65 years of age or older. The average household size was 2.98 and the average relations size was 3.38.