Portland is a city in and the county seat of Jay County, Indiana, United States. The population was 6,223 at the 2010 census. As of the census of 2000, there were 6,437 people, 2,739 households, and 1,750 families residing in the city. The population density was 1,566.8 people per square mile (604.7/km2). There were 2,928 housing units at an average density of 712.7 per square mile (275.1/km2). The racial makeup of the city was 96.49% White, 0.37% African American, 0.11% Native American, 0.34% Asian, 0.05% Pacific Islander 1.80% from other races, and 0.84% from two or more races. Hispanic or Latino of any race were 3.36% of the population.