Portia is a town in Lawrence County, Arkansas, United States. The population was 483 at the 2000 census.Portia is located at 36°5′7″N 91°4′6″W / 36.08528°N 91.06833°W / 36.08528; -91.06833.According to the United States Census Bureau, the town has a total area of 3.3 km², all land.As of the census of 2000, there were 483 people, 206 households, and 138 families residing in the town. The population density was 144.6/km². There were 225 housing units at an average density of 67.3/km². The racial makeup of the town was 97.10% White, 1.24% Black or African American, 1.45% Native American, and 0.21% from two or more races. 1.66% of the population were Hispanic or Latino of any race.There were 206 households out of which 25.7% had children under the age of 18 living with them, 55.3% were married couples living together, 11.2% had a female householder with no husband present, and 33.0% were non-families. 31.6% of all households were made up of individuals and 21.