As of the last census, there were 6,852 people, 2,739 households, and 1,750 families residing in the city. The population density was 604.7/km² (1,566.8/mi²). There were 2,928 housing units at an average density of 275.1/km² (712.7/mi²). 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 (U.S. Census)|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.
There were 2,739 households out of which 27.2% had children under the age of 18 living with them, 47.9% were married couples living together, 12.1% had a female householder with no husband present, and 36.1% were non-families. 32.3% of all households were made up of individuals and 16.4% had someone living alone who was 65 years of age or older. The average household size was 2.28 and the average family size was 2.86.
In the city the population was spread out with 23.1% under the age of 18, 9.0% from 18 to 24, 26.8% from 25 to 44, 22.2% from 45 to 64, and 18.8% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 87.9 males. For every 100 females age 18 and over, there were 83.3 males.
The median income for a household in the city was $31,045, and the median income for a family was $41,329. Males had a median income of $29,728 versus $21,134 for females. The per capita income for the city was $18,375. About 5.1% of families and 9.6% of the population were below the poverty line, including 11.9% of those under age 18 and 9.0% of those age 65 or over.
Despite its small population, Portland natives played critical roles in the most influential technological advances of both the 20th and 21st Centuries: the automobile and the Internet. Elwood Haynes (born in Portland, 1857) invented the clutch-driven automobile in 1894; and the investment banker Mary Meeker (born in Portland, 1960), made the Internet economically viable by successfully promoting it to investors in the 1990s (in the process becoming known as the "Queen of the Internet"). Other prominent Portland natives and former residents include the choreographer Twyla Tharp; the actor Leon Ames, a founder of the Screen Actors Guild in 1933; the TV producer Jack Imel (of the "Lawrence Welk Show"); the food and wine critic Alan Richman, an eight-time winner of the James Beard award for food criticism; the journalist and author Dan Rottenberg; the professional football player Darrell "Pete" Brewster; and the opera soprano Linda Brinkerhoff.