Sumner is located in North Pierce County, major cities located near Sumner include Puyallup, WA to the west, Auburn, WA to the North, and Enumclaw to the east. Pierce County, Washington, in the United States. As of the 2000 census, the city population was 8,504 and according to the Office of Financial Management had a population of 9,060 in 2008.
Sumner suffered a major downtown fire in 1895, but has since been rebuilt using brick and stone construction. Many turn-of-the-century stores are now occupied by antique and specialty shops and businesses.
According to the United States Census Bureau, the city has a total area of 6.7 square miles (17.4 km²), of which, 6.7 square miles (17.3 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.45%) is water.
There were 3,517 households out of which 32.0% had children under the age of 18 living with them, 44.4% were married couples living together, 13.7% had a female householder with no husband present, and 37.0% were non-families. 30.7% of all households were made up of individuals and 11.8% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average family size was 2.98.
In the city the population was spread out with 26.5% under the age of 18, 8.7% from 18 to 24, 30.3% from 25 to 44, 21.1% from 45 to 64, and 13.4% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 94.0 males. For every 100 females age 18 and over, there were 89.0 males.
The median income for a household in the city was $38,598, and the median income for a family was $42,602. Males had a median income of $36,250 versus $29,221 for females. The per capita income for the city was $18,696. About 4.5% of families and 8.5% of the population were below the poverty line, including 9.3% of those under age 18 and 8.6% of those age 65 or over.