Sumner is a somewhat small city located in the state of Washington. With a population of 10,595 people and two associated neighborhoods, Sumner is the 91st largest community in Washington.

Housing costs in Sumner are among some of the highest in the nation, although real estate prices here don't compare to real estate prices in the most expensive communities in Washington.

Sumner is home to a number of people employed in the armed forces. When you visit or walk around Sumner, some of the people you will bump into will be military people In and out of uniform, jogging, shopping and generally out and about town.

Also of interest is that Sumner has more people living here who work in computers and math than 95% of the places in the US.

A relatively large number of people in Sumner telecommute to their jobs. Overall, about 9.98% of the workforce works from home. While this may seem like a small number, as a fraction of the total workforce it ranks among the highest in the country. These workers are often telecommuters who work in knowledge-based, white-collar professions. For example, Silicon Valley has large numbers of people who telecommute. Other at-home workers may be self-employed people who operate small businesses out of their homes.

The education level of Sumner citizens is a little higher than the average for US cities and towns: 24.19% of adults in Sumner have at least a bachelor's degree.

The per capita income in Sumner in 2022 was $42,659, which is upper middle income relative to Washington and the nation. This equates to an annual income of $170,636 for a family of four. However, Sumner contains both very wealthy and poor people as well.

Sumner is a very ethnically-diverse city. The people who call Sumner home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Sumner residents report their race to be White, followed by Native Hawaiian. Sumner also has a sizeable Hispanic population (people of Hispanic origin can be of any race). People of Hispanic or Latino origin account for 17.95% of the city’s residents. Important ancestries of people in Sumner include German, Irish, English, Norwegian, and Italian.

The most common language spoken in Sumner is English. Other important languages spoken here include Spanish and Mon-Khmer (Cambodian).