The Prosser city profile shows the demographics of the city and its surrounding areas. In 2010, the population of Prosser was 27,479, and the highest number was 91. The median age was 36.4 years. The median household size was 2.6 people, and the average household was made up of two people. The city is home to a small, eclectic mix of people.
In the early 19th century, the area was home to Native Americans who called it "Tap tut." The Northern Pacific Railroad laid railroad tracks through the area in 1882. Colonel William Farrand Prosser filed a town plat in 1885. In 1892, he was elected to serve as the Yakima County Auditor, and then later to the North Yakima County Auditor position.
In Prosser, Washington, the average household income is $136,700, which puts the town in the middle class. In Prosser, women earn an average of $58,599 compared to males. The median household income in Prosser is $45,170, which is slightly above the national average. The median home value is $55,166, and the average household size is 3.1.