The Prosser Library has 10 computers freely available to the public, as well as wireless internet access.

Our after-hours bookdrop is on the side of the building, next to the parking lot.

Interested in becoming more involved in your library?
Volunteers are welcome to apply at any time. You can also participate as a member of The Prosser Friends of the Library. The Prosser FOL supports library programs and services through the sale of gently used books in a display located in the library lobby. Please contact the library if you are interested in becoming a Friend or donating items, or email prosserfriendsofthelibrary at The Board is currently meeting on the first Friday of every month at 1 p.m.

The library is conveniently located near downtown Prosser, across from Prosser High School.

Prosser Heritage Collection is now online. This project, showcasing historical photos from the Prosser area, was supported by a grant from the Washington State Library and assistance provided by the Benton County Historical Museum.


902 7th St. Prosser, WA 99350

(509) 786-2533

Hours of Operation

Monday: 11 AM - 7 PM
Tuesday: 11 AM - 7 PM
Wednesday: 11 AM - 7 PM
Thursday: 11 AM - 7 PM
Friday: 11 AM - 7 PM
Saturday: 10 AM - 3 PM
Sunday: Closed
Supervisor: Katy McLaughlin

Fascinating Facts

The City of Prosser Library building was built in 1973, and Benton County residents were served by a bookmobile and then a branch also located in Prosser. In 2001, the city contracted with county library system to combine services as the Prosser Branch of the Mid-Columbia Libraries.