Umatilla County is located in the northeastern corner of Oregon and is part of the Umatilla County government. The county seat is Pendleton, Oregon. The county was established in 1862 and has a population of 75,889 as of the 2020 census.

The county is governed by a five-member Board of County Commissioners, who are elected to four-year terms. The county is divided into five commissioner districts.

The county is home to the Confederated Tribes of the Umatilla Indian Reservation, which is the largest Native American reservation in Oregon. The county also includes the cities of Hermiston, Milton-Freewater, Pendleton, Pilot Rock, and Stanfield.

The county is served by the Umatilla County Sheriff's Office, which is responsible for law enforcement in the county. The county also has a number of other law enforcement agencies, including the Oregon State Police, the Umatilla County District Attorney's Office, and the Umatilla County Juvenile Department.

The county is served by the Umatilla County School District, which operates a number of public schools in the county. The county is also home to a number of private schools, including the Pendleton Christian Academy and the Umatilla County Academy.

The county is served by the Umatilla County Library System, which operates a number of public libraries in the county. The county is also home to a number of museums, including the Pendleton Round-Up Museum and the Umatilla County Historical Museum.

The county is served by the Umatilla County Health Department, which is responsible for public health in the county. The county is also home to a number of hospitals, including the Good Shepherd Medical Center and the Umatilla County Medical Center.

For the most up-to-date and in-depth information, please check the public records links below.