Harrison County is located in the northeastern corner of Texas and is part of the Longview-Marshall Metropolitan Statistical Area. The county seat is Marshall.

Harrison County is governed by a four-member Commissioners Court, with each member representing one of four precincts. The county judge presides as the chief administrator of the county. Other elected officials include the sheriff, district attorney, county clerk, tax assessor-collector, and county treasurer.

The county is served by the Harrison County Sheriff's Office, which is responsible for law enforcement and the operation of the county jail. The county is also served by the Harrison County Fire Marshal's Office, which is responsible for fire safety and prevention.

Harrison County is part of the Longview-Marshall Metropolitan Statistical Area, which includes Gregg, Harrison, Rusk, and Upshur counties. The county is served by the Longview Independent School District, which includes Marshall High School. The county is also served by the Marshall Independent School District, which includes Marshall High School.

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