• The three members of the Board of Supervisors are elected at large and serve overlapping four year terms.
• The Board of Supervisors is the executive and legislative branch of county government.
• Their authority embraces practically every aspect of county government.
• The Board of Supervisors approves budget requests and appropriates the budgets and programs for all county government.
• The Board of Supervisors oversees the health and social service needs for all county residents. 
• The board also oversees land use planning and fiscal policy.

Appointments

Make appointments to non–elected county offices and to county boards and commissions. Fill vacancies in elected county offices occurring in the interim between elections except vacancies occurring in its own membership.

Budget

Approve budget proposals of county offices and levy property taxes to raise revenues.

Claims

Review claims against Harrison County and order payment of those claims.

Buildings

Manage all county buildings and grounds. Secondary Roads System

The Board has jurisdiction and control over the secondary roads system.

Social Services

Oversee the health and social service needs for all county residents.

Vote Canvassing

Make official canvass of votes cast in Harrison County for elections.

Permits

Approve applications, on behalf of the State of Iowa, permits for beer, liquor, and cigarette sales by businesses in the unincorporated areas of the county.

Tax Credits

Approve homestead and military service tax credit applications.