The Union County Planning Department is responsible for preparation and maintenance of the county's land use plan and zoning ordinances, administration and implementation of the regulations, processing public requests for special district annexations, and road creations and vacations.

The county land use plan is periodically reviewed and updated through a public review process. Department staff provides information, application assistance and documentation on the regulations to the general public. The department also provides assistance to the County Planning Commission and Board of Commissioners when they are involved in land use regulation decisions.