The 2018 BAS maps display the updated legal boundaries and names valid thru January 1, 2017, for all governmental units that participated in the 2017 BAS. The BAS maps are an entity-based map series. These reference maps are created for the following geographic entities: counties or county equivalents, minor civil divisions (MCDs), places, consolidated cities, American Indian areas/Alaska Native areas (AIAs) and Hawaiian home lands (HHLs). For more detailed information about the 2018 BAS Maps and their naming conventions, please visit the File Naming Conventions page.

NOTE:   Some of the map files are very large in size and downloading time for these maps will vary depending on your internet access speed.