A description of changes to Wildlife Management Unit boundaries for the 2015-16 license year can be found here.
Detailed WMU Maps from Digest
Wildlife Management Units are designed to improve wildlife management and, at the same time, simplify hunting and trapping regulations. The units are being used to manage all game, except elk, waterfowl and other migratory game birds. The units are based on land use/habitat, human density, public/private land ownership, recognizable physical features, such as major roads and rivers, and land use practices, such as agriculture, timber and development.