30188 -- U.S. ZIP code Municipality (1990): WOODSTOCK, Georgia All ZIPs for this municipality (1990): 30188 Population (2000): 36613 Housing Units (2000): 13430 Land area (2000): 44.481539 sq. miles (115.206652 sq. km) Water area (2000): 0.109512 sq. miles (0.283635 sq. km) Total area (2000): 44.591051 sq. miles (115.490287 sq. km) Located within: Georgia (GA) Location: 34.108027 N, 84.484305 W