Coulee Dam, WA (the Okanogan County portion of the town), from Crown Point locking east. – Steven Pavlov, CC BY-SA 4.0 – Wikimedia Commons Coulee Dam is located in Washington. About 1,211 people live here (as of 2020). Between 2010 and 2020, the population grew from 1,098 to 1,211. The region is at 349 meters above sea level. The area covers about 2.0 square kilometers. There are about 73 streets in Coulee Dam. The region was founded in 1933. The postal codes are 99116. The dialing code is 509. Coulee Dam is town in Washington, USA. Among other things, Coulee Dam has supermarkets and banks. More information at townofcouleedam.org.