Elma is a city in Grays Harbor County, Washington, United States. The population was 3,107 at the 2010 census. Take a look below for 15 fascinating and fun facts about Elma, Washington, United States. 1. Elma is located at 47°0′20″N 123°24′23″W (47.005648, -123.406268). 2. According to the United States Census Bureau, the city has a…