Wardner is a city in Shoshone County, Idaho, United States. Located in the Silver Valley mining region, the population was 188 at the 2010 c…Wardner is a city in Shoshone County, Idaho, United States. Located in the Silver Valley mining region, the population was 188 at the 2010 census, down from 215 in 2000. According to the United States Census Bureau, the city has a total area of 0.86 square miles, all of it land.