Frankewing is an unincorporated community in Giles County, Tennessee, United States. The 2016 Frankewing, Tennessee, population is 558. There are 27 people per square mile. Family in Frankewing, Tennessee. The median age is 46.3. The US median is 37.4. 52.89% of people in Frankewing, Tennessee, are married. 6.41% are divorced. The average household size is 2.52 people. 20.67% of people are married, with children. 11.17% have children, but are single.