Waldo, Arkansas. Waldo is a town in Columbia County, Arkansas, United States. The population was 1,372 at the 2010 census.
Reston is a census-designated place (CDP) in Fairfax County, Virginia, United States, within the Washington, D.C. metropolitan area. The population was 58,404, at the 2010 Census and 56,407 at the 2000 census.
Fairfax County is the most populous locality in Virginia, with over one million residents, although that does not include its county seat Fairfax, which is one of the independent cities. Fairfax County has a major urban business and shopping center in Tysons Corner, Virginia's largest office market.