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.
Reston is located at 38Â°57â²16â³N 77Â°20â²47â³Wï»¿ / ï»¿38.95444Â°N 77.34639Â°Wï»¿ / 38.95444; -77.34639. According to the United States Census Bureau, the CDP has a total area of 17.4 square miles (45.0 kmÂ²), of which, 17.1 square miles (44.4 kmÂ²) of it is land and 0.2 square miles (0.5 kmÂ²) of it (1.21%) is water.