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.
Zip Code 20171 is located in the state of Virginia in the Washington D.C. metro area. Zip code 20171 is primarily located in Fairfax County. The official US Postal Service name for 20171 is HERNDON, Virginia. Portions of zip code 20171 are contained within or border the city limits of Reston, VA, Chantilly, VA, . Zip code 20171 is within area code 571 and area code 703.