Olney is a census-designated place and an unincorporated area of Montgomery County, Maryland, located in the north central part of the state, twenty miles north of Washington, D.C. It was largely agricultural until the 1960s, when growth of the Washington suburbs led to its conversion into a mostly residential area. As generally defined, Olney had a total population of 31,438 in the 2000 census. In July 2007, Money magazine ranked Olney as 17 out of 100 in its 'America's Best Places To Live' edition. Olney apartments for rent comparison page shows most up to date rent information on Olney apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.