Houses And Apartments For Rent In Harford County . Subsidized apartments for seniors rent differs from apartment to apartment. Most senior apartment units in harford county are for persons age 62 and older, although a few accept younger persons with disabilities. Homes For Sale in Harford County, MD from www.homes.com 1600 ashby square dr, edgewood, md 21040. Explore rentals by neighborhoods, schools, local guides and more on trulia! Explore 19 apartments for rent in harford county with rental rates ranging from $725 to $2,338, giving you a nice selection of apartments to choose from.