Two new shopping centers opened recently in the Washington area in Gaithersburg and Columbia.

Gaithersburg's Montgomery Village Off-Price Center was developed on an 11-acre tract of land near Lakeforest Mall by Western Development Corp. The $9 million shopping center contains 25 stores in 117,465 square feet of space and 735 parking spaces.

Among the merchants at the center are T. H. Mandy, Mill End Shops, the Hair Cuttery, Crown Books, Trak Auto, Technicolor One-Hour Photo, Rian Cleaners, Linens 'n Things, Jay's Apparel and Accent Wallcoverings.

The discount center also houses a branch of the Bank of Maryland, a Safeway store, a restaurant, a beer and wine store and several fast-food operations.

Columbia's Dobbin Center, with 14 stores over 246,00-square-feet of space, was built by Howard Research and Development Inc., a joint venture of the Rouse Co. and Connecticut General Corp. It is located at the intersection of Dobbin Road and Route 175.

Merchants at the center include Hechinger's, Crown Books, Trak Auto, Kemp Mill Records, Contemporary Sounds, Annapolis Clothing and Minnesota Fabrics.

The center also has a branch of the First National Bank of Maryland and two fast-food restaurants.