Originally the Duboce Triangle Neighborhood Association boundaries were Market Street, Castro Street, and Duboce Avenue. In 1978 the northern boundary was extended to Waller Street from Divisadero St.  Webster St. and included the Duboce Park. Subsequently membership was also offered to neighbors and businesses that were one block beyond the defined borders.

Currently, DTNA membership is open to all residents, businesses, and property owners in San Francisco's Duboce Triangle neighborhood, bordered by Market St., Castro St., Divisadero St., Waller St., Webster St. and Duboce Avenue, and an additional block outside that area.