The Union Square local historic district is a dense area of rowhouses and commercial structures located in Southwest Baltimore. Two major features define the district: Union Square Park, a donation to the city in the 1840s, and Hollins Market in the city’s oldest market building. Generally bounded by South Schroeder, West Pratt, South Fulton, and West Baltimore Streets, the area of approximately 21 blocks is comprised of over 1,000 buildings. The district is built on a street-grid system laid down over gently sloping terrain by engineer-surveyor Thomas H. Poppleton following the land’s 1816 annexation to the city.

The Union Square local historic district is generally bounded by South Schroeder Street; West Lombard Street from Schroeder to Carey Street; the rear property lines of buildings on the south side of West Pratt; the rear property lines of properties on the west side of South Fulton Street; and the rear property lines of buildings on the north side of West Baltimore Street.  This captures the two key community anchors of the district—Hollins Market and Union Square Park—and reflects the related physical, social and cultural history of this section of the City of Baltimore.