Nathan and Mary Polly Johnson properties

The Nathan and Mary (Polly) Johnson properties, located at 17–19 and 21 Seventh Street in New Bedford, Massachusetts, are a National Historic Landmark. The complex comprises two buildings: one originally constructed as a Quaker meetinghouse in 1785, later converted into a residence by Nathan Johnson in 1832, and another built in 1857 as Polly Johnson's home. These properties hold significance for their association with the abolitionist movement and as the only surviving residence in New Bedford of Frederick Douglass.

Nathan and Polly Johnson were free African-Americans who actively participated in the Underground Railroad, sheltering escaped slaves from 1822 onward. Nathan worked as a caterer and Polly as a confectioner, achieving notable success in their businesses. The properties reflect their involvement in the abolitionist cause and their contributions to the community.

The buildings have been restored and now house the New Bedford Historical Society, offering tours by appointment. Designated a National Historic Landmark in 2000, the properties are also contributing elements to the local County Street Historic District. Their architecture includes features such as wood-frame structures, gable roofs, and historic interior details, with theories about their use in hiding fugitives remaining unsubstantiated by evidence.