It was added to the National Register of Historic Places on June 17, 1993 for its significance in architecture, politics/government, and community planning.

[3] The three contributing buildings in the district face Watchung Avenue.

Built 1915–1919, the Plainfield City Hall was designed by architects Peck and Bottomley and features Georgian Revival architecture.

Built in 1928, the former Seventh-Day Baptist Building, now the City Hall Annex, features Jacobethan Revival architecture.

Built in 1927, the Plainfield War Memorial, a contributing object, features a flagpole on a tier of pink granite circular steps.