Trowbridge Square Historic District, originally known as Village of Spireworth and Mount Pleasant, is a well-preserved 19th-century neighborhood in the Hill section of New Haven, Connecticut. Roughly bounded by Columbus, Howard, and Union Avenues, and Church Street on the east, the area was laid out in 1830 and developed as a working-class neighborhood. It retains its historic streetscape, and many original buildings, representing modest versions of a diversity of mid-to-late 19th century styles. The district was listed on the National Register of Historic Places in 1985.