The Washington Street Historic District encompasses a residential area of Middletown, Connecticut that has a long history as a fashionable and desirable neighborhood.

Extending along Washington Street and Washington Terrace between Main and Jackson Streets, the area has a broad diversity of residential architecture dating from 1752 to 1931, reflecting the city's patterns of growth.

During this period, merchants and ship captains built fashionable houses along Washington Street, which was then known as Boston Road.

The residential architecture of Washington Street is reflective of the changing fortunes of the city.

In addition to the park, the district also includes the West Burying Ground and 32 contributing buildings dating from 1752 to 1931 with examples of Late 19th and 20th Century Revivals, Greek Revival, and Late Victorian architecture.