The New Haven County Courthouse is located at 121 Elm Street in the Downtown section of New Haven, Connecticut. The building was built in 1917 and was added to the National Register of Historic Places on May 16, 2003. It faces onto the New Haven Green. Specifically it is located on the northwest corner of Elm and Church Streets, facing the northeast corner of the green, across Elm Street. It contains "several of the city's grandest interior spaces." The courthouse was designed by William H.