The Dennis–State Streets Historic District is a residential historic district located on the south side of the city of Adrian in Lenawee County, Michigan. It was listed as a Michigan Historic Site on July 26, 1974. The district was later added to the National Register of Historic Places on April 14, 1975. On July 26, 1979, the historic district expanded its boundaries. This expansion, albeit consisting of only one additional property, required a separate listing on the National Register of Historic Places. The district is located just south of the Downtown Adrian Commercial Historic District and just east of M-52, known locally as Main Street. The district is bounded by Union Street on the north, a set of railroad tracks on the south, State Street on the east, and Dennis Street on the west. West Michigan Street also runs through the district. The boundaries of the historic district include all properties fronting on both sides of the streets. Four years after the district was listed on the National Register of Historic Places, one additional property was added. The George L. Bidwell Mansion, known today as the Burnham Historical Building, at 204 East Church Street, which is outside the rectangular boundaries of the historic district, was added as a contributing property on July 26, 1979. It was the only property added during this boundary extension. There are a total of 80 residential structures included as contributing properties within the district. While the area was first settled as early as 1826, some of the oldest surviving structures date back to the 1844, when the district was platted. Originally known as "Berry's Southern Addition," this district was platted in 1844 by Langford and Ambrose Berry on land that they purchased from the estate of 1826 pioneers Adeline and Elias Dennis. Several of the homes in the neighborhood date to the 1840s, when Adrian was linked by railroad to Toledo (1836), Tecumseh (1838), Monroe (1840), and Hudson (1843), and became the sixth largest city in Michigan. Because of the neighborhood's ideal location, within walking distance to Adrian's commercial center, churches, and social orders, as well as its factories and rail lines, over time many early homes were either redecorated or torn down and replaced with homes of newer styles. This neighborhood is worth exploring first and foremost because it contains many beautifully maintained homes that were built in a broad range of popular nineteenth-