Millsboro is a town in Sussex County, Delaware, United States. The Town is ranked #1 out of the 25 Sussex County (the state's fastest-growing county) cities for number of residential building permits issued - a leading indicator of population growth. An emerging retail and employment center, Millsboro is home to a BJ's "club" store, a Chick-fil-A, a Lowe's, Merck facilities, an operations center for M&T Bank, Delmarva Health Pavilion, and GiggleBugs Early Learning Center. The Town is part of the Salisbury, Maryland-Delaware Metropolitan Statistical Area.
On July 21, 1930, the temperature in Millsboro rose to 110 °F (43 °C), the highest temperature ever recorded in Delaware. On January 17, 1893, the temperature fell to -17 °F (-27 °C) in Millsboro, the coldest temperature experienced in the state. Millsboro is one of only three cities in the United States to record both its state's extreme temperatures, the others being Chester, Massachusetts and Warsaw, Missouri.
The Robert Davis Farmhouse, Harmon School, Isaac Harmon Farmhouse, Harmony Church, Ames Hitchens Chicken Farm, Indian Mission Church, Indian Mission School, Indian River Archeological Complex, Johnson School, Perry-Shockley House, Warren's Mill, and Warren T. Wright Farmhouse Site at and near Millsboro are listed on the National Register of Historic Places.
Millsboro is located at 38°35′29″N 75°17′29″W (38.5915023, -75.2913018).
Department Patrol Section officers provide for the general peace and safety of Millsboro. The Criminal Investigation Section detectives investigate the most serious crimes that occur within the Town and also conduct financial and identity theft investigations. In addition to these duties, they are called upon to perform background investigations on any civilian and police applicants being considered for Town employment.
The Fire Company serves the Town of Millsboro and its surrounding district with a roster of approximately 74 active volunteer firefighters.
At the 2000 census the population density was 1,367.9 people per square mile (526.7/km2). There were 1,153 housing units at an average density of 668.3 per square mile (257.3/km2).