The Lowell Police Department (LPD) has the primary responsibility for law enforcement and investigation for a population of about 107,000 in the 14.5-square-mile (38 km2) city of Lowell, Massachusetts. Lowell is the fourth-largest city in the Commonwealth of Massachusetts and is county seat of Middlesex County, Massachusetts. Raymond Kelly Richardson, a 30-year veteran of the department is the current superintendent of police. The department is a member of the North Eastern Massachusetts Law Enforcement Council, which provides specialized units throughout the region.