The New York City Police Department (NYPD), officially the City of New York Police Department, is the primary law enforcement agency within the City of New York. Established on May 23, 1845, the NYPD is one of the oldest police departments in the United States, and is the largest police force in the United States. The NYPD headquarters is at 1 Police Plaza, located on Park Row in Lower Manhattan near City Hall. The NYPD's regulations are compiled in title 38 of the "New York City Rules". The NYC Transit Police and NYC Housing Authority Police Department were fully integrated into the NYPD in 1995. The NYPD services include the Emergency Service Unit, K9, harbor patrol, air support, bomb squad, counter-terrorism, criminal intelligence, anti-organized crime, narcotics, public transportation, and public housing.