The NYPD headquarters is at 1 Police Plaza, located on Park Row in Lower Manhattan across the street from City Hall. The department's mission is to "enforce the laws, preserve the peace, reduce fear, and provide for a safe environment". The NYPD's regulations are compiled in title 38 of the New York City Rules. The New York City Transit Police and New York City Housing Authority Police Department were fully integrated into the NYPD in 1995 by New York City Mayor Rudy Giuliani.
In June 2004, there were about 45,000 sworn officers plus several thousand civilian employees; in June 2005, the number of officers dropped to 35,000. In December 2011 that figure increased slightly to over 36,600, helped by the graduation of a class of 1,500 from the New York City Police Academy. As of fiscal year 2018, the NYPD's current authorized uniformed strength is 38,422. There are also approximately 4,500 auxiliary police officers, 5,000 school safety agents, 2,300 traffic enforcement agents, and 370 traffic enforcement supervisors currently employed by the department. The Police Benevolent Association of the City of New York (NYC PBA), the largest municipal police union in the United States, represents over 50,000 active and retired NYC police officers.
The NYPD has a broad array of specialized services, including the Emergency Service Unit, K9, harbor patrol, air support, bomb squad, counter-terrorism, criminal intelligence, anti-gang, anti-organized crime, narcotics, public transportation, and public housing. The NYPD Intelligence Division & Counter-Terrorism Bureau has officers stationed in eleven cities internationally. In the 1990s the department developed a CompStat system of management which has also since been established in other cities.
The NYPD has extensive crime scene investigation and laboratory resources, as well as units which assist with computer crime investigations. The NYPD runs a "Real Time Crime Center", essentially a large search engine and data warehouse operated by detectives to assist officers in the field with their investigations. A Domain Awareness System, a joint project of Microsoft and the NYPD, links 6,000 closed-circuit television cameras, license plate readers, and other surveillance devices into an integrated system.
Due to its high-profile location in the largest city and media center in the United States, fictionalized versions of the NYPD and its officers have frequently been portrayed in novels, radio, television, motion pictures, and video games.
According to wikipedia