Question: Peconic, New York and Southold Town Police Department have what county in common?

Context paragraphs:
Southold Town Police Department: The Southold Town Police Department, commonly referred to as STPD, is a professional police organization responsible for primary jurisdictional law enforcement for the town of Southold, New York.  Southold Town is located in Suffolk County.  The Southold Town Police Headquarters are located in the hamlet of Peconic, New York, with an address of 53095 Route 25, Peconic, NY 11958.  (631) 765-2600.

Clarkstown Police Department: The Clarkstown Town Police Department, is a professional police organization responsible for primary jurisdictional law enforcement for the town of Clarkstown, in Rockland County, New York.  The Clarkstown Police Headquarters are located in New City, at 20 Maple Avenue.  The department is a New York State Accredited Agency.

New York City Transit Police: The New York City Transit Police Department was a law enforcement agency in New York City that existed from 1953 (with the creation of the New York City Transit Authority) to 1995, and is currently part of the NYPD.  The roots of this organization go back to 1936 when Mayor Fiorello H. La Guardia authorized the hiring of special patrolmen for the New York City Subway.  These patrolmen eventually became officers of the Transit Police.  In 1949, the department was officially divorced from the New York City Police Department, but was eventually fully re-integrated in 1995 as the Transit Bureau of the New York City Police Department by New York City Mayor Rudolph W. Giuliani.

Southampton Town Police Department: The Southampton Town Police Department, commonly referred to as STPD, is a professional police organization responsible for primary jurisdictional law enforcement for the Town of Southampton, New York.  Southampton Town is located in Suffolk County.  The Southampton Town Police Headquarters are located in Hampton Bays, with an address of 110 Old Riverhead Rd, Hampton Bays, NY 11946 (631) 728-3400.  The department is a New York State Accredited Agency.

Peconic, New York: Peconic is a census-designated place (CDP) that roughly corresponds to the hamlet by the same name in the Town of Southold in Suffolk County, New York, United States.  The CDP population was 683 at the 2010 census.

East Hampton Town Police Department: The East Hampton Town Police Department, commonly referred to as EHTPD, is a professional police organization responsible for primary jurisdictional law enforcement for the town of East Hampton, New York.  East Hampton Town is located in Suffolk County.  The East Hampton Town Police Headquarters are located in Wainscott, with an address of 131 Wainscott Northwest Road, Wainscott, NY 11975 (631) 537-7575.  The department is a New York State Accredited Agency.

Shelter Island Town Police Department: The Shelter Island Town Police Department, commonly referred to as SIPD, is a professional police organization responsible for primary jurisdictional law enforcement for the town of Shelter Island, New York.  Shelter Island is located in Suffolk County.  The Shelter Island Town Police Headquarters are located in Shelter Island, with an address of 44 North Ferry Road - P.O. Box 1056, Shelter Island, NY 11964-1056 (631) 749-0600.

Los Angeles Police Department: The Los Angeles Police Department (LAPD), officially the City of Los Angeles Police Department, is the law enforcement agency for the city of Los Angeles, California, United States.  With 9,843 officers and 2,773 civilian staff, it is the third-largest municipal police department in the United States, after the New York City Police Department and the Chicago Police Department.  The department serves an area of 498 sqmi and a population of 4,030,904 people.

Southold Union Free School District: Southold Union Free School District is a public school district located on the North Fork of Long Island, in Suffolk County, New York, United States.  It serves the central portion of the Town of Southold, including the majority of the census-designated place(CDP) of Southold, as well as the eastern portion of the CDP of Peconic.  To the east, the district is bordered by the Greenport Union Free School District; and on the west, the Mattituck-Cutchogue Union Free School District.

Riverhead Town Police Department: The Riverhead Town Police Department, commonly referred to as RPD, is a professional police organization responsible for primary jurisdictional law enforcement for the Town of Riverhead, New York.  The Town of Riverhead is located in Suffolk County.  The Riverhead Town Police Headquarters are located in Riverhead, with an address of 210 Howell Avenue, Riverhead, NY 11901 (631) 727-4500.

Supporting paragraphs: Southold Town Police Department Peconic, New York
Answer: Suffolk County