Question: What is the population of the county in which Jamesburg Park, New Jersey lies?

Context paragraphs:
Jamesburg, New Jersey: Jamesburg is a borough in Middlesex County, New Jersey, United States.  As of the 2010 United States Census, the borough's population was 5,915, reflecting a decline of 110 (-1.8%) from the 6,025 counted in the 2000 Census, which had in turn increased by 731 (+13.8%) from the 5,294 counted in the 1990 Census.

Buckelew Mansion: Buckelew Mansion, also known as Lakeview, is a historic home in Jamesburg, Middlesex County, New Jersey, United States.  It now serves as a museum of local history and the headquarters of the Jamesburg Historical Association.

Monroe Township High School: Monroe Township High School is a comprehensive four-year public high school located in Monroe Township, in Middlesex County, New Jersey, United States, serving students in ninth through twelfth grades part of the Monroe Township School District.  The school serves students from Monroe Township and those from Jamesburg Borough who attend Monroe Township High School as part of a sending/receiving relationship with the Jamesburg Public Schools that has been in place since 1980.  The school's mascot is a falcon and the school colors are purple and Vegas gold.  The motto is "Excellence is Our Expectation".

East Spotswood, New Jersey: East Spotswood, also known as the settlement of Old Bridge, is an unincorporated community located within East Brunswick, New Jersey and Old Bridge townships in Middlesex County, New Jersey, United States.  The area is made up of homes, businesses, and wetlands for the South River.  The area is located at the junction of New Jersey Route 18, County Route 527 (which is routed along Old Bridge-Englishtown Road, Old Matawan Road, and Old Bridge Turnpike), the western end of CR 516, and the Bordentown and South Amboy Turnpike (CR 615).  The still-active Jamesburg Branch of the former Camden & Amboy Railroad also runs through the community.

Middlesex County, New Jersey: Middlesex County is a county located in north-central New Jersey, United States.  As of the 2016 Census estimate, the county's population was 837,073, making it the state's second-most populous county, an increase of 3.4% from the 2010 United States Census, when its population was enumerated at 809,858, making it the second-most populous county in the state.  Middlesex is part of the New York metropolitan area, and its county seat is New Brunswick.  The center of population of the state of New Jersey is located in Middlesex County, in East Brunswick Township, just east of the New Jersey Turnpike.  The 2000 Census showed that the county ranked 63rd in the United States among the highest-income counties by median household.  The Bureau of Economic Analysis ranked the county as having the 143rd-highest per capita income of all 3,113 counties in the United States (and the 10th-highest in New Jersey) as of 2009.  Middlesex County holds the nickname, "The Greatest County in the Land".

New Jersey: New Jersey is a state in the Northeastern and mid-Atlantic regions of the United States.  It is a peninsula, bordered on the north and east by the state of New York; on the east, southeast, and south by the Atlantic Ocean; on the west by the Delaware River and Pennsylvania; and on the southwest by the Delaware Bay and Delaware.  New Jersey is the fourth-smallest state by area but the 11th-most populous and the most densely populated of the 50 U.S. states.  New Jersey lies entirely within the combined statistical areas of New York City and Philadelphia and is the third-wealthiest state by median household income as of 2016.

Freehold and Jamesburg Agricultural Railroad: The Freehold and Jamesburg Agricultural Railroad was a short-line railroad in New Jersey.  Its former right-of-way, along with a portion of the Farmingdale and Squan Village Railroad's right-of-way, has become the Edgar Felix Bikeway and the Freehold right-of-way has become the Henry Hudson Trail.  The railroad was formed under a special law of New Jersey, on May 21, 1879 it was incorporated, in which three railroads consolidated to form the Company, including the Farmingdale and Squan Village Railroad, the Freehold Marl Company Railroad (which later became the Monmouth County Agricultural Railroad) and Camden and Amboy Rail Road and Transportation Company.  The headquarters of the railroad was in Jamesburg.  In 1853, the establishment of the Jamesburg & Freehold Agricultural Railroad caused Jamesburg to become a railroad hub.  The length of the trackage amounting to 27.323 mi .  The Allaire family was a major stock holder in the company and James P. Allaire's son, Hal, was on the board of directors.

Jamesburg Public Schools: The Jamesburg Public Schools are a community public school district that serves students in kindergarten through eighth grade from Jamesburg, in Middlesex County, New Jersey, United States.

Jamesburg Park, New Jersey: Jamesburg Park is an unincorporated community located within East Brunswick Township in Middlesex County, New Jersey, United States.  It is adjacent to a park of the same name.

14th Legislative District (New Jersey): New Jersey's 14th Legislative District is one of 40 in the New Jersey Legislature, covering the Mercer County municipalities of East Windsor Township, Hamilton Township, Hightstown Borough and Robbinsville Township; and the Middlesex County municipalities of Cranbury Township, Jamesburg Borough, Monroe Township, Plainsboro Township and Spotswood Borough as of the 2011 apportionment.

Supporting paragraphs: Jamesburg Park, New Jersey Middlesex County, New Jersey
Answer: 837,073