Question: What was the population at the 2010 census of the incorporated village all of which is served by the East Williston Union Free School District?

Context paragraphs:
East Williston Union Free School District: The East Williston Union Free School District is a school district that serves all of East Williston and parts of Roslyn Heights, Albertson, Mineola, and Old Westbury in central Nassau County, New York.

Garden City Union Free School District: Garden City Union Free School District is headquartered at 56 Cathedral Avenue in Garden City, NY 11530 (phone 516-478-1000).  The Garden City Union Free School District is rated 35th in New York and 74th overall in the country.

Oysterponds Union Free School District: Oysterponds Union Free School District is a public school district located in the Town of Southold Suffolk County, New York, United States.  It is the easternmost school district on the North Fork of Long Island.  The district includes the census-designated places(CDPs) of East Marion and Orient.  To the west, the district is bordered by the Greenport Union Free School District.

Mattituck-Cutchogue Union Free School District: Mattituck-Cutchogue 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 primarily serves the western part of the Town of Southold, as well as a small portion of the Town of Riverhead, and includes the census-designated places of Mattituck, Cutchogue and Laurel, and portions of Jamesport and Peconic.  To the east, the district is bordered by the Southold Union Free School District; and on the west, the Riverhead Central School District.

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.

Greenport Union Free School District: Greenport Union Free School District is a public school district located on the North Fork of Long Island, in the Town of Southold, Suffolk County, New York, United States.  It includes the village of Greenport, as well as the census-designated place(CDP) of Greenport West.  To the west, the district is bordered by the Southold Union Free School District; and on the east, the Oysterponds Union Free School District.

East Williston, New York: East Williston is an incorporated village in Nassau County, New York in the United States.  The population was 2,556 at the 2010 census.

The Wheatley School: The Wheatley School is a public high school serving grades 8 through 12 located in Old Westbury, Long Island, New York and part of the East Williston Union Free School District.  The school district encompasses all of East Williston and parts of Mineola, Albertson, Old Westbury, and Roslyn Heights.

Pleasantville, New York: Pleasantville is a village in the town of Mount Pleasant, in Westchester County, New York.  The village population was 7,019 at the 2010 census.  Pleasantville is home to a campus of Pace University and to the Jacob Burns Film Center.  It was the original home of "Reader's Digest", which still uses a Pleasantville postal address.  Most of Pleasantville is served by the Pleasantville Union Free School District, with small parts of northern Pleasantville served by the Chappaqua Central School District.  The village is also home to Pleasantville High School.

Hauppauge Union Free School District: Hauppauge Union Free School District is a school district based in Hauppauge, New York.  It is near the Commack School District and Half Hollow Hills Central School District, as well as the Syosset Central School District and Jericho Union Free School District in Nassau County

Supporting paragraphs: East Williston Union Free School District East Williston, New York
Answer: 2,556