Question: Plymouth Regional High School includes students from a town in Grafton County, New Hampshire that had a population of 247 in what census year?

full_context: Document 1: Pinkerton Academy: Pinkerton Academy is a secondary school in Derry, New Hampshire, United States. It serves roughly 3,100 students, making it by far the largest high school in New Hampshire, more than 800 students greater than the next largest high school. Pinkerton's situation is unusual, as it is a private school which also serves as the "public" high school (grades 9–12) for the communities of Derry, Hampstead, Chester, Auburn, Candia, and Hooksett. Through arrangements with the towns, each town pays the tuition for their students to attend Pinkerton. For the 2014–15 school year, Hooksett students may attend Pinkerton, following the approval of a short-term enrollment agreement by the Hooksett School Board. Pinkerton Academy is a private, non-profit corporation administered by a headmaster, who in turn acts under the direction of a self-perpetuating board of trustees.
Document 2: Hamilton-Wenham Regional High School: Hamilton-Wenham Regional High School (HWRHS) is a public high school in South Hamilton, Massachusetts, United States. It is the only high school in the Hamilton-Wenham Regional School District, which has its administrative offices in Wenham, Massachusetts. The school's athletic teams are called the Generals, named after General George S. Patton, who lived in Hamilton. Students' average SAT scores are above the state average and the school regularly sends top students to Ivy League schools. In 2010, Hamilton-Wenham Regional High School placed in the top 10% of Massachusetts schools, ranking number 12, according to the Boston Magazine's Annual "Best Schools" list. In 2011, Hamilton-Wenham Regional High School moved up to number 9 in Boston Magazine's "Best Schools" list.
Document 3: Timberlane Regional High School: Timberlane Regional High School is located in Plaistow, New Hampshire, and serves as a regional high school for the towns of Atkinson, Danville, Plaistow, and Sandown, New Hampshire. The school was built in 1966 and is a part of the Timberlane Regional School District. Timberlane Regional High School is a co-educational school for grades 9-12. The school has won the 1996, 1997 and 2014 Excellence In Education Award. As of 2005, the school has approximately 1,400 students on roll. The school mascot is the owl. The school is regionally accredited for its award-winning wrestling team, which holds 23 NH State Wrestling Champions titles, as of 2015.
Document 4: Haverhill, New Hampshire: Haverhill is a town in Grafton County, New Hampshire, United States. The population was 4,697 at the 2010 census. Haverhill includes the villages of Woodsville, Pike, and North Haverhill, the historic town center at Haverhill Corner, and the district of Mountain Lakes. Located here are Bedell Bridge State Park, Black Mountain State Forest, Kinder Memorial Forest, and Oliverian Valley Wildlife Preserve. It is home to the annual North Haverhill Fair, and to a branch of the New Hampshire Community Technical Colleges. The village of North Haverhill is the county seat of Grafton County.
Document 5: Chelmsford High School: Chelmsford High School is a public, coeducational high school founded in 1917. The current building is located in North Chelmsford, Massachusetts, United States, and was built in 1974. Before 1974 the high school was located in the current McCarthy Middle School building. It serves as the public high school for students in grades nine through 12. It is part of a central campus that includes four of the town's seven schools. The three other schools at the central campus are the C. Edith McCarthy Middle School, the Col. Moses S. Parker Middle School and the Charles D. Harrington Elementary School. The town's three other schools, located throughout the town, are the Byam Elementary School, the Center Elementary School and the South Row Elementary School. Chelmsford's fifth elementary school, Westlands School, closed in 2008 due to budgetary reasons.
Document 6: Waterville Valley, New Hampshire: Waterville Valley is a town in Grafton County, New Hampshire, United States. The population was 247 at the 2010 census.
Document 7: Plymouth Regional High School (New Hampshire): Plymouth Regional High School (PRHS) is a public secondary school in Plymouth, New Hampshire, United States. Surrounding towns that attend PRHS are Ashland, Holderness, Campton, Rumney, Wentworth, Warren, Ellsworth, Waterville Valley and Thornton. Bruce Parsons is the current principal. The facility, opened in 1970, is located on Old Ward Bridge Road in Plymouth. It also housed Plymouth Elementary School until 1990. Plymouth Regional was known as Plymouth Area High School until 1991. The school colors are navy blue and white.
Document 8: Bristol, New Hampshire: Bristol is a town in Grafton County, New Hampshire, United States. The population was 3,054 at the 2010 census. It is home to Wellington State Park, Sugar Hill State Forest, and Profile Falls on the Smith River. Surrounded by hills and lakes, Bristol includes the lower two-thirds of Newfound Lake, a resort area.
Document 9: Nashua High School South: Nashua High School South, formerly Nashua High School, is a public high school located in Nashua, New Hampshire. The school's current location was erected in 1975 with its first class graduating in June 1976. The school was remodeled between 2002 and 2004 when a second school, Nashua High School North, was built. The existing high school building was renamed Nashua High School South. The school serves approximately 2200 students, making it the largest public high school in New Hampshire, and the second largest high school overall, after the private Pinkerton Academy.
Document 10: Woodsville, New Hampshire: Woodsville is a census-designated place (CDP) in the town of Haverhill in Grafton County, New Hampshire, U.S., along the Connecticut River at the mouth of the Ammonoosuc River. The population was 1,126 at the 2010 census. Although North Haverhill is now the county seat of Grafton County, the village of Woodsville has traditionally been considered the county seat, as the county courthouse was originally located there. The county buildings are now located halfway between Woodsville and the village of North Haverhill to the south.
Document 11: Grantham, New Hampshire: Grantham is a town in Sullivan County, New Hampshire, United States. The population was 2,985 at the 2010 census, up from 2,167 at the 2000 census, the greatest increase in population in Sullivan County over this time period.
Document 12: Plymouth, New Hampshire: Plymouth is a town in Grafton County, New Hampshire, United States, in the White Mountains Region. Plymouth is located at the convergence of the Pemigewasset and Baker rivers. The population was 6,990 at the 2010 census. The town is home to Plymouth State University, Speare Memorial Hospital, and Plymouth Regional High School.
Document 13: Nashua High School North: Nashua High School North is a public high school located in Nashua, New Hampshire. The school's current location was erected in 2002 with its first class graduating in June 2005, one year after the city's high schools officially split into two locations and establishments (with the earlier high school now being renamed Nashua High School South). Generally, students living north of the Nashua River attend "North", as it is commonly referred to. However students from either school can take certain classes at the other school and be bused over. The school's mascot is the Titans.
Document 14: Falmouth High School (Maine): Falmouth High School is a public high school located in the town of Falmouth, Maine. The school serves roughly 720 students in grades 9–12. Located on the Woodville Road Campus, the current Falmouth High School was completed in 2001, and opened for the 2001–2002 school year. Previously the school was shared with Falmouth Middle School, and from 1930 to 1955 was in the Plummer-Motz building located on the corner of Middle and Lunt Roads. Falmouth High School is located near the geographic center of town, and is abutted by Falmouth's Community park. The school's athletic teams are called the Yachtsmen, and the school colors are blue and white with gold as secondary.
Document 15: Grafton, New York: Grafton is a town in Rensselaer County, New York, United States. The population was 2,130 at the 2010 census. It is believed that the town received its name from Grafton, Vermont, from where the first town supervisor, Nathaniel Dumbleton, was originally from. The town is an interior town near the north-central part of the county. NY Route 2 passes across the town.
ground_truth: 2010