Question: Which county is the oyster river high school located?

Context paragraphs:
Toms River High School North: Toms River High School North is a four-year comprehensive public high school, and was the second public high school established in Toms River, in Ocean County, New Jersey, United States, operating as part of the Toms River Regional Schools.  The school opened in 1969 when the original high school (now called Toms River High School South) was found to be too small to accommodate the fast-growing community.  However, the first class to graduate wasn't until 1971, since all of the seniors were kept at TRHSS for the class of 1970.  Toms River High School North is the largest of all schools in the Toms River Regional School district.  The TRHSN mascot is the Mariner, and the school colors are navy blue and gold.  The other high schools in the district are Toms River High School East and Toms River High School South.

Barrington, New Hampshire: Barrington is a town in Strafford County, New Hampshire, United States.  The population was 8,576 at the 2010 census.  The town is a woodland, farm and bedroom community.

Ethan Gilsdorf: Ethan Gilsdorf is an American writer, poet, editor, critic, teacher and journalist.  He was born in Dover, New Hampshire, and raised in the nearby town of Lee.  He has lived in Northampton and Amherst, Massachusetts; Brattleboro, Vermont; Baton Rouge, Louisiana; Paris, France; and currently lives in Somerville, Massachusetts.  He attended Oyster River High School in Durham, New Hampshire, and received his B.A. from Hampshire College and his MFA from Louisiana State University.

South River High School (New Jersey): South River High School is a four-year comprehensive community public high school that serves students in ninth through twelfth grades from South River in Middlesex County, New Jersey, United States, operating as the lone secondary school of the South River Public Schools.  South River High School is overseen by the New Jersey Department of Education.

Elk River High School: Elk River High School (variously as Elk River Senior High School) is a public high school located in Elk River, Minnesota.  It is the one of three high schools in the Elk River Area School District (ISD 728) and its feeder schools are VandenBerge Middle School and Salk Middle School.  In the 201112 school year, Elk River had an enrollment of 1,649 students.  Elk River's colors are red and white.  The National Center of Education Statistics classifies the high school as a large, suburban campus.  The Elk River Elks compete in the Northwest Suburban Conference of the Minnesota State High School League as well as in Section 6AAAAA (5A) for football.  Elk River High School opened in 1888.

Toms River High School South: Toms River High School South is a comprehensive four-year public high school, and was the first high school established in Toms River (formerly Dover Township) in Ocean County, New Jersey, United States, serving students in ninth through twelfth grades as part of the Toms River Regional Schools.  The original Toms River High School graduated its first class in 1891 and the current building opened for students in 1951.  In 1969, when the high school was found to be too small, a second high school, Toms River High School North was opened and "South" was appended onto the school's original name, and a third high school in the district, Toms River High School East, was opened in 1979.

Oyster River High School: Oyster River High School (ORHS), part of the Oyster River Cooperative School District (ORCSD), is a public high school located in Durham, New Hampshire, United States, with an enrollment of about 700 students.  It serves Durham and the neighboring communities of Lee, Barrington, and Madbury.  The high school opened and the first graduating class was in 1956.  Dean Sackett was the Chairman of the School Board, Arthur E. Toll was the Superintendent of Schools, John H. Day was Principal, and George W. Pasichuke was the Associate Principal.  The school yearbook is named Trion, named by Margaret Campbell in a school-wide contest.  The high school moved to its present site on October 22, 1964.

Wood River High School (Idaho): Wood River High School is a public secondary school in Hailey, Idaho, one of two traditional high schools operated by the Blaine County School District #61 (the smaller Carey High School (K-12) is the other).  Wood River High School serves the communities of Bellevue, Hailey, Ketchum, and Sun Valley, all in the valley of the Big Wood River, and the current campus opened in August 2003.  The school colors are green and white and the mascot is a wolverine.

Salt River High School: Salt River High School is a high school on the Salt River Pima-Maricopa Indian Community near Scottsdale, Arizona.  It is operated by that tribe's Education Department along with an early education/Head Start facility, elementary school, alternative school and higher education department.  The high school opened in August 2004 with an award-winning campus and grounds.  Salt River High School is located on a federally recognized Native American reservation, which provides students and families opportunities to learn and partake in the rich histories and contemporary experiences of both the O'Odham (Pima) and Piipaash (Maricopa) people who reside within and/or are members of the Salt River Pima-Maricopa Indian Community.  Salt River High School is a member of the Canyon Athletic Association.

Toms River High School East: Toms River High School East is a comprehensive four-year public high school, the third high school built in Toms River in Ocean County, New Jersey, United States, serving students in ninth through twelfth grades as part of the Toms River Regional Schools.  It was built in 1979, as the first and second high schools, Toms River High School South and Toms River High School North, were too small for the rapid population growth in the district.

Supporting paragraphs: Oyster River High School Barrington, New Hampshire
Answer: Strafford County