Question: What county is the city where Stillwater Area High School located part of?

full_context: Document 1: Longview Heights, Washington: Longview Heights is a census-designated place (CDP) in Cowlitz County, Washington, United States. The population was 3,851 at the 2010 Census. The CDP is known locally as Columbia Heights.
Document 2: Washington Township, Henry County, Ohio: Washington Township is one of the thirteen townships of Henry County, Ohio, United States. As of the 2010 census the population was 1,912, of whom 1,794 lived in the unincorporated portion of the township.
Document 3: Washington Township, Parke County, Indiana: Washington Township is one of thirteen townships in Parke County, Indiana, United States. As of the 2010 census, its population was 1,302 and it contained 457 housing units.
Document 4: Forest Lake, Minnesota: Forest Lake is a city in Washington County, Minnesota, United States. It is 27 miles northeast of Saint Paul. The population was 18,375 at the 2010 census. The 2016 population is 20,216. It is on one of Minnesota's 100 largest lakes. The lake serves as the source of the Sunrise River.
Document 5: Washington, Maine: Washington, officially the Town of Washington, is a town in Knox County, Maine. The population was 1,527 at the 2010 United States Census.
Document 6: Oklahoma City: Oklahoma City is home to the state's largest school district, Oklahoma City Public Schools. The district's Classen School of Advanced Studies and Harding Charter Preparatory High School rank high among public schools nationally according to a formula that looks at the number of Advanced Placement, International Baccalaureate and/or Cambridge tests taken by the school's students divided by the number of graduating seniors. In addition, OKCPS's Belle Isle Enterprise Middle School was named the top middle school in the state according to the Academic Performance Index, and recently received the Blue Ribbon School Award, in 2004 and again in 2011. KIPP Reach College Preparatory School in Oklahoma City received the 2012 National Blue Ribbon along with its school leader, Tracy McDaniel Sr., being awarded the Terrel H. Bell Award for Outstanding Leadership.
Document 7: Lakeville North High School: Lakeville North High School (LNHS) is a public high school in northern Lakeville, Minnesota. Formerly Lakeville High School, LNHS received its current name when a second high school, Lakeville South High School, was built. Grades 9-12 attend the school, and its principal is Marne Berkvam.
Document 8: Falls High School: Falls High School is a public high school located in International Falls, Minnesota. The school's class ring design is the oldest class ring tradition in the United States, dating back to 1929. As of 2014 approximately 600 students attend classes in the school. Every grade level ranges from 70-100 students. In the Fall of 2014 the school changed policies and changed over from a 6 period day to a 7 period day. The students have 5 minutes between each class to maneuver to the next one.
Document 9: Dearborn Heights, Michigan: Dearborn Heights is a city in Wayne County, in the Detroit metropolitan area, in the State of Michigan. The population was 57,774 at the 2010 census.
Document 10: Miami High School: Miami Senior High School is a public high school located at 2450 SW 1st Street in Miami, Florida, United States, and operated by Miami-Dade County Public Schools. Founded in 1903, it is the oldest high school in Miami-Dade County. The school building is famous for its architecture and is a historic landmark. Miami Senior High School has a rich alumni base, with many graduates of the high school going on to varied, prominent careers. The high school originally served the earliest settling families of Miami in the first half of the 20th century. By the late 1960s, with an increase in Miami's population, its student body grew at a fast pace.
Document 11: Sandy High School: Sandy High School (formerly known as Sandy Union High School) is a public high school in Sandy, Oregon, United States, established in 1917. Originally located in a two-story schoolhouse, the high school was given its own standalone brick structure, used now as Cedar Ridge Middle School, in 1923, to accommodate a growing student body as the Portland metropolitan area and surrounding cities expanded in population.
Document 12: Stillwater Area High School: Stillwater Area High School (SAHS) is a public school located in Oak Park Heights, Minnesota, and is part of the Stillwater Area Public Schools, District 834. As the oldest high school in Minnesota and the first accredited by the North Central Association (now known as AdvancED) in 1903, Stillwater Area High School claims a special sense of history.
Document 13: Oak Park Heights, Minnesota: Oak Park Heights is a city in Washington County, Minnesota, United States. The population was 4,339 at the 2010 census.
Document 14: Forest Lake Area High School: Forest Lake Area High School, also known as Forest Lake High School, is a public four-year high school in Forest Lake, Minnesota founded in 1909. The school is a member of Minnesota Independent School District 831 (Forest Lake Area School District). The school competes in the Suburban East Conference of the Minnesota State High School League
Document 15: Inver Grove Heights, Minnesota: Inver Grove Heights is a city in Dakota County, Minnesota, United States. The population was 33,880 at the 2010 census. The city was formed on March 9, 1965, with the merger of the village of Inver Grove and Inver Grove Township.
ground_truth: Washington County
sub_queries: Stillwater Area High School >> located in the administrative territorial entity Answer: Oak Park Heights
Oak Park Heights >> located in the administrative territorial entity Answer: Washington County