Question: In which Maine county is Fort Pownall located?

Context paragraphs:
Fort Frederick (Saint John, New Brunswick): Fort Frederick was a British fort at what is now Saint John, New Brunswick, Canada.  It was built during the St. John River Campaign of the French and Indian War.  It was one of three significant forts which the British built on the major rivers in the Northeast to cut off the natives water way to the ocean (also see Fort Halifax and Fort Pownall).

Fort Pownall: Fort Pownall was a British fortification built during the French and Indian War, whose remains are located at Fort Point State Park in Stockton Springs, Maine.  The fort was named for Governor Thomas Pownall, who oversaw its construction.  It never saw action, and was destroyed during the American Revolutionary War by the actions of both colonists and the British military to prevent its further use.  The fort's remains were listed on the National Register of Historic Places in 1969.

Fort Levett: Fort Levett was a former U.S. Army fort built on Cushing Island, Maine beginning in 1898.  Located in Cumberland County, Maine, in Casco Bay near Portland, Maine, the fort was heavily fortified with guns for coastal defense.  Conceived under the Endicott Program in 1885 and begun in the wake of the Spanish–American War, Fort Levett was manned during both World Wars.  The fort's name is sometimes mis-spelled as "Fort Leavitt".

Fort Point State Park: Fort Point State Park is a public recreation area with historic features that overlooks Penobscot Bay from the easternmost tip of Cape Jellison in the town of Stockton Springs, Maine.  The state park's 156 acre feature the Fort Point Light and the site of historic Fort Pownall.  The park offers hiking trails, picnicking, and fishing.

Fort Chiswell Site: Fort Chiswell Site is a historic archaeological site located at Fort Chiswell, Wythe County, Virginia.  It is the site of a frontier fort built in 1758 as an outpost during the French and Indian War.  The fort was situated at the junction of the Great Trading Path and the Richmond Road, near the New River.  The fort fell into disrepair in the 18th century as both the county seat and courthouse were moved from Fort Chiswell to the county seat of Wytheville, 12 miles to the west.  The remaining foundations of the Fort and its surrounding buildings were completely covered over during the construction of I-77 in Wythe County during the 1970s.  There is a pyramid shaped historical marker of sandstone situated approximately 200 yards west-northwest of the fort's original location next to the old chicken house.

Stockton Springs, Maine: Stockton Springs is a town in Waldo County, Maine, United States.  The population was 1,591 at the 2010 census.  Stockton Springs is home to Fort Point State Park and Fort Point Light, both located on Fort Point, a peninsula on Cape Jellison.

Fort Mary (Maine): Fort Mary was a British fort built in 1688 that saw action during Queen Anne's War and was located in Saco, Maine overlooking Winter Harbor / Biddeford Pool.  The fort replaced Fort Saco (1708), which was built at Saco Falls during King William's War.  The commander of the fort during King William's War was Captain John Hill.  The fort was attacked in the Northeast Coast Campaign (1703) and natives killed 11 English and took 24 prisoner.  Saco was raided again in 1704 and 1705.  They overwhelmed the garrison in the fort at Winter Harbor (in present-day Biddeford near Biddeford Pool), forcing them to submit to terms of capitulation.  Winter Harbor was raided two more times, in 1707 and 1710.

Lincoln County, Maine: Lincoln County is a county located in the U.S. state of Maine.  As of the 2010 census, the population was 34,457.  Its county seat is Wiscasset.  The county was founded in 1760 from a portion of York County, Massachusetts and named after the English city Lincoln, the birthplace of Massachusetts Bay Provincial Governor Thomas Pownall.

Fort Halifax (Maine): Fort Halifax is a former British colonial outpost on the banks of the Sebasticook River, just above its mouth at the Kennebec River, in Winslow, Maine.  Originally built as a wooden palisaded fort in 1754, during the French and Indian War, only a single blockhouse survives.  A National Historic Landmark, it is the oldest blockhouse in the United States.  It is now set in a municipal park, and is open to the public in the warmer months.  It was the first of three significant forts which the British built on the major rivers in the Northeast to cut off the native water ways to the ocean (also see Fort Pownall and Fort Frederick (Saint John, New Brunswick)).

Fort Knox (Maine): Fort Knox, now Fort Knox State Park or Fort Knox State Historic Site, is located on the western bank of the Penobscot River in the town of Prospect, Maine, about 5 mi from the mouth of the river.  Built between 1844 and 1869, it was the first fort in Maine built entirely of granite; most previous forts used wood, earth, and stone.  It is named after Major General Henry Knox, the first U.S. Secretary of War and Commander of Artillery during the American Revolutionary War, who at the end of his life lived not far away in Thomaston.  The fort was designated a National Historic Landmark in 1970, as a virtually intact example of a mid-19th century granite coastal fortification.  Fort Knox also serves as the entry site for the observation tower of the Penobscot Narrows Bridge that opened to the public on 19 May 2007.

Supporting paragraphs: Fort Pownall Stockton Springs, Maine
Answer: Waldo County, Maine