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Portsmouth was a fishing and shipping village located on Portsmouth Island on the Outer Banks in North Carolina, United States. Portsmouth Island is a tidal island connected, under most conditions, to the northern end of the North Core Banks, across Ocracoke Inlet from the village of Ocracoke. The town lies in Carteret County, was established in 1753 by the North Carolina Colonial Assembly, and abandoned in 1971. Its remains are now part of the Cape Lookout National Seashore.

Ocracoke Inlet was a popular shipping lane during colonial times. Established in 1753, the town of Portsmouth functioned as a lightering port, where cargo from ocean going vessels could be transferred to shallow draft vessels capable of traversing Pamlico and Core Sounds. Portsmouth grew to a peak population of 685 in 1860. Though small, Portsmouth was one of the most important points of entry along the Atlantic coast in post Revolutionary America. In 1846, two strong hurricanes cut Oregon Inlet and deepened the existing Hatteras Inlet to the northeast, making Ocracoke Inlet a less desirable shipping lane by comparison. The waters around Portsmouth's harbor also began to shoal up, hastening its decline as a port. The Civil War was yet another blow as many people fled to the mainland when Union soldiers came to occupy the Outer Banks. Many didn't return after the war had ended and the Village of Portsmouth continued its decline, sped along by the occasional hurricane. The mammoth 1933 Atlantic hurricane season also served as a benchmark in the island's population decline, though more as a focal point of memory and a symbol of decline than the real cause of it. (These were the same hurricanes that led to the depopulation of the barrier islands on the Eastern Shore of Virginia and Maryland.) A further blow was the decommissioning of the US Life Saving Station there in 1937, and closing of the post office in 1959. In 1967 Portsmouth Island and village had already been acquired by the National Park Service, then incorporated into the new Cape Lookout National Seashore. The last two elderly residents, Marian Gray Babb and Nora Dixon, left the island in 1971 after the death of Henry Pigott, who although approximately the same age was essentially their caretaker. In 1978 Portsmouth Village was added to the National Register of Historic Places. Of these the Salter House/visitor center, the one room school, the Methodist Church, the Life Saving Station, Henry Pigott's house and the Post Office/general store are open to the public during the summer. Now, especially during the summers, people often visit the island and camp out overnight on the beach (camping is not allowed in the village). Facilities are very limited with a compost toilet near the Life Saving Station and a restroom in the Salter house/visitors center, with no potable water, food, or electricity available.

Portsmouth is the location of an increasingly well known "homecoming," currently celebrated every two years. The island homecoming has its origins in the early trips made back to the island by families who left prior to the 1960s and was originally affiliated with the Methodist and Primitive Baptist churches, primarily out of Cedar Island, North Carolina, where many inhabitants of Portsmouth had resettled. The homecoming began as a church and family based event but has become increasingly a secular celebration of Portsmouth's heritage, under the aegis of the National Park Service. Many people who have no direct family connection to the island participate in the homecoming.

Portsmouth is reached by a passenger ferry from Ocracoke village. It is also accessible by four wheel drive vehicles, which cross Core Sound by ferry from Atlantic and use the beach and tracks on North Core Banks.

Portsmouth Island lies to the east of North Core Banks, to which it is connected at most states of the tide. The limits of the island are not precisely determined and have varied over time. Older maps use the term for the island between Ocracoke Inlet and Whalebone Inlet (which closed in 1961, now the northern end of North Core Banks.)

According to the Trewartha climate classification system, Portsmouth, North Carolina has a humid subtropical climate with hot and humid summers, cool winters and year around precipitation (Cfak). Cfak climates are characterized by all months having an average mean temperature > 32.0 °F (> 0.0 °C), at least eight months with an average mean temperature ≥ 50.0 °F (≥ 10.0 °C), at least one month with an average mean temperature ≥ 71.6 °F (≥ 22.0 °C) and no significant precipitation difference between seasons. During the summer months in Portsmouth, a cooling afternoon sea breeze is present on most days, but episodes of extreme heat and humidity can occur with heat index values ≥ 100 °F (≥ 38 °C). Portsmouth is prone to hurricane strikes, particularly during the Atlantic hurricane season which extends from June 1 through November 30, sharply peaking from late August through September. During the winter months, episodes of cold and wind can occur with wind chill values < 15 °F (< 9 °C). The plant hardiness zone in Portsmouth is 8b with an average annual extreme minimum air temperature of 17.5 °F ( 8.1 °C). The average seasonal (Dec Mar) snowfall total is < 2 inches (< 5 cm), and the average annual peak in nor'easter activity is in February.

According to the A. W. Kuchler U. S. potential natural vegetation types, Portsmouth, North Carolina would have a dominant vegetation type of Live oak/Sea Oats Uniola paniculata (90) with a dominant vegetation form of Coastal Prairie (20).