Northumberland 1542 and Hexhamshire in 1572. Islandshire, Bedlingtonshire and Norhamshire were incorporated into Northumberland in 1844. Tynemouth and other settlements in North Tyneside were transferred to Tyne and Wear in 1974 under the Local Government Act 1972. Lying on the Anglo-Scottish border, Northumberland has been the site of a number of battles. The county is noted for its undeveloped landscape of high moorland, now largely protected as the Northumberland National Park. Northumberland is the least densely populated county in England, with only 62 people per square kilometre. Northumberland originally meant 'the land of the people living north of the River Humber'.
County (United States) Atoll, Kingman Reef, and Navassa Island. The remaining 3 islands in the U.S. Minor Outlying Islands have small non-permanent human populations. The least populous county-equivalent with a permanent human population is Swains Island, American Samoa (17 residents). The most densely populated county or county-equivalent is New York County, New York (coextensive with the New York City Borough of Manhattan), with 72,033 persons per square mile (27,812/km) in 2015. The Yukon-Koyukuk Census Area, Alaska, is both the most extensive and the least densely populated county or county-equivalent with 0.0380 persons per square mile (0.0147/km) in 2015. In the 50 states (plus