Based on burial sites found in the 1930s, the area was settled as early as the
Neolithic.
Arxsum was first mentioned in 1462. In 1611, there were 38 farms and the population totalled around 150. In 1709, 25 men out of 53 families were seafarers.
Whaling helped to boost the number of inhabitants to 259 by 1745 (40 mariners). Many ship masters built houses in Archsum after retiring. By 1850, the number of farms had fallen back to 45. By 1952, the population had declined to just 129. Only during the 1930s, when Sylt was fortified by the military, did the number of inhabitants rise briefly (1939: 306, half of which belonged to the
Reichsarbeitsdienst). Until the
Nössedeich was constructed in 1936/37, the area was liable to flooding which destroyed both harvests and homes. ==Geography==