N. Mariana Is. is 13 times larger than Norfolk Island.
Area: 464 km2 World Factbook
Population: 51,483 (July 2014) World Factbook
The Northern Mariana Islands, officially the Commonwealth of the Northern Mariana Islands, is one of the five inhabited U.S. island territories. It is one of two territories with "Commonwealth" status; the other is Puerto Rico. Wikipedia
Area: 36 km2 World Factbook
Population: 2,210 (July 2014) World Factbook
Norfolk Island is a small island in the Pacific Ocean located between Australia, New Zealand and New Caledonia, 1,412 kilometres directly east of mainland Australia's Evans Head, and about 900 kilometres from Lord Howe Island. Wikipedia