|ISO3166-1 Codes||UM, UMI, 5811|
“The Kingdom of Hawaii claimed the atoll in 1862, and the US included it among the Hawaiian Islands when it annexed the archipelago in 1898. The Hawaii Statehood Act of 1959 did not include Palmyra Atoll, which is now partly privately owned by the Nature Conservancy with the rest owned by the Federal government and managed by the US Fish and Wildlife Service. These organizations are managing the atoll as a wildlife refuge. [...] Managed by the Fish and Wildlife Service of the US Department of the Interior.”
CIA's The World Factbook (2013)5
As a territory of the USA I do not have many specific statistics for this territory in its own right.
There isn't much information in the database for Palmyra Atoll, most likely because it is either a part of another country (i.e., a territory or possession) and therefore most international statistics are counted for the country as a whole, or, this is such an exotic place that little data exists about it.