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 Table 7-1. First Census Participation for Puerto Rico and the Outlying Areas The Census Bureau included two other entities as Outlying Areas in earlier decennial censuses:
 * The Canal Zone (or Panama Canal Zone) was first enumerated by the United States in 1904, after it came under U.S. jurisdiction by treaty with Panama on November 18, 1903. It was included in the decennial censuses from 1920 through 1970. On October 1, 1979, the United States transferred sovereignty over the Canal Zone to Panama in accordance with the terms of a treaty signed in September 1977 and ratified the following April.
 * The Trust Territory of the Pacific Islands (TTPI) was administered by the United States as a United Nations trusteeship beginning July 18, 1947. The TTPI included the Marshall Islands, the Caroline Islands, and the Northern Mariana Islands. The U.S. Navy conducted a population census of the TTPI in 1950; the Office of the High Commissioner of the TTPI conducted censuses in 1958 and 1973; and the Census Bureau conducted the censuses in 1970 and 1980. However, for the 1980 census, the Census Bureau reported the Northern Mariana Islands as a separate entity rather than with the other entities that composed the TTPI. On November 3, 1986, a presidential proclamation cancelled the trusteeship agreement as it applied to the Northern Mariana Islands, and that entity became a commonwealth of the United States. As a result of the proclamation, effective November 9, 1986, the Federated States of Micronesia—comprising the TTPI administrative districts of Kosrae, Ponape (now Pohnpei), Truk (now Chuuk), and Yap—and, retroactive to October 21, 1986, the Republic of the Marshall Islands, became freely associated States, independent of the United States except for U.S. responsibility for their security and defense. On December 22, 7-2Puerto Rico and the Outlying Areas