An insular area of the United States is a U.S. territory that is neither a part of one of the 50 states nor of a Federal district. Article IV, Section 3, Clause 2 of the United States Constitution grants to United States Congress the responsibility of overseeing these territories,[a] of which as of 2018 there are 14, 3 in the Caribbean Sea and 11 in the Pacific Ocean. These territories are classified by whether they are incorporated (by Congress extending the full body of the Constitution to the territory as it applies to the several states) and whether they have an organized territorial government established by the U.S. Congress through an Organic Act. All territories but one are unincorporated, and all but four are considered to be unorganized. Five U.S. territories have a permanent, nonmilitary population. Each of them has a civilian government, a constitution, and enjoys some degree of local political autonomy.
Congress has extended citizenship rights by birth to all inhabited territories except American Samoa, and these citizens may vote and run for office in any U.S. jurisdiction in which they are residents. The people of American Samoa are U.S. nationals by place of birth, or they are U.S. citizens by parentage, or naturalization after residing in a State for three months. Nationals are free to move around and seek employment within the United States without immigration restrictions, but cannot vote or hold office outside American Samoa.
Residents of the five major populated insular areas do not pay U.S. federal income taxes but are required to pay other U.S. federal taxes such as import and export taxes, federal commodity taxes, social security taxes, etc. Individuals working for the federal government pay federal income taxes while all residents are required to pay federal payroll taxes (Social Security and Medicare). According to IRS Publication 570, income from other U.S. Pacific Ocean insular areas (Howland, Baker, Jarvis, Johnston, Midway, Palmyra, and Wake Islands, and Kingman Reef) is fully taxable as income of United States residents.
The U.S. State Department also uses the term insular area to refer not only to territories under the sovereignty of the United States, but also those independent nations that have signed a Compact of Free Association with the United States. While these nations participate in many otherwise domestic programs, and full responsibility for their military defense rests with the United States, they are legally distinct from the United States and their inhabitants are neither U.S. citizens nor nationals.
The following islands, or island groups, are considered insular areas:
The people of Puerto Rico will continue to be exempt from Federal income taxes on the income they derive from sources within Puerto Rico, and into their treasury, for appropriation and expenditure as their legislature may decide, will be deposited the proceeds of United States internal revenue taxes collected on articles produced in Puerto Rico and the proceeds of United States tariffs and customs collected on foreign merchandise entering Puerto Rico.