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<p>Yes, Guam is definitely a United States territory. </p>
<p>[DOI</a> Office of Insular Affairs (OIA) - Guam](<a href=“http://www.doi.gov/oia/Islandpages/gumpage.htm]DOI”>http://www.doi.gov/oia/Islandpages/gumpage.htm) </p>
<p>I didn’t see a convenient answer to your question from a Google search, but why would you have any doubt if you are a resident of Guam?</p>