Aaron Travis Daniels, 20, of Columbus, was arrested November 7 as he tried to leave his city to travel to Libya to join the militant group, the department said in a statement.
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A criminal complaint against him said Daniels sent $250 in January 2016 to an Islamic State operative and had communicated his commitment to violent overseas war.
Daniels, known also as Harun Muhammad or Abu Yusef, pleaded guilty in U.S. District Court in Columbus and faces up to 20 years in prison when he is sentenced, officials said.
"This case demonstrates how terrorist activities abroad can reach into our local communities," U.S. Attorney Benjamin Glassman said in a statement.
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Daniels' federal public defender could not be immediately reached for comment.
At the time of his arrest, Daniels was the latest in a string of people arrested in the United States over accusations they planned to join or help Islamic State militants, who largely operate in Iraq and Syria.
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