Timothy Shea's sentence was the longest imposed over the "We Build the Wall" campaign, which federal prosecutors said raised more than $25 million from hundreds of thousands of donors.
Two other defendants, who pleaded guilty, received shorter prison terms.
Former Trump adviser Steve Bannon was also charged in the case, but Trump pardoned him in the final hours of his presidency.
Two other defendants, the campaign's leader Brian Kolfage and Andrew Badolato, pleaded guilty and were sentenced in April to 4-1/4 years and three years in prison, respectively.
Bannon was criminally charged last September by Manhattan District Attorney Alvin Bragg with state law violations arising from the wall campaign.
Persons:
Donald Trump, Greg Abbott, Callaghan O'Hare, Donald, Timothy Shea's, Steve Bannon, Trump, Shea, Analisa Torres, Torres, Brian Kolfage, Andrew Badolato, Bannon, Attorney Alvin Bragg, Luc Cohen, Matthew Lewis
Organizations:
Texas, REUTERS, Trump, District, U.S, Prosecutors, Manhattan, Attorney, Thomson
Locations:
U.S, Mexico, Pharr , Texas, Manhattan, Rock , Colorado, New York