An FBI spokesperson confirmed agents executed the warrant, but no other details were released.
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Agents in dark blue FBI windbreakers carried white cardboard boxes out of the house, which is about a mile from Atlantic City's casinos. Earlier, they removed a computer and a printer, stashing the items in dark sport utility vehicles.
Outside the home, FBI agent Jessica Weisman said, "We are here in an official capacity, executing a search warrant. That's all we can say."
IRS agents also were on the scene, a spokesman for the service's criminal investigations unit said Monday.
Gilliam emerged from the home shortly after 12:30, ignoring shouted questions from reporters. He then got into his personal sport utility vehicle and drove away.
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The raid comes days after prosecutors said they will not pursue criminal charges against Gilliam and Atlantic City Councilman Jeffree Fauntleroy in regards to a brawl last month outside the Golden Nugget Casino.
Video of fight involving Atlantic City mayor released
It's not clear why the two went toe-to-toe with a group, which also involved women, but it was all caught on camera.
There is no word at this time on whether the raid is connected to this incident.
A man driving a car with the Atlantic City logo on its sides drove slowly past Gilliam's home, extending his middle finger to reporters gathered outside.
Gilliam, a Democrat, is in his first year as mayor. The former two-term city councilman defeated Republican incumbent Don Guardian in November 2017 in a contentious election marked by allegations of voter fraud by Guardian.
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In April, a judge threw out a criminal complaint against Gilliam over the alleged theft of a $10,000 check from the Atlantic City Democratic Committee. The committee had accused Gilliam and a former campaign manager of unlawful taking when Gilliam deposited the committee's $10,000 check into his campaign account.
Gilliam said it was a mistake and later returned the money.
(The Associated Press contributed to this report)
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