Both men were from out of state, police said.
Investigators found evidence of drug use at the scene, but the official cause of death will be determined through an autopsy.
Fair employees undergo mandatory drug testing before they are hired, fair president Mickey Day told WJZ. He also said the two men had been involved with the Howard County Fair for several years.
"At the fair association, we've never experienced anything like this, so we're quite concerned," Day said.