The owner, Eugene McDuffy, 41, 1500 block Seneca St., was charged with persistent disorderly conduct.
Johnny Jackson, 34, 300 block Tiffin Ave., and Darian Agee, 24, 700 block E. Park St., were each charged with disorderly conduct fighting.
Officers went to the Cleveland Road bar around 4:30 a.m. Sunday after a resident heard approximately five shots fired in the DJ Sports Bar parking lot, according to a Sandusky police report.
When officers arrived, they allegedly found Jackson and Agee fighting inside the bar.
Officers located five spent .380 rounds, one spent .45 round, and one unspent .45 round, the report said.
Also located was a bag of marijuana.