Hollywood Toledo earned $33m for the month, a record for an individual casino in the state.
Jack Cleveland and Hollywood Columbus both brought in $18m, while Hard Rock Cincinnati earned $17m.
The previous statewide monthly revenue record was $84m in March 2013.
Slots accounted for $63m of win. Table revenue accounted for $23m.
Ohio’s casinos reopened on 14 June after a three-month closure amid the coronavirus pandemic.