““In 2000, the population was 1,061 up from 885 in 1990; of this total, 498 lived in the unincorporated portions of the township. The third smallest township in the county with 13,622 acres (55 km²), it was named for General Nathaniel Massie; it is the only Massie Township statewide. It is the home of the Ohio Renaissance Festival and Caesar Creek State Park.””

“It was created by the Warren County Commissioners on October 10, 1850 from parts of Wayne and Washington Townships. From 1806 to 1815 it was part of Eaton Township. The original boundary was “commencing at the point where the road from Wilmington to Lebanon crosses the Warren and Clinton County line, thence with said road to the line between Paul Vandervert and John Wilkinson; thence north, 80½ degrees west to the southwest corner of THomas J. Fryer’s 50 acre (200,000 m²) lot, in the line of Peter Mullenburgh’s west survey; thence on said line to the corner of James Currie’s survey; thence north, 30 degrees east to a sugar tree on the bank of Caesars Creek, opposite to the mouth Flat Fork; thence north, 10 degrees east to the Little Miami River, thence up said river to the Greene County line.” On June 11, 1851, the boundary was changed to “commencing at the township line between Massie and Wayne, where it crosses Clement Reed’s survey, thence running in a northeastern direction on the back line of the river survey, to the corner of Richard Anderson’s survey, and thence on the southwest line of said survey to Caesars Creek, thence up said creek to the Clinton County line, and the part taken from Massie township to be attached to Wayne, where it formerly belonged.”
A large part of the township was submerged in the 1960s and 1970s with the damming of Caesars Creek by the U.S. Army Corps of Engineers.”