I count 531ish (couple sectionals didn't have entry grids on baums so I estimated those).To get the number of OHSAA recognized teams from last season, you would need to count the number of teams who had at least 7 wrestlers compete(wrestled in a match, look at bracket) at the Sectional Tournament in 2019.

187 D1

178 D2

166 D3

Of course there are more "teams" listed in D3 than D2 and D1 because there are far more teams with less than 7 in D3 than the others.