[The Original Ape]

I think if you'd separated the question like: Which sorority/fraternity is known best in the community for service vs. social, some of these answers may have been different. As for Ohio(North of Columbus!), it's:

Sororities involved in the most Community service:

Delta Sigma Theta
Alpha Kappa Alpha
Zeta Phi Beta
Sigma Gamma Rho

Popularity: Same Order

Fraternities involved in the most Community service:

Alpha Phi Alpha
Kappa Alpha Psi
Phi Betta Sigma
Omega Psi Phi
Iota Phi Theta

Popularity:

Alpha Phi Alpha
Kappa Alpha Psi
Omega Psi Phi
Phi Beta Sigma
Iota Phi Theta

Alumni-Both Sororitie and Fraternities:
Alpha Phi Alpha and Delta Sigma Theta