Duke (Student of Peter Bearman)
CMU (decision sciences - Kathleen Carley (former student of Harrison White) advised Carter)
Northwestern (lots),
UWashington (lots),
Harvard/MIT,
Columbia (Peter Bearman),
UNC (can take classes at Duke),
UCLA, Stanford (McFarland),
Chicago (some - Ron Burt's in the B-school),
Michigan (lots),
Northeastern (CS - David Lazer),
Irvine (Carter (student of Carley),
Faust (wrote the textbook)) for sure,
some at Yale (former students of Peter Bearman),
UMass (former student of Carter's),
U Maryland (HCI - Ben Schneiderman),
Kentucky (Borgati - wrote UCInet),
Indiana (Wasserman)
Kinda depends what you're looking for/what you want to focus on. How quant do you want to be? Do you want to be a pure methodologist? Are you in it for the visualizations or the graph theory?