Valind does not exactly have much of a cult in Sartar. His shrines (all in great temples to Orlanth) get tended by whatever initiates wander there.
Now among the Tarsh Exiles, there are some 500 Valind worshipers, likely due to the long snow at Wintertop. There they worship the God of Winter, whose snows and cold winds no doubt have aided Wintertop to keep its independence.