I hear pitch in place of throw here in New England. My mom uses pitch sometimes. She also used it when discarding cards, "I'm going to pitch these cards", which you also hear British bridge players say.
Here's a very region specific term: "pitch-in" - a word for a potluck dinner. The "Dictionary of American Regional English" reports that Indiana is virtually the only place in the US you hear this usage for potluck. Here the rest from DARE:
basket dinner [chiefly Midl, occas Sth]
carry-in [chiefly IL, IN, OH]
covered-dish meal [widespread exc Pacific, Upper MW, WI, MI
dinner on the ground(s) [chiefly Sth, S Midl]
hot dish [scattered]
pitch-in dinner [chiefly IN; also MT]
potluck meal [widespread, but less freq Sth, C Atl, NY]
scramble dinner [esp nIL]
tureen dinner [chiefly Upstate NY, wPA]