TOEFL (Courtesy from greenoak @ GC)

Notes:
1. All requirements are for TOEFL iBT format, unless specified otherwise
2. All information was taken from official schools' sites.
3. Even if school does not have an official cut-off score, or if this score seems ridiculously low, it is an applicant's interest to check an average score of the accepted students in order to form a realistic understanding of what is required.
4. Overall, it seems you will be OK with 100 for the vast majority of schools, but you will need closer to at least 110 for the most competitive ones.

TOEFL Requirements for US Schools
School	TOEFL Score	Notes
Harvard	109+	strongly recommended by adcom
Stanford	100
Wharton	Required	no cut-off score; average is given as 111
MIT	Not Required	may be included if an applicant wishes to do so
Chicago Booth	104	otherwise ‘admission would be contingent upon meeting the minimum scores or other language requirements’ – info from their site
Kellogg	Required	no cut-off score specified
Columbia	Required	no cut-off score specified
Tuck	Required	no cut-off score specified
Berkeley (Haas)	68	note that average given for reference is 113
Michigan (Ross)	100
Duke (Fuqua)	Required	no cut-off score specified
Darden	100	not a strict requirement
Yale	100
NYU Stern	Required	no cut-off score specified
Cornell Johnson	Required	require 600 for old paper-based tests (with 5 in TWE), which corresponds to 100 in new format (with 25 in Writing)
UCLA (Anderson)	87	they note that you should have a good excuse for anything below 100
CMU (Tepper)	Required	no min score for TOEFL iBT is given, but they specify 600 for old Paper-Based test, so I think it’s 100 for iBT