Which undergraduate programs offer a tutorial system, like at Oxford?
Look into Williams. For further options, consider colleges with an ample selection of courses identified as “seminars,” which may offer aspects similar to that of schools with designated tutorials.
@oak2maple, As @merc81 notes, Oxford-style tutorials, defined as two students and one professor interacting over the course of a semester. are a hallmark of Williams College. There may be other U.S. colleges that offer the same format, but I don’t know of any, at least to the extent at which they are available at Williams.
From Williams’ website:
Williams is most known for this. Also check out Sarah Lawrence, St. John’s College, New College of Florida, and the Honors Tutorial College at Ohio University.