Jefferson provided 24 points with 10 rebounds and Williams went 6-of-7 from 3-point range for Utah, which has used the hot streak to grab sole possession of the Western Conference's eighth and final playoff spot.
The Jazz hold a one-half game lead over the Los Angeles Lakers for eighth place.
Damian Lillard added 17 points for Portland.
LGBT community has 'bullied the American people': Bachmann
McPhee, Cokas 'working on their marriage' after affair