Parry reached No. 45 in the world after a four-shot win over an elite field at Sahalee Country Club for his first title in 236 starts on the PGA Tour.
Tiger Woods, who came up short in his bid for a fourth straight NEC title, remained firmly entrenched atop the rankings. He was followed by Phil Mickelson, 2002 British Open winner Ernie Els and his fellow South African Retief Goosen.
Spain's Sergio Garcia held onto to his fifth-place ranking from last week while David Toms stayed put at sixth. Davis Love III exchanged places with Padraig Harrington to come in seventh.
Vijay Singh remained at No. 9 followed by Jim Furyk, who kept his 10th place ranking. Nick Price moved up one to come in at 11th while David Duval fell one more spot to 12th.
Michael Campbell, Bob Estes, Chris DiMarco and Rocco Mediate all held their positions from the previous week.
Rocco Mediate remained at No. 16. He was followed by Darren Clarke, Colin Montgomerie and Angel Cabrera, who each kept their spots.
Justin Leonard rounded out the top 20 while 2002 PGA Champion Rich Beem moved up five spots to come in at 21 after he finished tied for sixth at the NEC Invitational, his third top-10 finish in as many starts.
Fred Funk continued his fine play with a share of second at the NEC Championship. He rose 14 places to No. 36 while co runner-up Robert Allenby jumped 10 spots to 24th.
Adam Scott cruised to a 10-shot victory at the Scottish PGA Championship Sunday. The Australian, who won for the third time on the European Tour, climbed 12 rungs to 49th.