The Knights tallied 67 points while Greenfield was second at 59.75.
New Castle scored 57.7 points for third and Zionsville had 53.25 points for fourth.
Northview band director Bob Medworth said the Knights are looking forward to competing in Plainfield in the future.
He said the new facility at the school has a much larger grandstand than before and bands compete on Astroturf.
In addition, Northview won Best Music, Best Visual, Best General Effect, Best Color Guard and Best Percussion at the contest.
The Marching Knights will march in the K-Day Parade Saturday before traveling to Brownsburg for a contest that evening.
Those wishing to view the video podcast of the Marching Knights at Plainfield may do so at www.northviewband.org.
The Clay City Imperial Regiment also competed this weekend, taking part in a contest at Warren Central.
In Class D, Clay City placed first overall.
In addition, band director Mark Ziegler said the Imperial Regiment received awards for best Music, best Visual and best General Effect.
The Imperial Regiment will compete Saturday at both Avon and Greenwood.