According to sportsfacts.org (nice name), these are the players who led the NFL in penalties at their position:
Cross-checking with NFLPenalties.com, these seem to be mostly accurate.
First looking at the offensive tackle positions, I found that Bradley Sowell and George Fant each had seven. Ereck Flowers had 13, Taylor Lewan had 12. But NFLPenalties also lists the Bucs’ Donovan Smith also with 13 penalties. Part of the discrepancy here will be if the penalties were declined or offsetting. More on that later.
At guard, David DeCastro had 12 penalties, and Pro-Football-Reference confirms 10 penalties for Vadal Alexander, which is impressive because he only played in nine games and had just five starts. Germain Ifedi had eight penalties, including three false starts against the LA Rams in December. Mark Glowinski had six penalties, including four holding calls. Ifedi wasn’t called for holding all season.
At center, Justin Britt had four penalties. NFLPenalties says that Jason Kelce had one more penalty than Richie Incognito, with eight. Also, Incognito is a guard? PFR says it’s nine for Kelce, including six holding penalties. There’s reason to believe the Eagles will be releasing Kelce this year and this would help explain why.
At defensive end, NFLPenalties says Dante Fowler and Jerry Hughes tied with one other player in the league for the lead in penalties. That player: Cassius Marsh. NFLPenalties says all three had eight penalties, and Marsh was called offside four times, roughing the pass once (he disagreed with it, obviously), facemask, unsportsman like conduct, and a neutral zone infraction. But Michael Bennett was actually flagged 10 times, with two of them being declined and one of them being offsetting.
Aaron Donald, Jordan Phillips, and Ndamukong Suh all had at least eight penalties to lead the defensive tackle position. Phillips and Suh are teammates by the way. They combined for 17 penalties. To his credit, and against his reputation, Suh hasn’t had a penalty that cost his team more than five yards since 2014. He’s mostly flagged for neutral zone infraction, encroachment, and offsides. His last unsportsmanlike penalty came in 2011. Seattle didn’t have a defensive tackle with a notable penalty count; Jarran Reed had two.
Cornerback seems to be a little tricky. Robert Alford actually now has 14 penalties, including the playoffs, with three of them being overturned or offsetting. That’s an insane amount and seven of them were for pass interference. Look out for a big PI called in the Super Bowl. But while Detroit’s Nevin Lawson is listed as the other corner, he only has six flags but they went for 134 yards. The Raiders DJ Hayden and Steelers Artie Burns each had 12. Burns has actually been flagged 16 total times, including twice in the playoffs.
Richard Sherman was flagged nine times, with one of them being declined. DeShawn Shead was flagged three times, including once in the playoffs, and one of them was declined. Jeremy Lane was flagged five times, including twice for PI and twice for unnecessary roughness.
K.J. Wright had three penalties, one offsetting, while Bobby Wagner had two. Former Seahawk linebacker Malcolm Smith had eight, tied for the most with Willie Young.
I don’t know if I have much else of note to add to this list, but if you’re curious about something else re: penalties, I’ll see what I can find out.