ESPN.com's Pierre LeBrun wrote he was torn between the Blackhawks and Penguins for No. 1.
"I was mighty tempted to put Pittsburgh first in our rankings, but I just can't demote a Chicago team that has only three regulation losses on the season," LeBrun wrote. "Three! Still, the Pens are charging mighty hard."
The Penguins are on a 12-game winning streak and lead the Eastern Conference with a 25-8-0 record and 50 points.
The Blackhawks are 24-3-3 with an NHL-best 51 points.