The standing room only areas at the United Center are located at the top of the 300 Level sections.
Open Air Bars
The United Center also has 4 open air bars which are located at the bottom of Sections 306, 312, 323, and 329 which also offer some limited space for standing room viewing.
Get to the UC Early!
Gates open 90 minutes prior to puck drop, so be sure to get to the stadium early to get the best SRO spots as they will fill quickly and you will not have a very good view unless you can find a spot at the front of an SRO area.
Blackhawks Shoot Twice Side
Your best options will be the open air bars at Sections 323 and 329, or at the top of any Section from 319-333 as these will be on the side of the ice where the Blackhawks shoot twice.