Sebastian Grazzini and Josh Wolff scored in a 1-1 result, which brings Chicago to an MLS record of 15 draws in a season.
Second half strikes from Sebastian Grazzini and Josh Wolff accounted for a 1-1 scoreline at Toyota Park, giving the Fire its 15th tie of the year- a new single-season MLS record.
The Fire had the better of the first half, out-shooting the visitors 7-0 as the D.C. United defense was routinely exposed. The home side, however, could not find a finishing touch.
Dominic Oduro had several chances to grab the opener, but his curled shot struck the far post early in the half and later he was guilty of missing a sitter after being perfectly set up at the far post by Patrick Nyarko.
United was dealt a blow when, on the stroke of halftime, goalkeeper Bill Hamid pulled up lame with a hamstring problem after taking a free-kick, and he had to be replaced in the second half by Steve Cronin.
Chicago grabbed the lead in the 59th minute when a Patrick Nyarko cross was not fully cleared by Daniel Woolard's header, and the ball fell kindly to Grazzini, who lashed a left-footed volley home from 10 yards out.
Against the run of play, D.C. grabbed the equalizer in the 73rd minute through second-half sub Josh Wolff. Santino Quaranta controlled the ball at the top of the box and fed through to the striker, who may have been a half-step offside. That didn't faze Wolff though, as he fired home off the underside of the bar and evened the match.