It was also the 85th season of FIFA-sanctioned soccer in the United States, and the 19th with a national first-division league.
The season began on March 22 and concluded with MLS Cup on October 26.
The top four teams from each conference qualified for the MLS Cup Playoffs.
The conference semifinals and finals were played as a best-of-three series, and the winners advanced to MLS Cup.
The team with the most points in the regular season was awarded the MLS Supporters' Shield.