Carlos Vela shattered the record set by Josef Martinez (31) in 2018 as LAFC ended their regular-season campaign with a 3-1 win.
Carlos Vela took his tally to 31 goals this MLS season during Los Angeles FC's draw with Minnesota United.
Zlatan Ibrahimovic scored and provided an assist as LA Galaxy secured a place in the MLS play-offs.
Wayne Rooney provided an assist in DC United's win over Seattle Sounders in MLS.
Keaton Parks and Alexandru Mitrita helped New York City past the San Jose Earthquakes.
Josef Martinez scored in his 13th successive league match but Atlanta still lost to Philadelphia in Saturday's top-of-the-table clash.
Kacper Przybylko starred as Philadelphia heaped further misery on DC, who suffered their third consecutive defeat on Saturday.
LAFC star Carlos Vela took his goals and assists tally to a combined 39 this season on Saturday – a new MLS record.
Alejandro Bedoya made a statement during Philadelphia Union's win over DC United: "Congress, do something now. End gun violence. Let's go!"