You can find USA soccer logos as PNG and 2500×2500 px. on this page
Atlanta United FC 
Chicago Fire FC 
Colorado Rapids 
Columbus Crew SC 
DC United 
FC Cincinnati 
FC Dallas 
Houston Dynamo 
LA Galaxy FC 
Los Angeles FC 
Minnesota United FC 
Montreal Impact 
New England Revolution 
New York City FC 
New York Red Bull 
Orlando City SC 
Philadelphia Union 
Portland Timbers 
Real Salt Lake 
San Jose Earthquakes 
Seattle Sounders FC 
Sporting Kansas City 
Toronto FC 
Vancouver Whitecaps FC