From MTA:

“Going to the Victory Parade for the New York Giants? Please allow enough travel time and keep the following information in mind:

You can take the 4, 5, or 6 to the Brooklyn Bridge-City Hall, Fulton St-Broadway Nassau, Wall St, and Bowling Green stations in Lower Manhattan. However because of expected crowding, Giants fans are urged to use the 1, R or W to Rector St, or the E to World Trade Center. Fans should also consider taking the A, C, 2 or 3 to Chambers St, the 2 or 3 to Wall St, or the J to the Broad St station.

Crowds near the City Hall R, W station, the Park Place 2, 3 station and the Brooklyn Bridge-City Hall 4, 5, 6 station may force trains to bypass these stations during the parade and ceremony at City Hall.

New York City Transit buses and MTA buses that travel to Lower Manhattan are expected to have service changes. Please check www.mta.info for further details (click on the Super Bowl Parade banner).“