There were early signs across Washington that Saturday's crowds could top those that gathered Friday to watch President Trump's inauguration.
D.C.'s Metro stations were reported to be packed, with many unable to get on trains because they were loaded to capacity with people headed to the National Mall.
A city official in Washington says organizers' turnout estimate for the Women's March on Washington now stands at 500,000, which is more than double their initial predictions.
The march's National Park Service permit estimated a turnout of 200,000, but the District of Columbia's homeland security chief had previously predicted turnout would be higher.