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In page Million Woman March:

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Police estimates ranged from 300,000 to 1 million, whereas organizers estimated an attendance of 1.5 to over 2 million.[1][2][3] A study provided by the University of Pennsylvania that made use of aerial footage, photos, and other research data and information obtained from news and other sources, indicates that the gathering drew at least 500,000 people.[citation needed] The attendees came despite cold temperatures and light rain, with signs throughout the march reading, "I am one in a million" and "Black Women: No more AIDS, abuse, addiction".[2]