Apparently there were about 375,000 people protesting the Iraq War in New York in 2003 compared to about a million people marching for women’s safety in 2004 in DC

In the years since there have been about 5 protests the same or much larger than that. In 2017 2.3 Million people protested the Trump inauguration, and protestors also showed up for Trump’s 2025 inauguration which was held indoors for reasons including harsh snow. The exact number estimates for the 2025 inauguration protest and the 50501 protests are unknown at the moment, but it is occurring in all 50 states which is comparable to the George Floyd protests.