At least a million Americans poured into the streets on Saturday to participate in the hundreds of March for Our Lives events across the nation.

A review by The Hill of official crowd estimates, offered by city administrations and police departments across the country, found nearly a million total protestors across 62 of the nation’s 100 largest cities. More than three dozen cities where marches were held on Saturday did not offer official crowd sizes, though local media outlets reported thousands or tens of thousands of marchers in those cities.

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Police and city officials counted more than 200,000 marchers at the largest demonstration, on Pennsylvania Avenue in Washington. Another 175,000 people took to the streets in Manhattan, according to New York City police.

Officials in Chicago counted 85,000 demonstrators, and the march in Los Angeles brought out another 55,000 people. In Boston, 50,000 people took to the streets, and 30,000 people joined in both Atlanta and Pittsburgh.

In Parkland, Fla., the site of the Marjory Stoneman Douglas High School school shooting, 20,000 people demonstrated — although many of the students from the school itself were participating in the march in Washington. A hockey team from the high school was participating in a tournament in the Twin Cities, where police estimated 18,000 demonstrators marched.

More than 10,000 people showed up at March for Our Lives events in Houston; Phoenix; Philadelphia; Austin, Texas; Nashville, Tenn.; Portland, Ore., Milwaukee, Cleveland, Tampa, Fla.; St. Louis, St. Paul, Minn.; and Cincinnati.

Some of the marches on Saturday were smaller affairs. Just 300 marchers turned out in Wichita, Kan., and Corpus Christi, Texas, and 400 showed up in Stockton, Calif., and Fort Wayne, Ind.

But the actual number of demonstrators who showed up to rally against gun violence in the wake of the massacre in Parkland is likely much higher than a million. Officials in cities like Seattle, Denver, Dallas and San Francisco — where local media reported tens of thousands of marchers — did not offer estimates of crowd sizes.

In total, March for Our Lives events took place Saturday in more than 800 cities, both in the United States and around the globe. Hundreds of protestors showed up outside the U.S. Embassy in London; protests also took place in Paris; Buenos Aires, Argentina; and Sydney.