Organizers anticipate exceeding the million-person goal they set for themselves in what has been dubbed the "March for Women's Lives" in Washington, D.C., on Sunday.
The pro-choice march is expected to be the largest of its kind.
Charles Cook, community specialist for Planned Parenthood Federation of Michigan, said the unofficial count rises every week.
"It's already well over a million," he said.
More than 1,200 Michigan Planned Parenthood supporters will be part of an estimated 2,500 Michiganians visiting the nation's capital.
Students from several MSU organizations will hop on buses and into cars to drive about ten hours to support the cause. Members of Women's Council, Students for Choice and Voices for Planned Parenthood all are finishing up preparations for traveling to Washington for the weekend's activities.
"I'm really excited for this once-in-a-lifetime opportunity to join thousands and thousands of pro-choice activists," Women's Council co-president Laura Sorensen said. "Right now is such a vital time to be showing our support for this cause."
Last weekend, MSU Students for Life sponsored a pro-life rally to voice the views of those in opposition to abortion.
More than 100 people came out to support the cause at Wells Hall, where several groups handed out information and a band entertained inside one of the auditorium-style classrooms.
"It was a really great turnout," event coordinator and Students For Life President Katie Wilcox said.
An on-campus, pro-choice rally also will be held for those who couldn't make it to Washington, D.C.
Bus caravans are leaving from Marquette, Traverse City, Grayling, Flint, Detroit, East Lansing, Ann Arbor, Grand Rapids and Kalamazoo.
The primary supporters of the march nationwide are the American Civil Liberties Union, the Planned Parenthood Federation of America, the National Organization for Women, NARAL Pro-Choice America, Black Women's Health Imperative, Feminist Majority Foundation and the National Latina Institute for Reproductive Health.
More than 1,000 organizations are supporting the march. The NAACP, for the first time in its 95-year history, is co-sponsoring a pro-choice march.
Students for Choice President Elizabeth Wong said she's excited to see the city and participate in the march with a million other women.
"I've never done this type of thing on such a large scale," she said. "It's going to be really interesting."
