"It's not unusual in social movements for there to be break-off movements and different takes on the best way to get to the end goal", said Debbie Walsh, head of Rutgers University's Centre for American Women and Politics.
Elsewhere around the USA, people congregated in Chicago; Houston; Richmond, Virginia; and Rhode Island.
The march from city hall to the Capitol included a group of women who wore red capes and white bonnets like characters from the dystopian novel "The Handmaid's Tale".
United Kingdom cities will hold marches on Sunday, including a London demonstration in support of Time's Up.
Last year, a sea of demonstrators brought downtown Washington to a standstill, in a parade of knitted, pink "pussy hats", an allusion to Trump's videotaped boasts of being able to grope women with impunity.
The London event drew thousands of people despite sleet and snow. Women in the USA illegally, sex workers and those formerly incarcerated are also welcome, she said.
Many of at the march said they attended to remind themselves and the rest of the state that every citizen has power.
Her successor, Sylvester Turner, touted the city's diverse population and leadership roles women hold in his current administration, including the first woman to lead Houston's public works department. They were joined by Italian actress and director Asia Argento, who made headlines after alleging in 2017 she had been sexually assaulted by Hollywood producer Harvey Weinstein in the 1990s.
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Bob Bland, a NY fashion designer who is now one of the organization's national co-chairs, joined the call to action with her own message: "Who wants to join me?!?" she asked.
The tweet falls on the anniversary of the day Trump took office past year.
One thing that hasn't changed, organizers say, is the anger that was on display a year ago.
Johansson said women have been "conditioned" to need approval from men and told the crowd: "For me, moving forward means time's up on the female condition".
Dezie Woods-Jones, the California president of Black Women Organized for Political Action, this morning issued a statement encouraging black women to participate in the march.
The scheduled speakers include Ashley Bennett, a Democrat who was elected Atlantic County, New Jersey, freeholder last November.
In Rome, the 42-year-old Argento addressed the criticism she received after she had spoken up about the abuse she suffered.
As we build upon the momentum of MeToo and Time's Up in this movement, we women have the world's attention so let's seize this moment and catalyse a permanent and cultural shift towards fairer and equal treatment in the workplace, she said.