Civic Center Park, where roughly 100 to 150 people on each side were separated by a makeshift orange barrier.
They say demonstrators left Berkeley's Martin Luther King Jr. They said there were no arrests and it was peaceful.
There is no law requiring presidents to release their tax returns, but Mr Trump has found himself under public pressure and some information from a 2005 tax return was leaked to the media last month.
On the campaign trail, Trump insisted he would release his tax returns once an audit was complete, then dismissed the option once in office.
"Trump's team says the election proved no one cares about his taxes".
"I pay my taxes and think he should reveal them and what his ties are", said Desloover, who was part of an estimated 10,000 people who participated in the Women's March earlier this year in Lansing. They called on supporters to "show Donald Trump that he owes us transparency".
Demonstrators participate in a march and rally to demand President Donald Trump release his tax returns, Saturday, April 15, 2017, in NY. Brad Hoylman, who helped comedian and advocate Sarah Silverman make signs before the event began, were among the march's confirmed speakers. U.S. Rep. Pramila Jayapal, D-Seattle, ended her speech by telling the crowd of about 2,000 that Donald Trump's assertion that "only reporters" care about his tax returns is "fake news".
Trump was not in the city during the demonstration; he is again spending the weekend at his Mar-a-Lago estate in Palm Beach, Florida.
The protests were timed to coincide with the traditional April 15 deadline for annual U.S. tax filings. Protesters marched across the bridge that divides West Palm Beach and Palm Beach, chanting and hoisting signs that read "Don the Con", "Go back to New York" and "Show your taxes!"
Marches in Raleigh, Charlotte and Mooresville - where Trump has a golf course bearing his name - were held on the day Americans normally must complete their annual tax filings.
Presidents are not required to release their tax returns.
The protests, which included a march on Mar-a-Lago - Trump's private Florida resort where he is spending the weekend - also featured prominent USA leaders, including Rep. Maxine Waters (D-Calif.).
In a Quinnipiac University poll released on April 4, more than two-thirds of the respondents said Trump should publicly release his tax returns.
"Trump must immediately release his full tax returns, as all presidents and major-party presidential candidates have done for the last 40 years".
In Last Vegas, police said a broadcast photojournalist for KLAS-TV was arrested and cited for trespassing and obstructing during a protest at Trump International Hotel near the Strip.
Protesters wielded signs and marched up and down the street.
"We're marching on Washington DC and around the country to ask Donald Trump: WHAT ARE YOU HIDING?" the organisers said on their website.
Two of the biggest tax marches took place in NY and Los Angeles, with each drawing about 5,000 people, according to estimates by Reuters reporters. Democrats in Congress want the House Ways and Means Committee to vote in favor of Trump making his returns public, but Republicans have rebuffed those efforts. Dan Baker, a retiree from Boynton Beach, Fla., said, "I've always been a passive person". The deadline this year is extended to Tuesday.
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