Campaigners have claimed support for Welsh independence has reached an 'all-time high'.
It comes Yes Cymru prepares to stage a major rally through Barry later this month.
According to a new survey commissioned by the pro-indy grassroots movement, 41% of voters would back independence if a referendum took place tomorrow.
It also suggested just over 51% of decided voters would give their backing if Wales could rejoin the European Union.
By contrast, the most recent YouGov poll - carried out last September - suggested just 24% supported self governance and 61% were against with 15% undecided.
Yes Cymru claimed its findings pointed to a "growing appetite for constutional change and rising confidence in Wales's ability to succeed as an independent self-governing nation."
Phyl Griffiths, chair of YesCymru, said: "This poll is a milestone moment for the Welsh independence movement."
"It shows that support is growing at a fast pace, up five points from the same company's poll last year, and that nearly half of working-age adults now have confidence in Wales's ability to govern itself."
"We're witnessing a real shift in attitudes, and people across Wales are ready to have a serious conversation about independence."
Support was especially strong among younger voters - with 72% of 25-34 year olds backing Welsh independence, while across 18-64 year-olds, 49% were in favour.
Kiera Marshall, a speaker at the forthcoming march on Saturday 26th April, said: "As a young person living in Wales, I want a future where decisions about our lives are made here, not in Westminster."
"My generation has too often been overlooked and let down by decisions made far away, so it's no surprise to me that 72% of people in my age group now support independence."
"It's no longer a fringe idea, it's now the majority view among my generation in Wales. We want a better, fairer future for our country."
The most recent event was held in Carmarthen last June - while a similar march held in Cardiff in 2022 attracted an estimated 10,000 people.
Plaid Cymru councillor Mark Hooper, one of the organisers of the Barry march, said: "The energy behind this movement is growing, with every march, every conversation, and now, with this poll, the data backs it up."
"The march for independence in Barry on 26th April, just three weeks away, will be a chance for people across Wales to come together and show that this support is real, it's rising, and it's unstoppable."
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