Between 2001 and 2003, there was a marked increase in UK membership, with the creation of the Hull General Membership Branch.
During this time the Hull branch had 27 members of good standing; at that time the largest branch outside of the United States.
By 2005, there were around 100 members in the United Kingdom.
For the IWW's centenary, a stone was laid (51°41'598N 4°17.135W Geocacher), in a public access forest in Wales, commemorating the centenary of the union.
As well, Sequoias were planted as a memorial to US IWW and Earth First!
activist Judi Bari.
2006 saw the IWW formally registered by the UK government as a recognised trade union.

The IWW currently has a presence in several major urban areas as well as regional centres, with chartered branches in London, Glasgow (Clydeside GMB), Bradford, Bristol, Dorset, Edinburgh, Ireland, Leeds, Leicestershire, Manchester, Northamptonshire and Warwickshire, Northumbria, Nottingham, Reading, Sheffield, Wales, in the Tyne and Wear and West Midlands areas.

Overall, membership has increased rapidly; in 2014, the union reported a total UK membership of 750, which increased to 1000 by April 2015.
In 2016, the 1,500 member limit was passed.
Between 2001 and 2003, there was a marked increase in UK membership, with the creation of the Hull General Membership Branch. During this time the Hull branch had 27 members of good standing; at that time the largest branch outside of the United States. By 2005, there were around 100 members in the United Kingdom. For the IWW's centenary, a stone was laid (51°41'598N 4°17.135W Geocacher), in a public access forest in Wales, commemorating the centenary of the union. As well, Sequoias were planted as a memorial to US IWW and Earth First! activist Judi Bari. 2006 saw the IWW formally registered by the UK government as a recognised trade union.
The IWW currently has a presence in several major urban areas as well as regional centres, with chartered branches in London, Glasgow (Clydeside GMB), Bradford, Bristol, Dorset, Edinburgh, Ireland, Leeds, Leicestershire, Manchester, Northamptonshire and Warwickshire, Northumbria, Nottingham, Reading, Sheffield, Wales, in the Tyne and Wear and West Midlands areas.
Overall, membership has increased rapidly; in 2014, the union reported a total UK membership of 750, which increased to 1000 by April 2015. In 2016, the 1,500 member limit was passed.
Industrial Workers of the World