Nearly three million households in the UK currently don't have broadband access of 2Mbps or above, says the BBC.
Research conducted by broadband website SamKnows on behalf of the broadcaster also revealed that many of these households are not located in rural areas.
In the initial findings of its Digital Britain report, which were released in January, the government revealed plans to ensure every household has access to 2Mbps broadband by 2012.
However, the number of broadband 'notspots' means the government faces a huge task in achieving that goal.
"We had assumed that these notspots were in remote parts of the countryside. That may be where the most vocal campaigners are but there is a high incident of them in commuter belts," Alex Salter from SamKnows told the BBC.
"It prevents flexible working. If the problem is fixed it means a lot more people could work from home which offers a very real way to improve society," added Salter.
However, the broadband website said that less than one percent of UK households couldn't get any form of broadband access.
Sebastien Lahtinen, co-founder of thinkbroadband added: "The speed of broadband in the UK has been rising in recent years, and a growing elite can now browse the net at home with speeds of 50Mbps or even more, but many homes remain with speeds below 2Mbps and in some cases with no connection at all".
Thinkbroadband hopes to map and track areas of the UK where modern broadband is not available and is urging consumers that either have no connection or internet access that is below 2Mbps to log-on to its Broadband notspot website and register.
"The research will highlight the full extent of the problem, and how it could be detrimental to the economy, then possibly government assistance may be more forthcoming," added Lahtinen.
The full findings of the Digital Britain report are expected next month.
See also: 55% think 2Mbps broadband is too slow