According to figures from the Department of Work and Pensions, there were 6,580 migrants entering Bradford between April 2006 to March 2007 compared to 4,650 in 2005/06.

A breakdown on figures for the period April 2006 to March 2007 show 3,490 workers came into the parliamentary constituency of Bradford West, 1,270 in Bradford North, 880 in Bradford South, 510 in Keighley and a further 420 in Shipley.

Poles accounted for 30 per cent of the total (1,950), a further 24 per cent (1,600) from Pakistan, and 12 per cent (830) from Slovakia.

Across West Yorkshire, only Leeds handed out more national insurance numbers with 8,470.

Keighley MP Ann Cryer said she was not surprised by the figures but said people should be more concerned about the number of people coming in who do not have national insurance numbers.

She said: "There will be many people, including wives and husbands brought in who do not work.

"My view has always been people coming in to the country to work must have a grasp of English, not funded at the expense of the tax-payer.

"If someone chooses to come here to work they should be able to speak the language, if only to ensure they know their rights. NI numbers should not be given without some obligations.

"People will be paid low wages and I am concerned it is underwriting the indigenous community.

"We want to encourage integration and make sure we stamp out racism and xenophobia."

Shipley MP Philip Davies said the 1,500 16 to 18-year-olds not in education, employment or training in Bradford could be taking the jobs.

He said: "There are 1.25 million people across the country who are not in education, employment or training, effectively doing nothing at the same time as we have people coming in in large numbers from Eastern Europe who are doing low-paid, unskilled work. The young people doing nothing could do that.

"We should change the welfare system so more people have to work and there would not be the need for all these migrant workers coming into the country."

Sandy Needham, chief executive of Bradford Chamber of Commerce, defended the workers saying they filled vacancies that otherwise might be empty. She said: "In previous meetings when this issue has come up the feedback from employers has been positive. They have been able to recruit people when they have not otherwise been able to fill the vacancies.

"There are vacancies, but not enough people to fill these vacancies. As long as people are allowed to work in this country, businesses are not seeing them as a problem but as a benefit."

The Tories said the increase was "unsustainable" and pushed public services to breaking point.

Bradford Council has also raised the issue with the Government, saying it needs to know the exact number of migrants to the district so it can secure funding for providing additional services including school places.

David Davis, Shadow Home Secretary said: "These figures prove immigration is still running at unsustainably high levels.

"This is the direct result of the Government's open door' approach which has totally failed to consider the impact of immigration on public services, housing and community cohesion."

The Government has pledged £33billion over three years for training initiatives designed to plug the country's skills gap.

Jo Miller, Bradford Council's deputy chief executive, said: "Bradford has a long history of welcoming economic migrants from far and wide - including such countries as Germany, Poland, Ireland, the West Indies, Pakistan and more recently from the newly-expanded European Union.

"Diversity is one of Bradford's strengths and we should use all the skills, languages and cultural attributes migrants bring to the district's advantage.

"The figures released by the Department for Work and Pensions are roughly in line with what the Council believes.

"It is important we know the exact figures for the district and we have raised this with the Government and will continue to do so in order for us to obtain the necessary financial support to cope with providing additional services."

The Council is already having to plan to build new primary schools in parts of Bradford where the numbers of pupils are growing due to migration.