The stats come as Labour demanded that Theresa May guarantees the rights of more than three million EU migrants living in the UK.
There are more than 100,000 outstanding applications from European citizens “currently in process” of securing British residency since early July 2016 – a huge surge from June 2015’s figure of 37,618.
The figure, to be published by the Home Office today, also includes EU citizens who have applied for residency passes for their non-EU relatives.
Corbyn’s party argue failure to secure the rights of EU migrants living in the UK could lead to the 1.2million Britons who live across the crumbling Brussels bloc being booted out when Article 50 is finally triggered.
Labour’s Keir Starmer said: “It’s becoming increasingly apparent to me from my discussions in Brussels with those that are likely to be involved in the negotiations that they are very concerned about the fact that we are not giving comfort and status to their citizens.
“They have said to me, pretty well in terms, the UK should sort this out before March and that would ensure that the article 50 negotiations got off to a much better start than they will otherwise do so.”
Theresa May has defended the Government’s position during Prime Minister’s questions last week.
Defending herself from a question posed by fellow Tory Peter Lilley, she said: “I think the reaction that we have seen shows it was absolutely right for us not to do what the Labour party wanted us to do, which was simply to give away the guarantee for rights of EU citizens here in the UK. As we have seen, that would have left UK citizens in Europe high and dry.”
On Tuesday, Donald Tusk sent a strongly worded letter to a group of Tory MPs which appeared to blame the uncertainty of Brexit on the British electorate – adding to mounting tensions between Parliament and Eurocrats as Theresa May’s March Brexit deadline looms large.
One line of the letter read: “The only way to dispel the fears and doubts of all citizens concerned is the quickest possible start of the negotiations based on Article 50 of the treaty.”
Shadow Brexit Secretary Starmer dubbed the letter as “unhelpful” and claimed the Government could pass a law to guarantee the right of European foreigners who live in Britain.
He said: “At the very least there ought to be clarity for those who were already here on 23 June.”
Quarterly net migration figures due to be imminently released are expected to show that the annual figure remains more than three times May’s own target of 100,000.
To appease disgruntled voters, the Government is expected to announce a “deport first, appeal later” scheme for some challenging immigration decisions to help show the electorate they are committed to reducing migration.
A Home Office spokesperson said: “Government has been clear that, as we conduct our negotiations, it must be a priority to regain more control of the numbers of people who come here from Europe. It would not be right for us to give a running commentary on negotiations.”