The smallest constituency in the region is Aldridge-Brownhills
, represented since 1979 by independent-minded Conservative Richard Shepherd, with just 59,506 voters, according to the Boundary Commission for England.
A letter urging Mr Cameron to delay the change until after the next election was signed by Guy Hordern, chairman of Edgbaston Conservative Constituency Association, and John Rochelle, chairman of the Aldridge-Brownhills
association, among others.
In theWest Midlands, the constituency of Lichfield has experienced an increase of 160 per cent, while the number of claimants in Aldridge-Brownhills
, one of the wealthiest parts of the Black Country, increased by 118 per cent, more than doubling.
Branches named as candidates for closure in the consultation included two in Aldridge-Brownhills
, three in Bromsgrove, five in Dudley, two in Redditch, three in Stourbridge, three in Walsall, three in Warley and five in West Bromwich.
The constituency of Aldridge-Brownhills
is abolished, and most of the constituency becomes Walsall North.
The potential danger to the child emerged in March after the man met Aldridge-Brownhills
MP Richard Shepherd to ask for his help in regaining access to the child.
But with polls putting Labour in third ahead of the election and strong support for the Conservatives in neighbouring Aldridge-Brownhills
, vote shares might look very different this time.
A UKIP spokesman said: "We have candidates standing in all constituencies in the region except Aldridge-Brownhills
, where there was already a eurosceptic candidate, and Nuneaton, where our candidate had to pull out.
The affected constituencies are Birmingham Erdington, Dudley South, Birmingham Northfield, Aldridge-Brownhills
, North Warwickshire, Burton in Staffordshire, Coventry North West, Newcastle-under-Lyme in Staffordshire, Solihull, Wolverhampton South West and Worcester.