More than 80 couples have booked a gay marriage service at the Birmingham Register Office for December when the ceremony becomes legal.
The city has one of the highest demands in the country for civil partnership services and is one of only six places to have a waiting list.
Birmingham's Register Office in Broad Street has nearly six times as many couples as on Manchester's list - 16 - and nearly four times the 22 on the London Borough of Camden's list. Both areas are known for their large gay communities.
Brighton - Britain's gay capital - has by far the longest list in the country with 457 gay couples waiting for a civil partnership ceremony.
Liverpool City Council and Bath and North East Somerset Council also have waiting lists.
The Civil Partnership Act 2004 comes into force on December 5. Couples will have to wait a minimum of 16 days after that to have a service.
A spokesman from Birmingham Register Office said: "We are delighted that 80 couples are on our waiting list. We like to be ahead of the game in Birmingham. However, we expected there to be a surge of interest like this and anticipate that after a while it will start to calm down.
"We have already been offering commitment ceremonies, so this is a natural extension to that.
"It is all about equality." The ceremony, in which the couple sign a " schedule" detailing their commitment to each other, will cost £97.50 in Birmingham - the same as for a marriage service at the Register Office.
The schedule will be signed by both partners in front of two witnesses and a registrar. It is expected to be similar to the vows exchanged in a marriage ceremony.
Local authorities will decide whether the schedule can be added to or altered.
Meredith Thompson, a family lawyer at the Birmingham office of law firm Mills & Reeve, said she was not surprised there was such a high demand from gay couples in the West Midlands given that it is home to the country's biggest gay festival.
She said: "The Civil Partnership Act will allow gay couples to put both their relationship and their financial affairs on the same footing as married couples. Civil partners will now have many more significant rights and tax exemptions than a cohabitee.
"And as with marriage, the partnership will only end on death, dissolution or annulment."
Same sex couples who have a civil partnership ceremony will be exempt from Inheritance Tax, a partner's pension and capital gains tax breaks.
A bereaved partner will also be able to apply under the Inheritance Provision for Family and Dependents Act 1975 if he or she does not feel adequately provided for by a partner's Will.
Singer Elton John and his partner David Furnish have asked to be one of the first couples in Britain to have a civil partnership ceremony.
* To book a civil partnership ceremony at Birmingham register office call 0121 464 6631 or email email@example.com