West Midlands Police Authority yesterday unanimously endorsed the Government's plan to merge the region's forces.
West Midlands Chief Con-stable Paul Scott-Lee said his force's police authority had given the scheme its unanimous backing.
"I am delighted the police authority has given its full backing with a show of unanimous support," said Mr Scott-Lee.
The police service was instructed by Home Secretary Charles Clarke to consider change after a report concluded in September that the 43-force structure was no longer "fit for purpose".
According to a report by Her Majesty's Inspectorate of Constabulary, forces with more than 4,000 officers tend to be far more successful. West Midlands Police meets the Home Office's requirements, as it employs 8,154 officers.
Warwickshire Police employs just 1,012, Stafford-shire Police 2,309, and West Mercia - which covers Here-fordshire, Worcestershire and Shropshire - has 2,380 officers.
Warwickshire has backed the proposals but raised doubts about the public accountability of the new force, which will have a management board of 23 members, probably based Birmingham.
It is also seeking guarantees that efficiency savings of £158 million over ten years, which will flow from economies of scale offered by the new arrangements, will be ploughed into improving front-line policing.
West Mercia Police Force is fully opposed to the plans and wants to reform itself into its own "strategic police service."
The police authorities' decisions followed a three-month consultation period which began when proposals to reduce the existing 43 forces nationwide to just 20 were announced.
West Mercia Chief Constable Paul West labelled the timescale "scandalous".
The Government plans will be delayed for more than a year if "forced amalgamation" is launched where police authorities oppose the plan.
The Home Secretary would then have to introduce primary legislation in Parliament, which could put the starting date back until 2008.