In the US - I believe that the largest single department with the most manpower OPERATING UNDER A SINGLE EMPLOYER and WITH ONE COMMAND STRUCTURE is the City of New York. Other large cities (i.e.: Los Angeles) may have more actual law enforcement officers employed within their city but they are made up of INDIVIDUAL agencies (sheriff's office's & various municipalities) and not one large overall agency.
There are a total of 141 police departments in the state of Florida. The largest of those is the Miami-Dade Police Department.
The three largest police departments in Tennessee are the Metropolitan Nashville Police Department (MNPD), the Memphis Police Department, and the Knoxville Police Department. MNPD is the largest with approximately 1,500 sworn officers, followed by the Memphis Police Department with over 2,000 officers, and the Knoxville Police Department with around 400 officers.
Philadelphia, Pittsburgh, Temple University, Allentown, Erie
450 police departments
The world's largest police station is located in Chicago, Illinois, USA. It is the Chicago Police Department Headquarters, which covers an area of approximately 85,000 square meters (918,000 square feet) and houses various police units and administrative departments.
According to Wikipedia, there are 131 city police departments in Oregon.
The largest subunits of the federal executive branch are called departments. The head of the departments is called the secretary.
Police chief.
No. Many books and movies portray actual police departments.
contrasting the roles and functions of municipal and county police departments
Most police departments do post job opportunities online. Job listings for police departments can typically be found on the city's website and include requirements of the position and instructions for how to apply.
More information about a police academy may be obtained by contacting local police departments. Local police departments will have information about training requirements.