5 Largest Police Departments in the US

3. Los Angeles (CA) Police

Number of Full-Time Sworn Personnel: 9,870

Population Served: 3,976,322

Personnel per 10,000 Residents: 25

The LAPD serves 21 community areas, which house almost 4 million individuals, which is why it is one of the largest police forces in the US. The department established its Community Safety Partnership (CSP) program in 2011, which enables residents to engage in community policing initiatives.