Local Police statistics from the Bureau of Justice Statistics. Personnel reports provide data on the diversity of the police force.
Statista - Quantitative data on over 80,000 topics from 18,000 sources. Has data on police force demographics, and more.
"Law Enforcement" section of the Characteristics of the Criminal Justice Systems in the Sourcebook of Criminal Justice Statistics
2021 Annual Survey of Public Employment and Payroll contains state and local governments (i.e., counties, municipalities, townships, special districts, and school districts) employment information by government function.
In the search box provided on each website, search for the specific type of surveillance equipment (ex., body cameras, in-car cameras, etc.) for which you would like statistics.