The Bureau of Field Operation is the largest component of the Florissant Police Department. It includes the uniformed men and women assigned to patrol the city, providing the first line of police services. The BFO is under the command of Captain Tim Lowery and is divided into six squads each under the direct command of a Lieutenant and/or Sergeant.

Four patrol squads, each have a Lieutenant, Sergeants and Police Officers. The police officers are permanently assigned to seven patrol sectors that strategically dissect the city so as to provide the most efficient police patrols with the shortest possible response times. The sectors are defined based upon calls for service, the residential and business composition of the areas, and geographic factors that would impede rapid response.

The department has a philosophy of community oriented problem solving, intended to maintain or improve the quality of life in Florissant. Assigning the officers to their sectors on a long-term basis allows the offices to develop a rapport with the community and a greater working knowledge of their sectors. Each officer is expected to identify problems or needs within their sectors and they are encouraged to develop solutions and enlist the assistance of other officers, departments, or agencies that will assist them in solving problems.

The Patrol Support Unit has two squads of officers assigned to Traffic Safety, Canine, and Crime Interdiction Units. Traffic Safety Officers are certified Traffic Accident Reconstructionists who investigate crashes involving fatalities, serious physical injuries, and other crashes as deemed necessary. They also conduct and coordinate selective enforcement programs and consult with highway engineers and contractors regarding traffic hazards and construction projects.

The Canine Unit includes two officers and their canine partners. Both teams are graduates of the St. Louis Metropolitan Police Department's Canine Academy. They are highly trained in crowd control, tracking, and narcotics detection. The officers are assigned regular patrol hours and are on-call 24 hours a day to assist the department and other agencies as requested.

The Crime Interdiction Unit includes two officers who handle special "street level investigations ranging from code violations to narcotics violations. They have been extremely valuable in working with the patrol officers to rid neighborhoods of nuisance locations.

An officer of the Special Operation platoon is also partnered with a civilian Code Enforcement Officer to enforce ordinance violations ranging from derelict automobiles and property code violations, to illegal dumping of toxins and pollutants.

The Police Reserve Officer Program and the Police Explorer Post are also coordinated through the Special Operations commander.