The most visible and largest part of the department, the men and women of the four Patrol watches are the first responders to citizens' calls for police assistance or intervention. These officers work 12-hour shifts in a minimum of 12 patrol districts that cover the 78 square miles of the city. These districts vary in geographical size, however, the dispatched calls for service to each district are analyzed on a quarterly basis by watch commanders to ensure that no district officer receives a disproportionate number of dispatched calls compared to other districts.