In the United States, there is no consistent use of the office of constable throughout the states; use may vary within a state. A constable may be an official responsible for service of process: such as summonses and subpoenas for people to appear in court in criminal and/or civil matters. They can also be fully empowered law enforcement officers. Constables may have additional specialized duties unique to the office. In some states the constable is an elected or appointed position at the state or local level of local government. Their jurisdiction can vary from statewide to county/parish and local township boundaries based on the state's laws.
The office developed from its British counterpart during the colonial period. Prior to the modernization of law enforcement in the middle 19th century, local law enforcement was performed by constables and watchmen. Constables were appointed or elected at the local level for specific terms and, like their UK counterparts the Parish Constable, were not paid and did not wear a uniform. They were often paid a fee by the courts for each writ served and warrant executed. Following the example of the British Metropolitan Police established in 1829, the states gradually enacted laws to permit municipalities to establish police departments. This differed from the UK in that the old system was not uniformly abolished in every state. Often the enacting legislation of the state conferred a police officer with the powers of a constable, the most important of these powers being the common law power of arrest. Police and constables exist concurrently in many jurisdictions. Perhaps because of this, the title "constable" is not used for police of any rank. The lowest rank in a police organization would be officer, deputy, patrolman, trooper, and historically, private, depending on the particular organization.
In many states, constables do not conduct patrols or preventive policing activities. In such states the office is relatively obscure to its citizens.
A constable may in some jurisdictions be assisted by deputy constables as sworn officers or constable's officers as civil staff, usually as process servers. In some states, villages or towns, an office with similar duties is marshal.
Alabama
In Alabama, a constable is traditionally elected from each election precinct. Counties may abolish the office of constable by county ordinance. Many have done so: as of 2015, only 24 of Alabama's 67 counties still had constables.
Alabama constables are peace officers and have full powers of arrest, stop and search within their county, except in certain counties which have had their constables' powers limited by act of the State Legislature (Etowah and Jefferson Counties). They are generally responsible for serving warrants and acting as process servers, as well as patrolling the streets and providing security for civic events. They are not funded from general tax revenues; instead, constables' fees are paid by the criminals they arrest.