​​Constables are among the earliest recorded police officers in world history. From a very humble beginning in the 5th century, by the turn of the 6th century they were chief household officers. In France, Constables commanded the armies in the Kings absence. Becoming noted peacekeepers under King William 'The Conqueror' in 1066 Constables responsibilities were expanded with the adoption of the Magna Carta, which not only became the pattern for most of the world’s Constitutions, but also mentioned Constables in written law. Constables have served the Justice Court system since 1362. In 1583 William Lambard published the first Policy & Procedure manual for Law Enforcement. It's primary purpose was to outline the duties of the Constable.

On March 5, 1823, John Tumlinson, the newly elected alcalde or Justice of the Peace of the Colorado District in Stephen F. Austin's first colony in Texas, wrote to the Baron de Bastrop in San Antonio that he had "appointed but one officer who acts in the capacity of constable to summon witnesses and bring offenders to justice." That appointee, Thomas V. Alley, thus became the first Anglo law enforcement officer in the future republic and state of Texas. Other prominent colonists who served as constable included John Austin and James Strange.

The Constitution of the Republic of Texas (1836) provided for the election in each county of a sheriff and "a sufficient number of constables." During the ten years of the republic's existence, thirty-eight constables were elected in twelve counties, the first in Nacogdoches County and the largest number (thirteen) in Harrisburg (later Harris) County. Court records indicate that violent crime was rare in the republic, except when horse or cattle thieves entered Texas from Arkansas or Louisiana; most indictments were for nonlethal crimes such as illegal gambling or assaults resulting from fights or scuffles. Juan N. Seguin and Elliott M. Millican both served as constables during the republic.

Shortly after Texas became a state, an act passed by the legislature specified that the constable should be "the conservator of the peace throughout the county," adding that "it shall be his duty to suppress all riots, routs, affrays, fighting, and unlawful assemblies, and he shall keep the peace, and shall cause all offenders to be arrested, and taken before some justice of the peace." Constables were the most active law-enforcement officials in many counties during the early statehood of Texas.

After Texas seceded from the United States in 1861, many county offices, including that of constable, remained unfilled or were filled by men less competent than their predecessors. During the military occupation of Texas after the Civil War, the election of county officials all but ceased, as the Union military appointed more than 200 individuals to state and county offices. A number of these appointees refused to serve; from 1865 to 1869, over one-third of the county offices in Texas were vacant. Many counties had no appointed or elected constables during this period. Austin, DeWitt, Fayette, McLennan, and Navarro counties had but a single constable each, appointed by Gen. Edward R. S. Canby, head of the Fifth Military District, in 1868-69.

Under the Constitution of 1869, a Reconstruction document that centralized many governmental functions, no constables were elected in Texas from 1869 to 1872, though some were appointed by justices of the peace. Many of these appointees lacked experience in handling violent offenders and access to secure jail facilities, and had few deputies to call upon for assistance. They were no match for the poor, embittered, and heavily armed former soldiers from both sides who roamed the state, often turning to crime. As a result, the office of constable began to diminish in importance, and the better-equipped county sheriffs began to assume a leading role in law enforcement. Still, a number of prominent Texas peace officers of the late nineteenth and twentieth centuries began their careers as constables or deputy constables, including Thomas R. Hickman, George A. Scarborough, and Jess Sweeten. In 1896, while serving as a United States deputy marshal, Scarborough shot and killed the controversial El Paso constable John Selman, who had himself gunned down the notorious John Wesley Hardin in 1895.

The Constitution of 1876, designed to decentralize control of the state government, reduced the power of many state officials and mandated that constables would once again be elected at the precinct level. A 1954 constitutional amendment extended their term of office from two years to four. Today, constables numbering approximately 780 are elected from precincts in most Texas counties. Their law-enforcement roles vary widely, but in general their police powers are no different from those of other peace officers in the state. Complete records do not exist, but the most recent estimate is that at least (93) ninety-three Texas constables have died in the line of duty, including (67) sixty-seven in the twentieth century.

Constables are commissioned by the Governor of Texas as Law Enforcement Agencies just as the Sheriff's Department or Texas Department of Public Safety. In fact, a Constable is an associate member of the D.P.S. under section 411.009(a) of the Government Code. His/Her "original" jurisdiction is anywhere in the county of election and is statewide in all criminal and most civil matters.

To meet the challenges and demands of this responsibility Texas Constables must be licensed by the Texas Commission on Law Enforcement with a minimum of 600 classroom hours of training in a Basic Police Academy as well as attend specialized civil process instruction during the training cycle to stay abreast of ever changing laws of the state.

In 2000, there were 2,630 full-time, sworn constables/deputy constables and 418 reserve deputies working in Texas.