The coats of arms of the U.S. states are coats of arms, that are an official symbol of the state, alongside their seal. Eighteen states have officially adopted coats of arms. The former independent Republic of Texas and Kingdom of Hawaii each had a separate national coat of arms, which are no longer used.

Heraldic arms were worn (embroidered) on a coat which knights wore over their armor, hence coat of arms, a term which dates back roughly 1,000 years to jousting tournaments. A state coat of arms may exist independently of the seal, but the reverse is not generally the case. A seal contains a coat of arms or other devices whereas a state coat of arms constitutes the bulk of a seal, except for the wording identifying it as the "Great Seal of the State of..." A "seal" has been described as the design impressed on public or legislative official documents, whereas a coat of arms generally appears for illustrative purposes. Examples include flags and banners, and state militia uniform caps and buttons, as well as specifically-designed regimental coats of arms for U.S. Infantry Regiments, and National Guard units.

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Heraldic coats of arms State Arms Adoption Blazon Article Alabama Coat of arms of the state of Alabama, adopted March 14, 1939 1819-12-14Statehood – 14 December 1819Arms – 29 December 1868Zieber, 1895, p. 112. Quarterly, the first Azure three fleurs-de-lis Or; the second quarterly first and fourth Gules a triple-towered castle Or masoned Sable and ajoure the first [viz., Azure], second and third Argent a lion rampant the third [viz., Gules] crowned, langued and armed the second [viz., Or]; third the first [viz., Azure], the crosses-saltires of St. Andrew and St. Patrick quartered per saltire counter changed argent and the third [viz., Gules]; the latter fimbriated of the second, surmounted by the cross of St. George of the third, fimbriated as the saltire; fourth the third [viz., Gules] a saltire the first [viz., Azure] fimbrated the fifth [viz., Argent], in saltire ten stars the fifth; overall an escutcheon of the third [viz., Gules] six pellets the fifth [viz., Argent] under a chief of the first [viz., Azure]. Coat of arms of Alabama (Wikimedia Commons category) Connecticut1788-01-09Statehood – 9 January 1788Arms – October 1842Zieber, 1895, p. 118. Arms of the state of Connecticut, adopted March 24, 1931On a shield of rococo design: Argent three grape vines Proper supported and fructed. Coat of arms of Connecticut (Wikimedia Commons category) Delaware 1787-12-07Statehood – 7 December 1787Arms – 18 January 1847 Coat of arms of the state of Delaware, adopted in 1777 Coat of arms of Delaware (Wikimedia Commons category) Hawaii Coat of arms of the state of Hawaii Coat of arms of Hawaii (Wikimedia Commons category) Louisiana1812-04-30Statehood – 30 April 1812Arms – 23 December 1813 Coat of arms of Louisiana (Wikimedia Commons category) Maryland1788-04-28Statehood – 28 April 1788Arms – 18 March 1876 Quarterly first and fourth, a paly of six Or and Sable, a bend counterchanged; quarterly second and third, quarterly Argent and Gules a cross bottony counterchanged. Above the shield an earl's coronet surmounted by a barred helm affronté Argent. Coat of arms of Maryland (Wikimedia Commons category) Massachusetts1788-02-06Statehood – 6 February 1788Arms – 13 December 1780Willson, 1864, p. 99. Coat of arms of the commonwealth of Massachusetts, adopted in 1775 (by Legislature, re-affirmed by Governor Hancock and Cabinet on December 13, 1780) Azure an Indian thereon dressed in a shirt and moccasins in his right hand a bow and in his left an arrow point downward Or, in chief dexter shield having a blue field or surface with an Indian thereon, dressed in a shirt and moccasins, holding in his right hand a bow, and in his left hand an arrow, point downward, all of gold; and, in the upper corner of the field, above his right arm, a silver star with five points. The crest is a wreath of blue and gold, on which in gold is a right arm, bent at the elbow, clothed and ruffled, with the hand grasping a broadsword. Coat of arms of Massachusetts (Wikimedia Commons category) Mississippi1817-12-10Statehood – 10 December 1817Arms – 6 February 1894 Arms of the state of Mississippi, adopted February 7, 2001 Coat of arms of Mississippi (Wikimedia Commons category) Missouri1821-08-10Statehood – 10 August 1821Arms – 11 January 1822 Coat of arms of the state of Missouri Coat of arms of Missouri (Wikimedia Commons category) New Jersey1787-12-18Statehood – 18 December 1787Arms – 10 September 1776 Coat of arms of the state of New JerseyAzure, three ploughs Proper; supporters, Liberty and Ceres. The Goddess Liberty to carry in her dexter hand a pole, proper, surmounted by a cap gules, with band azure at the bottom, displaying on the band six stars, argent; tresses falling on shoulders, proper; head bearing over all a chaplet of laurel leaves, vert; overdress, tenne; underskirt, argent; feet sandaled, standing on scroll. Ceres: Same as Liberty, save overdress, gules; holding in left hand a cornucopia, or, bearing apples, plums and grapes surrounded by leaves, all proper; head bearing over all a chaplet of wheat spears, vert. Shield surmounted by sovereign's helmet, six bars, or; wreath and mantling, argent and azure. Crest: A horse's head, proper. Underneath the shield and supporting the goddesses, a scroll azure, bordered with tenne, in three waves or folds; on the upper folds the words "Liberty and Prosperity"; on the under fold in Arabic numerals, the figures "1776" Coat of arms of New Jersey (Wikimedia Commons category) North Dakota Coat of arms of the state of North Dakota, adopted in 1957Device: On an Indian arrowhead point to base Or a bend vert charged with three mullets of the first, in base a fleur-de-lis of the second. Crest: On a wreath Or and azure, a sheaf of three arrows argent armed and flighted gules behind a stringed bow fessways Or with grip of the second (gules). Motto: Strength from the soil. Coat of arms of North Dakota (Wikimedia Commons category) Pennsylvania1787-12-12Statehood – 12 December 1787Arms – 17 March 1875 Coat of arms of the commonwealth of Pennsylvania, adopted 1778 Tierced per fess azure, Or, and vert; in chief a ship at sea proper; in fess a plough proper; in base three sheaves of wheat proper Coat of arms of Pennsylvania (Wikimedia Commons category) Rhode Island1790-05-29Statehood – 29 May 1790Arms – 24 February 1875Shankle, 1941, p. 210. Arms of the state of Rhode Island, adopted 1 February 1882 Coat of arms of Rhode Island (Wikimedia Commons category) Texas1845-12-29Statehood – 29 December 1845Arms – 25 January 1839Shankle, 1941, p. 213. Arms of the state of Texas Coat of arms of Texas (Wikimedia Commons category)Virginia1845-12-29Statehood – 25 June 1788Arms – 20 October 1619 (re-adopted 3 June 1976) Coat of arms of Virginia (Wikimedia Commons category)

Non-heraldic shields and seals