There is a good deal of confusion among the general public about the status of heraldry in the United States, due to the perceived link between heraldry and nobility on the one hand, to the prohibition on titles of nobility on the other hand.
Here's what the US constitution says ( Article I, sections 9 and 10):
No title of nobility shall be granted by the United States: and no person holding any office of profit or trust under them, shall, without the consent of the Congress, accept of any present, emolument, office, or title, of any kind whatever, from any king, prince, or foreign state.
No state shall...grant any title of nobility.
The Constitution thus prohibits titles of nobility, but coat of arms are not titles of nobility, nor are they necessarily the prerogative of the nobility anyway. The US government is not in the habit of granting or regulating coat of arms, although nothing prevents it from doing so. But there aren't that many governments that are in such a habit to start with. In fact, heraldry is somewhat alive in the US. States have seals, Universities have coats, individuals used to and some still do. Here is what a founding father had to say on the topic:
It is far from my design to intimate an opinion, that Heraldry, Coat-Armor, etc. might not be rendered conducive to public and private use with us; or that they can have any tendency unfriendly to the purest spirit of Republicanism. On the contrary, a different conclusion is deducible from the practice of Congress, and the states; all of which have established some kind of Armorial Devices, to authenticate their official instruments.
George Washington
George (of a patrician bent, it is true) used his arms (
There are other indications that the Founding Fathers saw nothing wrong in heraldry: almost half of the signers of the Declaration of Independence used coats of arms. A number of U.S. Presidents have had and used coats of arms, including Roosevelt, Eisenhower and Kennedy.
There is legal protection for some armorial devices in the US, mainly official heraldry.