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'United States coinage' was first minted by the new republic in 1792. New coins have been produced every year since then and they make up a valuable aspect of the United States currency system. Today circulating coins exist in denominations: $0.01, $0.05, $0.10, $0.25, $0.50, and $1.00. Also minted are bullion and commemorative coins. All of these are produced by the United States Mint. The coins are then sold to Federal Reserve Banks which in turn are responsible for putting coins into circulation and withdrawing them as demanded by the country's economy.

Contents

Current coinage

Coins in circulation

Remarks

Bullion coins

Commemorative coins

Obsolete coins and denominations

Criticisms

External links

Current coinage

Today four mints operate in the United States producing billions of coins each year. The main mint is the Philadelphia Mint which produces circulating coinage, mint sets and some commemorative coins. The Denver Mint also produces circulating coinage, mint sets and commemoratives. The San Francisco Mint produces regular and silver proof coinage. The West Point Mint produces bullion coinage (including proofs). Philadelphia and Denver produce the dies used at all of the mints. The proof and mint sets are manufactured each year and contain examples of all of the year's circulating coins. These and the other non-circulating coins can be purchased directly from the US Mint.

Coins in circulation

Image		Value	Technical parameters (latest)				Description			Date of first minting	Mainstream	Common Reference
Obverse	Reverse		Diameter	Thickness	Mass	Composition	Edge	Obverse	Reverse
		1¢	19 mm		3.11 g	95% copper 5% tin and zinc1	Plain	Abraham Lincoln	Wheat	1909	Yes2	Wheat Penny, Penny, Cent
		1¢	19.05 mm	1.55 mm	2.5 g	97.5% zinc core 2.5% copper plating1			Lincoln Memorial	1959	Yes
		5¢	21.21 mm	1.95 mm	5 g	75% copper 25% nickel	Plain	Thomas Jefferson	Monticello	1938	Yes	Nickel
See article		5¢							Westward Journey Series	2004
		5¢							Monticello	2006
		10¢	17.91 mm	1.35 mm	2.268 g	91.67% copper 8.33% nickel3	118 reeds	Franklin D. Roosevelt	Torch, oak branch, olive branch	1946	Yes	Dime
		$¼	24.26 mm	1.75 mm	5.670 g		119 reeds	George Washington	Bald eagle	1932 (resumed in 1977)4	Yes	Quarter
		$¼							Bicentenial colonial military drummer	(1975) 19764
	See article	$¼							State Quarter Series	1999
		$½	30.61 mm	2.15 m	11.34 g		150 reeds	John F. Kennedy	Seal of the President of the United States surrounded by 50 stars	1964 (resumed in 1977)4	No5	Half dollar, 50-cent piece
		$½							Independence Hall	(1975) 19764
		$1	26.5 mm	2 mm	8.1 g		reeded	Susan B. Anthony	Apollo 11 mission insignia	1979 (resumed in 1999)7	No5	SBA, Suzie B.
		$1	26.5 mm	2 mm	8.1 g	88.5% copper 6% zinc 3.5% Manganese 2% nickel	Plain	Sacagawea	Bald Eagle in flight	2000	No5	Gold(en) dollar
see article6		$1					Plain w/ incused inscriptions	Every (deceased) president	Statue of Liberty	2007	TBD	Gold(en) dollar

Remarks

# The mass and composition of the penny changed to the current copper plated zinc core in 1982. Both types were minted in 1982 with no distinguishing mark. Pennies minted in 1943 were struck on zinc coated steel cores, but are not found in circulation today.
# Wheat ear pennies were mainstream during its time. They are now rare, but findable in circulation.
# Dimes and quarters from before 1965 and half-dollars from before 1971 generally don't remain in circulation due to being removed for their silver content. The half-dollar retained a lower silver content between 1965 and 1970.
# In 1975 and 1976 bicentennial coinage was minted. Regardless of date of coining, each coin bears the dual date "1776-1976".
# Use of the Kennedy half-dollar, Susan B. Anthony and Sacagawea dollars is not as widespread as that of other coins in general circulation. Coins are minted for general release through banks and other financial institutions, and are also available for collectors in uncirculated rolls, mint sets and proof sets from the United States Mint.
# The Presidential Dollar series will feature portraits of all deceased U.S. Presidents with four coin designs issued each year in the order of the president's inauguration date. These coins began circulating on February 15, 2007.
# The Susan B. Anthony dollar coin was minted from 1979-1981 and 1999. The 1999 minting was in response to Treasury supplies of the dollar becoming depleted and the inability to accelerate the minting of the Sacagawea dollars by a year. 1981 Anthony dollars can sometimes be found in circulation from proof sets that were broken-open, but these dollars were not minted with the intent that they circulate.

Bullion coins

Non-circulating bullion coins have been produced each year since 1986. They can be found in silver, gold and also platinum since 1997. The face value of these coins is symbolic and does not actually reflect the value of the precious metal contained therein.

Type	Diameter	Fineness	Face Value	Content
American Silver Eagle	40.6 mm	999 fine silver	$1	one troy ounce (~31.1 grams)
American Gold Eagle	16.5 mm 22.0 mm 27.0 mm 32.7 mm	916 fine gold (22 karat)	$5 $10 $25 $50	1/10 troy ounce (~3.11 grams) ¼ troy ounce (~7.78 grams) ½ troy ounce (~15.6 grams) one troy ounce (~31.1 grams)
American Platinum Eagle	16.5 mm 22.0 mm 27.0 mm 32.7 mm	999.5 fine platinum	$10 $25 $50 $100	1/10 troy ounce (~3.11 grams) ¼ troy ounce (~7.78 grams) ½ troy ounce (~15.56 grams) one troy ounce (~31.1 grams)
American Buffalo	32.7 mm	999.9 fine gold (24 karat)	$50	one troy ounce (~31.1 grams)

Commemorative coins

Modern commemoratives have been minted since 1982. A complete list is available: Modern United States commemorative coins.

Composition of US Modern Commemorative Coins

Type	Total Weight	Diameter	Content	Weight of Precious Metal
Half Dollar	11.34 grams	30.61 mm (1.205")	92% Cu, 8% Ni	(none)
Dollar	26.73 grams	38.1 mm (1.50")	90% Ag, 10% Cu	24.057 grams Silver (0.773 Troy oz)
Half Eagle	8.359 grams	21.59 mm (0.850")	90% Au, 6% Ag, 4% Cu	7.523 grams Gold (~ 0.26 oz)
Eagle	16.718 grams	26.92 mm (1.06")	90% Au, 6% Ag, 4% Cu	15.05 grams Gold (~ 0.53 oz)
First Spouse Eagle Bullion	14.175 grams	26.49 mm (1.043")	99.99% Au	14.175 grams (1/2 oz)

Obsolete coins and denominations

★ Half cent: $0.005, copper

★ Large Cent: $0.01, copper

★ Two-cent piece: $0.02, copper

★ Three-cent piece: $0.03, silver and copper/nickel

★ Half dime: $0.05, silver

★ Twenty-cent piece: $0.20, silver

★ Silver dollar: $1.00, silver (some modern commemoratives are minted in this denomination)

★ Gold dollar: $1.00, gold

★ Quarter-eagle: $2.50, gold

★ Three-dollar piece: $3.00, gold

★ Stella: $4.00, gold (not circulated)

★ Half-eagle: $5.00, gold (some modern commemoratives are minted in this denomination)

★ Eagle: $10.00, gold (some modern commemoratives are minted in this denomination)

★ Double eagle: $20.00, gold

★ Fifty-dollar coin or "Half-union" (Commemorative only, California territorial gold, pattern piece)
'Note:' It is a common misconception that "eagle"-based nomenclature for gold U.S. coinage was merely slang. This is not the case. The "eagle," "half-eagle" and "quarter-eagle" were specifically given these names in the Coinage Act of 1792. Likewise, the double eagle was specifically created as such by name ("An Act to authorize the Coinage of Gold Dollars and Double Eagles", title and section 1, March 3, 1849).
Some modern commemorative coins have been minted in the silver dollar, half-eagle and eagle denominations.
See also US coin sizes, showing all major US coin series and scaled images in a single chart.
The law governing obsolete, mutilated, and worn coins and currency, including denominations which are no longer in production (i.e. Indian cents) can be found in 31 USC 5120.

Criticisms

Unlike many world currencies the values of US coins are not inscribed in numerals on the coin. Instead the value is written in English words presenting potential difficulties for visitors to the country who do not speak the language well or English speakers unfamiliar with the currency. Furthermore, the coins' inscriptions do not follow a pattern in describing the value: "One Cent" (penny), "Five Cents" (nickel), "One Dime" (worth 10 cents), "Quarter Dollar" (worth 25 cents), and "Half Dollar" (worth 50 cents). The Presidential $1 Coins will be the first coins to display the coin's value using numerals ("$1" instead of "One Dollar").
For historical reasons the size of the coins does not increase with their face value. Both the one cent and the five cent are larger than the ten cent and the less common 50 cent coin is larger than the recent Sacagawea and Susan B. Anthony dollar coins. The sizes of the dime, quarter and half dollar are holdovers from before 1965 when they were made from 90% silver and 10% copper; their sizes thus depended upon the amount of silver needed to equal the face value. The diameter of the current dollar coins was introduced in 1979 with the Susan B. Anthony dollar not only as a concession to the vending machine industry which wanted a smaller dollar coin usable in their machines but also as an increase in the amount of seigniorage for the US Government (the difference between what a piece of money costs to produce and its face value or the "profit margin").

External links

★ United States Mint

★ United States Virtual Coin Museum

★ Page of 1792 Mint and Coinage Act (Describes the first completely regulated U.S. coinage system.)

★ What have they done to our coins? - An article visually exploring recent changes to U.S. modern coin designs.

★ Complete US Coin Histories By year and type.