Dollar coin (United States)
|Mass||8.100 (2000-) g (0.260
|Diameter||26.5 mm (1.043 in)|
|Thickness||2.00 mm (0.079 in)|
|Edge||Plain with incised inscriptions|
|Years of minting||1794–present |
|Design date||2000 (modified 2009)|
|Design||Images with contributions made by Native American tribes and individual Native Americans to the history of the United States|
The dollar coin is a United States coin worth one
Dollar coins have never been very popular in the United States since the removal of
The gold dollar (1849–89) was a tiny coin measuring only 13 mm making it difficult to grasp and easy to lose, a serious problem when a dollar was almost a day's wage.
Dollar coins have found little popular acceptance in circulation in the United States since the early 20th century, despite several attempts since 1971 to increase their usage. This contrasts with currencies of most other
The United States Government Accountability Office (GAO) has stated that discontinuing the dollar bill in favor of the dollar coin would save the U.S. government approximately $5.5 billion over thirty years primarily through
Whatever the reason, a U.S. Mint official claimed in a November 2012 meeting that most of the 2.4 billion dollar coins minted in the previous five years were not in circulation. 
Although the distribution of the dollar coin is limited due to lack of popularity, the Metropolitan Transportation Authority (MTA) in New York city and several other transit systems use dollar coins as change from ticket purchases from machines at stations.