USA Currency Guide
The USA uses the US Dollar.
ATMs can be found all throughout the USA, particularly in the cities, major towns and downtown areas and at most petrol stations. If you plan on withdrawing money or using your credit card while travelling, don't forget to notify your bank before you go for security purposes and to see if any international withdrawal fees may apply to your card.
Before you leave home, it is important to convert some of your Australian Dollars into US Dollars to have with you when you arrive in the States. US Dollars are available to pre-purchase from Travel Money Oz before you fly.
For large purchases, it's a good idea to bring a credit card or travel money card with you on your holiday instead of carrying a lot of cash. If you don't have a credit card, consider a pre-paid Cash Passport, which lets you access your money in the form of US Dollars and other major currencies from ATMs and use wherever MasterCard is accepted.