Ireland's main currency is the Euro. Because most places you visit will be able to take your credit or debit cards, you don't need to take much cash. In fact, there is really no reason to get Euros before you leave the US.
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You could take a large amount of euros with you by going to your local bank or AAA and purchasing them before you trip, but this is problematic for a couple of reasons. First, it is a security risk. Ireland is as safe a country as any, but its never a good idea to carry a large amount of cash with you while traveling.
Debit cards are, by far, the most popular payment method in Ireland. Credit cards are also popular, but unlike debit cards, they are used mostly for larger purchases. Ireland also sees a decent amount of cash payments – around 20% of all sales were paid for in cash.
You can't use dollars in Ireland so we advise paying for your vacation using a mix of cash withdrawals and card payments. The Republic of Ireland uses euros (€) and Northern Ireland uses pounds (£). For Ireland tours visiting Northern Ireland, you'll need a small amount of pounds alongside euros.
While you're in Ireland: ensure that your belongings, including your passport, are secure at all times. don't keep your passport and other types of ID in the same place and carry a photocopy rather than the original when you are out. avoid showing signs of affluence or wearing expensive jewellery.
Resist the urge to buy foreign currency before your trip.Some tourists feel like they just have to have euros or British pounds in their pockets when they step off the airplane, but they pay the price in bad stateside exchange rates. Wait until you arrive to withdraw money.
Ireland - Level 1: Exercise Normal PrecautionsIf you decide to travel to Ireland: Enroll in the Smart Traveler Enrollment Program (STEP) to receive Alerts and make it easier to locate you in an emergency. Follow the Department of State on Facebook and Twitter.