The countries most engaged in sports betting are the United Kingdom, Ireland, Australia, Canada, and the United States. In the UK and Ireland, sports betting is legal, regulated and widely popular. In Australia, sports betting is legal and regulated, and it is the most popular form of gambling. In Canada, sports betting is legal and regulated, though it is not as popular as in the UK and Ireland. In the US, sports betting is legal in some states, but not in others.