Interestingly, Investopedia puts Aussies above USAians (but this probably includes the house):
Less than $5,000: Majority of Sub-Saharan Africa, Bangladesh, Cambodia, Laos, Nepal, Sri Lanka, Vietnam, Belarus, Moldova and Ukraine.
From $5,000 to $25,000: Majority of the countries in Latin America, a large portion of countries bordering the Mediterranean, China, India, Indonesia, Pakistan, Philippines and Russia.
From $25,000 to $100,000: Chile, Brazil, Mexico, Uruguay, Czech Republic, Estonia, Hungary, Lithuania, Malta, Poland, Slovenia, Bahrain, Lebanon, Oman, Saudi Arabia, Turkey, South Africa and Namibia.
From $100,000 to $300,000: North America, Western Europe, rich Asia-Pacific and Middle East countries.
From $300,000 to $500,000: Australia and Norway
Over $500,000: Switzerland
Looking at the USA specifically, the wealth distribution shows the top 10% has an average wealth of over $1.6M (again, probably includes their house):
Avg Net Worth Bottom 25%: $4,600
Avg Net Worth Next 25 – 50%: $21,700
Avg Net Worth Next 50 – 75%: $78,900
Avg Net Worth Next 75 – 90%: $242,800
Avg Net Worth Top 10%: $1,606,600
Total Net Worth of the Top 400 (Forbes 2011): $1,707,250,000,000