The 20 colleges that have created the most millionaires and billionaires

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About 1,900 Harvard alumni have a net worth over $30 million.

No college degree can guarantee you wealth, but a handful of schools have a proven track record of minting rich people, from billionaire founders and CEOs to investors to politicians.

Wealth-X, a firm that does research and valuations on ultra-high net worth (UHNW) individuals, has revealed where the world's wealthiest people - those with assets exceeding $30 million - went to college.

In its tally, Wealth-X counted alumni with both undergraduate and graduate degrees, counting alumni of multiple institutions more than once, but left out those with diplomas, certificates, honorary degrees, and drop outs. Considering some of the world's richest self-made billionaires dropped out of Harvard, Stanford, University of Chicago, and other schools on this list, the numbers of UHNW alumni could be even higher had they graduated.

Of the top 20 colleges in the world that produce the wealthiest people, five are public universities, six are Ivy League, and only one is located outside of the US. By and large, Harvard University mints the highest number of millionaires and billionaires, which together command a net worth of $811 billion, more than twice that of the No. 2 school, University of Pennsylvania.

Below, check out the top 20 colleges in the world that have produced the most rich people, along with the total known number of UHNW individuals with degrees from the institutions, and their combined wealth.