7 US cities where the number of million-dollar homes has doubled in the past 4 years

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In some US cities, million-dollar homes are becoming the norm.

Take San Francisco, where 57% of homes have a value of $1 million or more - or San Jose, where 46% are seven-figure homes.

That's according to real estate site Trulia, which looked at the share of million-dollar homes in the 100 largest US metro areas in a recent report.

Trulia then zeroed in on the top 10 metros that have seen the most drastic increase in share since 2012. Of those 10 metro areas, seven have doubled (or nearly tripled) the number of million-dollar homes in just four years, while the other three expensive areas (Honolulu, San Diego, and New York) have almost, but not quite, doubled the amount.

Read on to see where seven-figure homes have spread the most: