Here’s another example of how expensive Southern California housing can be: The state is home to nearly one-quarter of the nation’s million-dollar housing communities.

That’s what I found while reviewing Realtor.com data that tracks home listing patterns in 15,000 largest ZIPs nationwide.

As of May 1, there were 401 U.S. ZIP codes with a median listing price of $1 million or more in this database gleaned from broker listing networks. Southern California had 94 of those seven-figure ZIPs. In fact, nine of the nation’s Top 25 priciest ZIPs were located between Santa Barbara and the Mexican border.

Southern California’s million-dollar ZIPs include 47 in Los Angeles County; 19 in Orange County; 15 in San Diego County; 12 in Santa Barbara and Ventura counties; and one in Riverside County.

Northern California’s Atherton 94027 was nation’s most expensive ZIP, with a May listing median of $8.07 million, down 15 percent in a year. Beverly Hills 90210 at $5.4 million, down 11 percent in a year, was second.

In fact, California overall had 159 of the nation’s 401 seven-figure ZIPs. That’s 40 percent!

These stats confirm an emerging trend that million-dollar communities are no longer simply exclusive enclaves for the uber-rich as continued house appreciation pushes certain modestly upscale homes in less luxurious settings into seven-figure status.

“Million has become a new benchmark. In many markets, you’re not getting a luxury product, just a very nice, mid-sized home,” says Realtor.com researcher Javier Vivas. “What we are tracking is where is the demand coming from. Are the buyers local? Where are the people coming from? Is this market sustainable?”

Not that the priciest of the local million-dollar towns aren’t swanky. Here are other noteworthy seven-figure ZIPs in Southern California, with U.S. rank; median listing price; and change since May 2016:

No. 6: Los Angeles 90077, notably Bel Air: $4.88 million, down 2 percent.

No. 8: Santa Barbara 93108: $4.47 million, flat.

No. 13: Malibu 90265: $4.01 million, down 6 percent.

No. 14: Santa Barbara 93110: $3.91 million, up 1 percent.

No. 17: Santa Monica 90402: $3.79 million, flat.

No. 19: Newport Coast 92657: $3.70 million, up 28 percent.

No. 20: Newport Beach 92661: $3.69 million, down 7 percent.

No. 21: Pacific Palisades 90272: $3.67 million, up 2 percent.

And if you’re a California coastal real estate snob and thinking “Million dollars in the Inland Empire?” … Temecula 92590 was the nation’s 252nd priciest ZIP at $1.3 million.

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Note: This story was updated with new counts for Orange and Los Angeles counties.