If you want to live on Nantucket, bring at least $1 million. That's the entry fee.

Almost every active home listing on the 14,000-person island is priced at $1 million or more, per Realtor.com. The median price is $4.08 million. The island averages about 138 million-dollar listings a year.

It's About Scarcity

Nantucket and its neighbor Martha's Vineyard - where 90% of listings top $1 million - are island markets. Land is limited. Building codes are strict. And that combination sets a real price floor.

But scarcity isn't just coastal. Jackson, Wyoming, came in third with a median price of $1.75 million. Only 3% of the land is private - the rest is saved.

Realtor.com found 13 markets where at least half of all active listings top $1 million. Five are in California. Others include Kapaa, Hawaii; Hailey, Idaho; and Petoskey, Michigan, where the median is $1.1 million.

Even Luxury Is Softening

The top 10% of homes was at $1.25 million in March. That's down 2.9% from a year ago. The middle price is down 2.2% too.

Prices are rising for spring though. The top tier rose 3.7% from Feb. The rest gained 3%.

Worth Noting

The top 1% of homes in Rifle, Colorado - about 70 miles from Aspen - starts near $59.2 million. In Petoskey, Michigan, the same level starts just under $8 million.

Million-dollar homes aren't just in the places you'd expect anymore.