We’re a nation of millionaires.

For the 10th straight year, the number of rich folks has gone up in the United States — with more people of means here than the total populations of Greece or Portugal.

A new study has found that in 2018, there were 11.8 million households in the United States with a net worth of more than $1 million, making up 3 percent of the US population.

According to the Market Insights Report by the Chicago-based research firm Spectrem, there were 250,000 newly minted millionaires just last year.

But while the number of seven-figure households is growing, the rate at which people are becoming millionaires is slowing, mostly due to a flat stock market.

To make the cut, you had to have a net worth of $1 million in 2018, not including the value of your primary residence — so that means a lot of dough in the bank.

Also, 1.3 million well-off Americans were in the ultra-high-net-worth category — defined as having household assets excluding primary-home real estate of between $5 million and $25 million. And some 173,000 households have a net worth above $25 million.