The number of million-dollar earners in Massachusetts is rising.

There were 15,422 residents statewide who reported an adjusted gross income of more than $1 million in the 2014 tax year, the most recent year for which data are available, the state Department of Revenue says in its latest report on each city and town across the state.

That marked a 22 percent increase from the 12,598 residents who earned over $1 million in 2013, and a 47 percent increase from the number of million-dollar-earning residents in 2010.

Going back even further, in 2004, there were just 7,895 residents who reported an adjusted gross income of more than $1 million. That’s about half the number for 2014.

The total number for 2014 means that about 2 in every 1,000 Massachusetts residents was a million-dollar earner that year.

Some municipalities had much higher ratios of residents raking in seven figures in 2014, just as in previous years.

Weston had the highest proportion of million-dollar earners, about 47 per 1,000 residents, followed by Dover (40), Wellesley (30), Lincoln (21), and Sherborn (20).

In terms of raw numbers, Boston boasted the most million-dollar earners for the year, at 2,031, followed by Newton (1,284), Wellesley (853), Weston (555), and Cambridge (471).

But don’t get too comfortable, millionaires: Massachusetts lawmakers have proposed putting a so-called millionaires’ tax ballot initiative before voters in 2018.

The measure would impose a 4 percent levy on annual taxable income in excess of $1 million starting in 2019. Lawmakers overwhelmingly approved the ballot initiative in May, and it needs one more vote in the next legislative session before heading to the ballot.

Advocates of the measure say it would help fight economic inequality and that the money raised by the millionaires’ tax would go toward public education and transportation.

But opponents worry such a measure would scare away job-creating businesses. The Massachusetts High Technology Council is asking its members to raise money to lay the groundwork for a Beacon Hill campaign to kill ballot initiative before it reaches voters.

Matt Rocheleau can be reached at matthew.rocheleau@globe.com. Follow him on Twitter @mrochele