The U.S. has a minimum wage of $7.25 an hour for most types of work. Another, lesser known minimum-wage threshold is $23,660 a year. That’s the minimum an employer can pay workers and avoid requirements to pay them overtime.

Perhaps not coincidentally, 7.08 million Americans earned between $23,000 to $25,000 in 2013. That’s the red bar in the chart above using data from the Tax Policy Center, a nonpartisan research organization. That’s more than any other $2,000 bucket.

In March President Barack Obama issued an executive order calling for Labor Secretary Thomas Perez to update the regulations that define eligibility for overtime pay. That could affect wages for a large number of the 7 million Americans whose earnings are right around that wage threshold, and means the regulatory effort may bear watching because of the huge number of workers who could be affected.