According to a new state study, one in five New Hampshire residents commutes out of state every day for work.

Most – 78.9 percent – commute to Massachusetts while 9.3 percent travel to Vermont and 6.2 percent go to Maine, according to the New Hampshire Economic Conditions survey. Those 118,605 commuters were counterbalanced by 77,977 people who went the other way. 49.8 percent come from Massachusetts, 20.1 percent commute from Vermont and 23.3 percent travel from Maine.

Only two counties see more people commute into them than commute out each day. Grafton County, home to Dartmouth College and Dartmouth-Hitchcock Medical Center, attracts 23,974 commuters every day and sends 13,602 out of state, while 23,792 Grafton County residents work in the county. A little over half of those commuting into Grafton come from elsewhere in New Hampshire. Merrimack County sees 40,756 workers commute into the county, mostly from elsewhere in New Hampshire, while 34,296 commute out-of-county, also mostly to other New Hampshire counties and 34,965 Merrimack County residents also work in the county.

The state’s most populous counties, Hillsborough and Rockingham, both see substantial flows in and out each day. In the former, nearly 90,000 residents commute out-of-county for work – 42,669 who go to another state – while 75,449 commute in, 54,377 who come from elsewhere in New Hampshire, nearly half from Rockingham County. In the latter, over half of working residents – 89,281 – commute out of Rockingham, 42,642 of whom commute to Massachusetts and only 1,843 commute to neighboring Maine. Over half of the 71,532 workers who come into the area from Hillsborough and Strafford counties, while 15,166 come from Massachusetts and another 7,041 from Maine.