Maine’s two oldest towns, Kittery and York, have resolved a centuries-old dispute over their borders.

The issue dates back to the 1600s but reemerged a few years ago after a land developer purchased a parcel of land along Route 1 that straddles the boundary between the two towns.

York officials contended the border was a straight line, while Kittery argued that the divide meandered eastward from neighboring Eliot to Brave Boat Harbor on the coast.

The dispute between the two towns remained friendly — with residents of both towns making tongue-in-cheek references to a “border war” — until 2022, when York filed a lawsuit against Kittery in an effort to redraw the border. But the lawsuit was soon dismissed by a York County judge.

Now, over three and a half years later, the two towns have reached an agreement on a new boundary that the Maine Legislature is expected to officially approve in 2026.

The revised boundary was drawn up after a 2024 survey, the cost of which was split by both towns.

The proposed agreement follows roughly the same border both towns had been using, save for an added 4 acres of land designated for tree growth that will officially shift from York to Kittery.

York Town Manager Peter Thompson said officials are thrilled to have finally reached an agreement.

“ People that have been at this a lot longer than I have are very happy that this is kind of the last piece,” he said.

Kittery Town Council Chair Judy Spiller likewise said she is pleased to put the dispute to bed.

“It was our belief that we could sit down and sort this out,” she said. “Finally, the Select Board agreed with us that we should get the land surveyed, and then based on the results of the survey, we would ask the state Legislature to approve the new boundary line.”

The dispute initially arose in 2020 after a survey paid for by the developer indicated the true border was actually 333 feet south of the border both towns had been observing for much of their history.

York officials said a straight-line border had been established in 1652. Kittery disagreed and argued that the process to change the border would be an expensive and complicated one that could affect several families and businesses.

In 2020, Spiller defended the boundary line the towns had been following in a letter to the York Selectboard.

“In any event, the Town of Kittery will vigorously protect and defend her borders against any and all claims now, or in the future,” she wrote.

While any boundary change would not have altered property ownership, some officials feared it could prompt major changes to affected residents’ taxes and where they would send their children to school.

But the final agreement will have limited impact, officials from both towns said.

The 4 acres that are changing hands are wooded wetlands that won’t be developed.

And Thompson said the taxes for the affected property owners will only increase by a dollar or two.

Considering Kittery and York’s friendly histories with each other, Thompson said he’s glad the neighbors have finally put an end to the dispute.

“ The people of Kittery were great to work with,” he said. “Once we got over the initial rough patch there, it’s been fantastic.”