From Washington to Washington

From Washington County, Maine, to Clallam County, Washington, including the starting and ending counties in the list of counties, how long by count of counties in the list of counties such that adjacent counties in the list have some common border length?


The answer is 77.

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1 solution

An example solution is below. There are other solutions; but, they are equal length or longer.

Washington County, Maine; Aroostook County, Maine; Somerset County, Maine; Franklin County, Maine; Oxford County, Maine; Carroll County, New Hampshire; Grafton County, New Hampshire; Windsor County, Vermont; Bennington County, Vermont; Rensselaer County, New York; Greene County, New York; Delaware County, New York; Broome County, New York; Tioga County, New York; Chemung County, New York; Steuben County, New York; Allegany County, New York; Cattaraugus County, New York; Warren County, Pennsylvania; Crawford County, Pennsylvania; Ashtabula County, Ohio; Geauga County, Ohio; Cuyahoga County, Ohio; Lorain County, Ohio; Huron County, Ohio; Seneca County, Ohio; Hancock County, Ohio; Henry County, Ohio; Defiance County, Ohio; DeKalb County, Indiana; LaGrange County, Indiana; Elkhart County, Indiana; St. Joseph County, Indiana; LaPorte County, Indiana; Jasper County, Indiana; Lake County, Indiana; Cook County, Illinois; McHenry County, Illinois; Walworth County, Wisconsin; Jefferson County, Wisconsin; Dane County, Wisconsin; Sauk County, Wisconsin; Vernon County, Wisconsin; Houston County, Minnesota; Fillmore County, Minnesota; Mower County, Minnesota; Freeborn County, Minnesota; Faribault County, Minnesota; Martin County, Minnesota; Jackson County, Minnesota; Osceola County, Iowa; Lyon County, Iowa; Minnehaha County, South Dakota; McCook County, South Dakota; Hutchinson County, South Dakota; Charles Mix County, South Dakota; Lyman County, South Dakota; Jones County, South Dakota; Haakon County, South Dakota; Pennington County, South Dakota; Weston County, Wyoming; Converse County, Wyoming; Carbon County, Wyoming; Fremont County, Wyoming; Teton County, Wyoming; Fremont County, Idaho; Clark County, Idaho; Lemhi County, Idaho; Idaho County, Idaho; Wallowa County, Oregon; Umatilla County, Oregon; Benton County, Washington; Yakima County, Washington; Lewis County, Washington; Grays Harbor County, Washington; Jefferson County, Washington; and Clallam County, Washington

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