Grafton County is located in the state of New Hampshire and is the northernmost county in the state. It was established in 1769. The county seat is the city of North Haverhill.

Grafton County is governed by a five-member Board of County Commissioners. The board is responsible for setting the county budget, levying taxes, and overseeing county departments. The county also has a County Delegation, which is made up of representatives from each of the county's towns and cities. The delegation is responsible for making recommendations to the county commissioners on matters of county-wide importance.

Grafton County is home to several state parks, including Franconia Notch State Park, which is home to the famous Old Man of the Mountain rock formation. The county is also home to the White Mountain National Forest, which is the largest national forest in the state. The Appalachian Trail also passes through the county.

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