Contact the Grand Lodge of New Hampshire. http://www.nhgrandlodge.org
There is one lodge listed in Concord:
Concord
Blazing Star Eureka No: 11
53 Iron Works Road
Concord
Worshipful Master : Mark S. Hayes 228-1851
Secretary: Erville H. Smith 224-7882
Meets: 1st Wednesday except July/August
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Contact the Worshipful Master and/or Secretary at the number(s) listed above. Tell them of your interest in Masonry, and that you would like to have a petition. When you get the petition, follow the directions of the lodge Secretary, and fill out the petition, and submit it. Then you are on your way to becoming a Freemason.
You may also download and print a petition at http://nhgrandlodge.org/___Becoming_a_Mason/becoming_a_mason.html
You may also contact the Grand Lodge of New Hampshire at:
Grand Lodge of New Hampshire
John C Marden, Grand Secretary
813 Beech Street
Manchester, New Hampshire 03104-3136
Telephone: (603) 668-8744
I am delighted to hear of your interest in Freemasonry. May the Great Architect of the Universe guide your steps.