Grounds for Divorce: The court may grant a no-fault divorce upon a showing of irreconcilable differences, which have caused the irremediable breakdown of the marriage. The court may grant a fault divorce in favor of the innocent party for any of the following causes:
1. Impotency of either party.
2. Adultery of either party.    
3. Extreme cruelty of either party to the other.    
4. Conviction of either party, in any state or federal district, of a crime punishable with imprisonment for more than one year and actual imprisonment under such conviction.    
5. When either party has so treated the other as seriously to injure health or endanger reason.    
6. When either party has been absent 2 years together, and has not been heard of.    
7. When either party is an habitual drunkard, and has been such for 2 years together.    
8. When either party has joined any religious sect or society which professes to   believe the relation of husband and wife unlawful, and has refused to cohabit with the other for 6 months together.    
9. When either party, without sufficient cause, and without the consent of the other, has abandoned and refused, for 2 years together, to cohabit with the other. [New Hampshire Revised Statutes]

Residency Requirements: In order to file for divorce in New Hampshire, both parties must reside in the state when the action is commenced, or the plaintiff must reside in the state and the defendant was personally served within the state, or the plaintiff resided in the state for one year next preceding the time when the action was commenced, and the grounds for divorce wholly arose or accrued while the plaintiff resided in the state. [New Hampshire Revised Statutes]

New Hampshire Child Support Enforcement Service Links and Telephone Numbers
New Hampshire Department of Health and Human Services Division of Child Support Enforcement
Telephone: 603–271–4745
Toll Free: 800 852 3345 ext. 4745

New Hampshire Child Support Guidelines and Calculator
N.H. Rev. Stat. Chapter 458-C

New Hampshire Child Support Calculator

New Hampshire Divorce Forms Online
Judicial Branch of New Hampshire Court Forms

New Hampshire Divorce Laws
New Hampshire Revised Statutes Annotated, Title 43, Chapter 458

New Hampshire Domestic Violence Resource Links and Telephone Numbers
New Hampshire Coalition Against Domestic and Sexual Violence
Telephone: 603–224–8893
Toll Free: 800–852–3388 (in New Hampshire)
Helpline: 603–225–9000 (outside of New Hampshire)
For a domestic violence center near you: 866–644–3574
For Sexual Assault: 800–277–5570

New Hampshire Free or Low Cost Legal Services Programs
Legal Advice & Referral Center, Inc.
Telephone: 800-639-5290

New Hampshire Mediation Centers and Service Links and Telephone Numbers
New Hampshire Judicial Branch Alternative Dispute Resolution
Telephone: 603–271–6418

New Hampshire State and Local Bar Association Lawyer Referral Service Links
New Hampshire Bar Association

New Hampshire State and Local Bar Association Lawyer Referral Service Telephone Numbers
Statewide: 603-229-0002