N.H. Rev. Stat. § 654:31-a
The information contained on the checklist of a town or city, specifically, the name, domicile address, mailing address, town or city, and party affiliation, if any, of registered voters, except as otherwise provided by statute, is public information subject to RSA 91-A. All other information on the voter registration form, absentee registration affidavit, qualified voter affidavits, domicile affidavits, affidavit of religious exemption, application for absentee ballot, and contact information, including but not limited to a phone number and email address, provided to the secretary of state or other election officials for the purpose of receiving information about elections shall be treated as confidential information and the records containing this information shall be exempt from the public disclosure provisions of RSA 91-A, except as provided by statutes other than RSA 91-A. Notwithstanding the foregoing, qualified voter affidavits are public records subject to RSA 91-A for the sole purpose of challenging an individual registering to vote or voting, challenging ballots to be recounted, to the extent that such ballot challenges are specifically authorized by law, or determining the accuracy of any qualified voter affidavit. Election officials and law enforcement personnel in furtherance of their official duties may access and may disclose information from the voter registration form, qualified voter affidavits, affidavits of religious exemption, absentee registration affidavits, and applications for absentee ballots, if necessary to resolve a challenge to an individual registering to vote or voting, or if necessary to investigate or prosecute election law violations or any crime. Law enforcement access and use of such records for the investigation or prosecution of crimes unrelated to election law violations shall be limited to the records of the specific individuals who are the subject of the investigation or prosecution.
RSA 654:31-a
2003, 289 : 53 . 2006, 94 : 1 ; 305:3. 2009, 278 : 2 . 2010, 366 : 3 . 2012, 284 : 12 , eff. Sept. 1, 2015. 2017, 205 : 10 , eff. Sept. 8, 2017. 2019, 331 : 3 , eff. Oct. 15, 2019.