This work contains a single alphabetical listing of over 5,000 division, brigade, and regimental field and staff officers in New Hampshire's militia between 1820 and 1850. The information was transcribed from the Adjutant General's officer roster, volumes one and two. Since it was the responsibility of the Secretary of State to maintain the roster prior to 1820, it was imperfectly kept and it is likely that it no longer survives. After 1820, the duty was transferred to the state's Adjutant Generals, where it was accurately maintained as long as the state's militia law remained in effect. Entries in the list include the name, rank, dates of commission and discharge (when given), and the unit of each officer. A large number of the entries also include the place of residence of the officer. In addition to the database, two documents that will aid the researcher in narrowing down the identity of the subject in question are included. The first is a breakdown by the villages, towns, or cities that made up each regiment, brigade and division. Since state law required each officer to reside within the boundaries of his militia unit, it is possible to distinguish militia officers with the same name by knowing their residence. The second document is a brief description of the duties of the militia officer.