| 620 Associates (MS044) |
| Allied Theater Company Account Books (MS077) |
| Badger, William (MS007) |
| Badger Farms Creameries (MS090) |
| Benson, John Prentiss (MS091) |
| Blue Strawbery Restaurant Scrapbook Collection (MS076) |
| Bowles Family Papers (MS108) |
| Brewster Papers (MS064) |
| Bridget Graffort Club (MS045) |
| Central Baptist Church (MS020) |
| Coues Family (MS011) |
| Coussoule, Loukas N. (MS063) |
| Customs House Records (MS016) |
| Daughters of the American Revolution, Ranger Chapt (MS038) |
| Decatur Family (MS055) |
| Decatur, Stephen (MS099) |
| Dover Medical Society (MS054) |
| Dudley Stoddard Collection (MS107) |
| Durant, Barbara Laighton Collection (MS104) |
| Family Service Association (MS013) |
| Flagg, William (MS048) |
| Frost, Joseph W P (MS095) |
| Frost Family (MS034) |
| Green's Drug Store (MS006) |
| Gardner, William Insurance Policy Books (MS097) |
| Gilson, Josiah P. Diaries (MS083) |
| Hale, Samuel (MS059) |
| Hale, Samuel (MS043) |
| Harmony Grove and Sagamore Cemetery Records (MS105) |
| Harris Family (MS078) |
| Haven Family Records (MS106) |
| Haven, George Wallis Diaries (MS073) |
| Haven, Nathaniel A. Papers (MS101) |
| Hill, Arthur Dehon (MS030) |
| Hill, Arthur Dehon (MS005) |
| Isles of Shoals (MS058) |
| Isles of Shoals US Coast Guard Station 14 (MS086) |
| Ladd Family (MS018) |
| Ladd, William (MS017) |
| Langdon, John, William Whipple and Elwyn Family (MS050) |
| Langdon, Samuel (MS049) |
| Larkin Collection (MS010) |
| Liberty Pole Association (MS085) |
| MacDonald-Leonard Collection (MS084) |
| MacPhaedris-Warner-Penhallow (MS003) |
| Marvin Peirce Collection (MS072) |
| Mechanic Fire Society (MS029) |
| Miller, Tobias Ham (MS012) |
| National Society of Colonial Dames - NH (MS087) |
| New Castle Bridge and Piscataqua Bridge Corporations (MS075) |
| New Castle Bridge Association (MS024) |
| New Hampshire Fire and Marine Insurance Co. (MS002) |
| North Church (MS036) |
| Parrott-Spalding Family (MS079) |
| Parsons Family Papers (MS082) |
| Peirce Family (MS009) |
| Pepperrell Family Papers (MS093) |
| Pepperrell, William (MS028) |
| Portsmouth Advocates (MS109) |
| Portsmouth Athenaeum (MS001) |
| Portsmouth Customs House Office Records (MS016) |
| Portsmouth Female Asylum (MS057) |
| Portsmouth Fire Relief (MS071) |
| Portsmouth Historical Society Collection (MS022) |
| Portsmouth Historical Society Records (MS023) |
| Portsmouth Hospital Collection (MS066) |
| Portsmouth Housing Authority (MS080) |
| Portsmouth Journal Papers (MS068) |
| Portsmouth Lyceum Records (MS089) |
| Portsmouth Marine Society (MS026) |
| Portsmouth Medical Society (MS046) |
| Portsmouth Police Department Records (MS033) |
| Portsmouth Property Records (MS081) |
| Portsmouth Regional Visiting Nurses Association (MS021) |
| Portsmouth School Department (MS032) |
| Portsmouth Yacht Club (MS047) |
| Randall, Wendell (MS041) |
| Rockingham Association of Congregational Christian Churches and Ministers (MS052) |
| Rockingham County Court of Common Pleas (MS042) |
| Rockingham House (MS053) |
| Rollins, Ichabod (MS059) |
| Rowe, Jefferson C. Records (MS103) |
| Safford, Moses (MS069) |
| Sandford, John (MS015) |
| Sea Crest Village Records (MS062) |
| Seacoast Science Center (MS098) |
| Shipyard Project (MS092) |
| Sise, John (MS037) |
| South Church (MS039) |
| South Church (MS004) |
| Star Island Corporation Collection (MS100) |
| St. John's Church (MS027) |
| Temple Israel (MS051) |
| Treadwell Family (MS008) |
| Tredick and Brewster Family Papers (MS019) |
| Turner, Peter Papers (MS096) |
| United Spanish War Veterans Winfield Scott Schley (MS040) |
| Warner House Association (MS031) |
| Wendell, Andrew Peterson (MS070) |
| Wendell Family (MS025) |
| Wendell Family Correspondence (MS088) |
| Wentworth, Hugh Hall and Joshua Wentworth (Larkin) (MS010) |
| Wentworth-by-the-Sea (MS060) |
| Wentworth-Gardner Association (MS043) |
| Wentworth Hotel - Harley Collection (MS102) |
| Whipple Traill Spence (MS074) |
| Wilson, Thomas C. Papers (MS035) |
| Woodbury, Charles Levi (MS014) |
