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Surname
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Region | Book Title | Catalog # | Notes |
| | Norwood | Southside | VA | Southside Virginia Families, Vol. 2 | CC532 |
| | Norwood | Virginia | VA | Virginia Historical Genealogies |
| | Norwood | Virginia | VA | Virginia Historical Genealogies |
| | Nowell/Noel | Caroline | MD | Colonial Families of the Eastern Shore of MD, Vol. 16 | D057 |
| | Nowland | Cecil | MD | Colonial Families of the Eastern Shore of MD, Vol. 6 | D1958 |
| | Noyes | Newbury | MA | Ancestral Lines from Maine to Virginia | CB001 |
| | Numbers | Cecil | MD | Colonial Families of the Eastern Shore of MD, Vol. 6 | D1958 |
| | Numbers | Kent | DE | Colonial Families of Delaware, Vol. 9 | D0861 |
| | Nuner/Nooner | Dorchester | MD | Colonial Families of the Eastern Shore of MD, Vol. 19 | D122 |
| | Nunez | Sussex | DE | Colonial Families of Delaware, Vol. 3 | D7609 |
| | Nunn | New Jersey | NJ | The Early Germans of New Jersey | CC940 |
| | Nuthall | Southern | MD | Early Families of Southern Maryland, Vol. 2 | WB0736 |
| | Nutter | Dorchester | MD | Colonial Families of the Eastern Shore of MD, Vol. 7 | D1959 |
| | Nutter | Somerset | MD | Colonial Families of the Eastern Shore of MD, Vol. 7 | D1959 |
| | Nutter | Sussex | DE | Colonial Families of the Eastern Shore of MD, Vol. 7 | D1959 |
| | Nutter | Sussex | DE | Colonial Families of Delaware, Vol. 3 | D7609 |
| | Nutting | York | VA | Colonial Families of York County, Virginia, Vol. 1 | D7701 |
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O'Bryan | Queen | MD | Colonial Families of the Eastern Shore of MD, Vol. 4 | D1498 |
| | O'Bryan | Talbot | MD | Colonial Families of the Eastern Shore of MD, Vol. 4 | D1498 |
| | O'Dear | Somerset | MD | Colonial Families of the Eastern Shore of MD, Vol. 22 | D1225 |
| | Oechner | York | PA | Early Families of York Co. PA Vol. 2 | WB11217 |
| | O'Ferrall | Rockingham | VA | Men of Mark & Repres. Citizens of Harrisonburg & Rockingham Co. VA | CC9574 |
| | Offley | Kent | DE | Colonial Families of Delaware, Vol. 1 | D1949 |
| | Offley | Virginia | VA | Adventurers of Purse and Person, VA 1607-1625 Vol. 2: G-P | G1497 |
| | Ogden | New Jersey | NJ | Pioneer Families of Northwestern New Jersey | CC9157 |
| | Oldham | Cecil | MD | Colonial Families of the Eastern Shore of MD, Vol. 6 | D1958 |
| | Oldham | Queen | MD | Colonial Families of the Eastern Shore of MD, Vol. 5 | D1956 |
| | Oldham | Talbot | MD | Colonial Families of the Eastern Shore of MD, Vol. 5 | D1956 |
| | Oliphant | Monmouth | NJ | Genealogies of New Jersey | G4058 |
| | Oliver | Essex | NJ | Genealogies of New Jersey | G4058 |
| | Oliver | Kent | MD | Colonial Families of Delaware, Vol. 1 | D1949 |
| | Oliver | Pennsylvania | PA | Welsh Founders of Pennsylvania | CC2230 |
| | Oliver | Union | NJ | Genealogies of New Jersey | G4058 |
| | Omelia | Queen | MD | Colonial Families of the Eastern Shore of MD, Vol. 4 | D1498 |
| | Omelia | Talbot | MD | Colonial Families of the Eastern Shore of MD, Vol. 4 | D1498 |
| | Omohundro | Westmorelan | VA | Colonial Families of Northern Neck of VA, Vol. 1 | D1987 |
| | O'Neil-Robins | Virginia | VA | Adventurers of Purse and Person, VA 1607-1625 Vol. 2: G-P | G1497 |
| | Onion, Zaccheus B. | Maryland | MD | Provincial Families of Maryland, Vol. 1 | WB1555 |
| | O'Reilly/Reilly | York | PA | Early Fam. of Frederick Co MD & South Central PA | WB0364 |