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Surname
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Region | Book Title | Catalog # | Notes |
| | Orme | Pennsylvania | PA | Welsh Founders of Pennsylvania | CC2230 |
| | Orme | Southern | MD | Early Families of Southern Maryland, Vol. 1 | WB0594 |
| | Orrell | Dorchester | MD | Colonial Families of the Eastern Shore of MD, Vol. 11 | D004 |
| | Ort | New Jersey | NJ | The Early Germans of New Jersey | CC940 |
| | Orth | Pennsylvania | PA | Pennsylvania Genealogies | CC1620 |
| | Osborn | Morris | NJ | Genealogies of New Jersey | G4058 |
| | Osborne | Cape May | NJ | Genealogies of New Jersey | G4058 |
| | Osborne | Cape May | NJ | Colonial Families of Cape May, NJ | D048 |
| | Osborne | Nassau | NY | Genealogies of New Jersey | G4058 |
| | Osborne | Suffolk | NY | Genealogies of New Jersey | G4058 | East Hampton |
| | Osborne | Union | NJ | Genealogies of New Jersey | G4058 |
| | Osborne | Virginia | VA | Adventurers of Purse and Person, VA 1607-1625 Vol. 2: G-P | G1497 |
| | Othoson | Cecil | MD | Colonial Families of the Eastern Shore of MD, Vol. 6 | D1958 |
| | Ott | Rockingham | VA | Men of Mark & Repres. Citizens of Harrisonburg & Rockingham Co. VA | CC9574 |
| | Outten | Accomack | VA | A Somerset Sampler, Families of Old Somerset Co. MD | L002 |
| | Outten | Somerset | MD | A Somerset Sampler, Families of Old Somerset Co. MD | L002 |
| | Outten | Worcester | MD | A Somerset Sampler, Families of Old Somerset Co. MD | L002 |
| | Overholtzer | Lancaster | PA | Early Fam. of Frederick Co MD & South Central PA | WB0364 |
| | Overton | Virginia | VA | Virginia Genealogies | CC2630 |
| | Overton-Harris-Day | Southside | VA | Southside Virginia Families, Vol. 1 | CC531 |
| | Owen | Pennsylvania | PA | Welsh Founders of Pennsylvania | CC2230 |
| | Owings, Capt. Richard | Maryland | MD | Provincial Families of Maryland, Vol. 1 | WB1555 |
| | Ozburn | Sussex | DE | Colonial Families of Delaware, Vol. 3 | D7609 |
| | Ozier | Cecil | MD | Colonial Families of the Eastern Shore of MD, Vol. 6 | D1958 |
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Pace | Virginia | VA | Adventurers of Purse and Person, VA 1607-1625 Vol. 2: G-P | G1497 |
| | Pace | Virginia | VA | Virginia Historical Genealogies |
| | Packard | Virginia | VA | Virginia Genealogies | CC2630 |
| | Paddison | Queen | MD | Colonial Families of the Eastern Shore of MD, Vol. 5 | D1956 |
| | Paddison | Talbot | MD | Colonial Families of the Eastern Shore of MD, Vol. 5 | D1956 |
| | Paden | Somerset | MD | Colonial Families of the Eastern Shore of MD, Vol. 12 | D011 |
| | Pagan/Pagon | Dorchester | MD | Colonial Families of the Eastern Shore of MD, Vol. 19 | D122 |
| | Page | Cape May | NJ | Colonial Families of Cape May, NJ | D048 |
| | Page | Kent | MD | Colonial Families of the Eastern Shore of MD, Vol. 1 | D1180 |
| | Page | Virginia | VA | Virginia Gen Along & Near the Lower Rappahannock 1607-1799 | WB0923 |
| | Paine | Virginia | VA | Virginia Genealogies | CC2630 |
| | Painter | Chester | PA | First Families of Chester County, PA, Vol. 2 | WB1977 |
| | Painter | Pennsylvania | PA | Welsh Founders of Pennsylvania | CC2230 |
| | Palmatary | Kent | DE | Colonial Families of Delaware, Vol. 1 | D1949 |
| | Palmer | Chester | PA | First Families of Chester County, PA, Vol. 1 | WB2055 |