| Oklahoma Home Study: A licensed agency that provides both domestic and international adoption home study services and adoption post-placement services for Oklahoma. |
| One Church One Child Adoption Program: Adoption program in Florida in association with Florida Department of Children and Families. Offering a photolisting of Florida's waiting Children. |
| One World Adoptions: Non-profit, full service adoption agency licensed in the State of Georgia offering services including pre-adoption counseling, education, homestudies, assistance with dossier preparation, placement services and post placment services. |
| Open Adoption and Family Services: Private, nonprofit adoption agency with a focus on child-centered open adoptions. |
| Open Adoption Services: Brings mothers with an unexpected pregnancy together with qualified adoption families. |
| Open Arms Adoption Agency: Agency licensed in Louisiana providing home study services for domestic, international, or special needs placements; birthparent and adoptive family counseling; and post placement visits. |
| The Open Door Adoption Agency: Metro Atlanta agency helping children from Eastern Europe find loving, Christian families in the United states with programs in Russia, Latvia, Ukraine, and Tajikstan. |
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