We estimate marriage rates for enslaved African Americans using unique hospital records that report marital status for both free and enslaved patients. We find that marriage rates increased with age, that females had higher marriage rates than males, and that relatively more enslaved African Americans than whites were married, a result we partly attribute to the demographic composition of the hospital population. In addition, the admission records allow us to identify those slaves owned by slave traders. We find relatively high marriage rates among enslaved African Americans but significantly lower marriage rates for those slaves owned by traders, a result we attribute to the demographic composition of traded slaves and marital disruption caused by the slave trade. Comparisons with other postbellum sources provide suggestive support for the antebellum marriage patterns found in these hospital data.