Ancestry.com has added 200 years of Caribbean slave records with help from the Virgin Islands Social History Associates. You can access the records free through the end of July (you’ll need to register for a free account).
So far, the collection includes St. Croix slave lists from 1772 to 1821 and population censuses (1835 to 1911), which together have information on more than 700,000 slaves, owners and family members.
The slave lists aren’t yet indexed, so you can’t search by name, but you can browse the record images by year. Here’s an example:
You can search the census records. Most are in English, but some are in Danish—the islands became a Danish colony in 1754; the United States purchased them in 1917.