Goldsboro is a community and former town in Seminole County, Florida. It was founded by the Freedmen's Bureau and later incorporated in 1891. One of the oldest African-American founded communities in the United States, it was established only a few years after nearby Eatonville. Angola, Florida, a settlement of escaped slaves, was established during Span…Goldsboro is a community and former town in Seminole County, Florida. It was founded by the Freedmen's Bureau and later incorporated in 1891. One of the oldest African-American founded communities in the United States, it was established only a few years after nearby Eatonville. Angola, Florida, a settlement of escaped slaves, was established during Spanish rule in Florida. In 1911, the community was annexed into Sanford, Florida.