According to the National Black Catholic Congress, "270 million Catholics of African descent represent almost 25% of the one billion Roman Catholics throughout the world in more than 59 countries" (source). Almost 3 million of these live in the United States (source).
There are also many African and African-American saints. Here are just a few:
- 22 Martyrs of Uganda
- St. Anthony the Great of Thebes
- St. Antonio Vieira
- St. Athanasius of Alexandria ("the black dwarf")
- St. Augustine
- St. Benedict the Moor
- Sts. Felicitas and Perpetua
- St. Martin de Porres
- St. Monica
- St. Moses the Black
- St. Victoria
- St. Josephine Bakhita
You may be surprised to find that at least three popes were of African descent:
For a list of current and deceased African-American and Black bishops, go here. Wikipedia's List of African-American Firsts is a great tribute as well. For more on Blacks in the Catholic Church, see The National Black Catholic Congress and the USCCB Subcommittee on African American Affairs.