How many Roman Catholic bishops are there in the U.S.?

According to the Official Catholic Directory, as of Jan. 1, 2010, there are 390 bishops and 59 archbishops.

There are 456 currently active and retired Catholic bishops in the United States:

271 active bishops:

• 4 Cardinal Archbishops
• 27 Archbishops
• 153 Diocesan Bishops
• 75 Auxiliary Bishops
• 12 Apostolic or Diocesan Administrators

185 retired bishops:

• 11 retired Cardinal Archbishops
• 25 retired Archbishops
• 101 retired Diocesan Bishops
• 48 retired Auxiliary Bishops

See the United States Conference of Catholic Bishops (USCCB) link for a list of the bishops' names.