The Cardinals represent the original clergy - bishops, priests, and deacons - of the churches in and around Rome. Each is assigned a titular church in Rome.
As I recall the Cardinal Bishops are high level members of the Vatican Curia. Most of the Cardinal Deacons are also members of the Curia. Most of the Cardinals who serve outside Rome are Cardinal Priests. I think there are seven Cardinal Bishops and seven Cardinal Deacons. The rest are Cardinal Priests. **
Catholic-Hierarchy has the lists of Cardinals, in order of precedence:
Cardinal Bishops (6+3 Patriarchs),
Cardinal Priests (145),
Cardinal Deacons (28).
The
Wiki article seems accurate, since there have been changes since the
Catholic encyclopedia article.