This report from the Bureau of Justice Statistics provides demographic characteristics on the death row population through 2003.

Highlights include the following:
At yearend 2003, 37 States and the Federal prison system held 3,374 prisoners under sentence of death, 188 fewer than at yearend 2002.
Of those under sentence of death, 56% were white 42% were black, and 2% were of other races.
Forty-seven women were under sentence of death in 2003, up from 38 in 1993.