George Martin
From America's Wars: U.S. Casualties and Veterans:
http://www.infoplease.com/ipa/A0004615.html
Civil War (1861–1865)
Total servicemembers (Union) 2,213,363
Battle deaths (Union) 140,414
Other deaths in service (nontheater) (Union) 224,097
Nonmortal woundings (Union) 281,881
Total servicemembers (Conf.) 1,050,000
Battle deaths (Conf.) 74,524
Other deaths in service (nontheater) (Conf.) 59,297
Nonmortal woundings (Conf.) unknown