Bus drivers held about 653,000 jobs in 2004. About 35 percent worked part
time. Around 71 percent of all bus drivers were school bus drivers working
primarily for school systems or for companies providing school bus services
under contract. Most of the remainder worked for private and local
government transit systems; some also worked for intercity and charter bus
lines.
Source: Bureau of Labor
Statistics, U.S. Department of Labor, Occupational Outlook
Handbook