We went through all 575 pages of The Postal Service Guide to U.S. Stamps,
31st Edition. There have been stamps related to children, teachers and the
trucking industry, even one about a school bus, but none on school bus
drivers. Here are some of the stamps we found.

Scott Catalog Number 1007
American Automobile Association (AAA)
(Picture of children and a school crossing guard)
3 cents
Issued 1952

Scott Catalog Number 1025
American Trucking Industry
(Picture of truck with driver)
3 cents
Issued 1953

Scott Catalog Number 1093
School Teachers
3 cents
Issued 1957

Scott Catalog Number 1206
Higher Education
4 cents
Issued 1962

Scott Catalog Number 1463
Parent Teachers Association
8 cents
Issued 1972

Scott Catalog Number 1549
Retarded Children
10 cents
Issued 1974

This stamp is © USPS.
Scott Catalog Number 1772
International Year of the Child
15 cents
Issued 1978

This stamp is © USPS.
Scott Catalog Number 2123
School Bus
(Part of the "Transportation" series showing different vehicles over history.)
3.4 cent (Probably used on bulk mail or non-profit mail)
Issued 1985

This stamp is © USPS.
Scott Catalog Number 2951-2954
Kids Care Earth Day (Set of 4 stamps)
(Contest to have school children design the stamps)
32 cents
Issued 1995

This stamp is © USPS.
Scott Catalog Number 3125
Helping Children Learn
(Honoring people who mentor children)
32 cents
Issued 1997

This stamp is © USPS.
Scott Catalog Number 3414-3415
Stampin' The Future
(Contest to have school children design the stamps)
33 cents
Issued 2000