Most employees in the truck transportation and warehousing industry work in small establishments. Over 85 percent of trucking and warehousing establishments employ fewer than 20 workers. Consolidation in the industry has reduced the number of small, specialized firms. About 10 percent of truck drivers and driver/sales workers operate their own business. Although these owner-operators constantly enter the industry each year, intense competition has caused many to fail.

Trucking and warehousing establishments are found throughout the United States, with a higher concentration around the major interstate highways and in heavily industrialized regions of the country such as in California, New Jersey, and Texas.