|Type||District of Columbia||United States|
|Private and commercial||934||21,283,681|
|Light farm trailers, car trailers, etc.3||854||14,113,392|
|State, county, municipal government||342||253,532|
1 The completeness of data on trailer registrations varies greatly among states. Data are reported to the extent available and, in some cases, are supplemented by estimates of the Federal Highway Administration.
2 This row includes all commercial type vehicles and semi-trailers that are in private or for-hire use.
3 Several states do not require the registration of light farm or automobile trailers.
4 Some states may not require the registrations of mobile homes and house trailers. In states where this classification is not available, house trailers are included with light car trailers.
KEY: U = data are unavailable.
NOTE: Mobile homes and house trailers are shown for states that require registration and are able to segregate them from other trailers. In states where this classification is not available, house trailers are included with light car trailers.
SOURCE: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics 2000, Washington, DC: 2001, table MV-11.