Bureau of Transportation Statistics (BTS)
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Table 5-2: Washington and U.S. Trailer and Semi-Trailer Registrations: 20001

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Type Washington United States
Total 582,888 21,541,490
Private and commercial 580,777 21,283,681
Commercial trailers2 58,939 4,685,606
Light farm trailers, car trailers, etc.3 430,757 14,113,392
House trailers 91,081 2,484,683
Publicly owned 2,111 257,809
Federal government 162 4,277
State, county, municipal government 1,949 253,532

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.

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.