Transportation Statistics
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Bureau of Transportation StatisticsStatistical arm of the U.S. Department of Transportation; collects data mainly down to the state-level.
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National Transportation StatisticsOver 260 data tables with source notes and supplementary documentation
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Washington State Maps & DataFrom the Washington State Department of Transportation
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SAGE StatsCollection of data measures spanning all U.S. states, counties, cities, metropolitan areas, and zip codes. Data goes back more than 20 years. Covers the economy, education, crime, government finance, health, population, religion, social welfare, and transportation.