America’s transportation system continues to change along with the population, work force, and economy. The following table puts those changes in perspective:

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Context 1980 2005
Resident population (thous.) 226,542 296,410
Total area (thous. sq. mi.)a 3,619 3,794 (2000)
Total civilian labor force (thous.) 106,940 146,320
Real gross domestic productb $5.2 trillion $11.0 trillion
Median household incomeb,d $34,007 $41,475
Average household incomeb,d $40,445 $56,108
Average household expendituresb,c $33,915 (1984) $41,625
Number of households (thous.) 80,776 111,091
Life expectancy at birth (years) 73.7 77.5 (2003)

a 1980 data include inland water only. Data for 2000 include inland water, coastal water, Great Lakes, and territorial water. The Census Bureau tabulates area data for the decennial census years only.

b 2000 chained dollars (see Glossary for definition).

c Earliest year available is 1984.

d BTS computations, November 2006.

Sources: Area-U.S. Department of Commerce (USDOC), U.S. Census Bureau, Statistical Abstract of the United States: 2006, available at, as of Nov. 2004. GDP-USDOC, Bureau of Economic Analysis, available at, as of Oct. 2006. Population, number of households, median and average household income-USDOC, Census, available at, as of Oct. 2006. Average household expenditures, labor force-U.S. Department of Labor, Bureau of Labor Statistics, available at, as of Nov. 2006. Life expectancy-Centers for Disease Control and Prevention, available at, as of Oct. 2006.