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 2004
Resident population (thous.) 226,542 293,655
Total area (thous. sq. mi.)a 3,619 3,794 (2000)
Total civilian labor force (thous.) 106,940 147,401
Real gross domestic productb $5.2 trillion $10.8 trillion
Median household incomeb,d $34,007 $41,008
Average household incomeb,d $40,445 $55,917
Average household expendituresb,c $33,915 (1984) $40,089
Number of households (thous.) 80,776 113,146
Life expectancy at birth (years) 73.7 P77.6 (2003)

a 1980 data include inland water. Since 1990, the data include inland water, coastal water, and Great Lakes, but exclude 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 2005.

Key: P = preliminary data.

Sources: Area-U.S. Department of Commerce (USDOC), U.S. Census Bureau, Statistical Abstract of the United States: 2004-2005, available at, as of Nov. 2005. GDP-USDOC, Bureau of Economic Analysis, available at, as of Oct. 2005. Population, number of households, median and average household income-USDOC, Census, available at, as of Oct. 2005. Average household expenditures, labor force-U.S. Department of Labor, Bureau of Labor Statistics, available at, as of Nov. 2005. Life expectancy-Centers for Disease Control and Prevention, available at, as of Nov. 2005.