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8 POPULATION SERVED

Of the total urban population of 83,766,379 in the United States in all incorporated places, as shown by the 1940 census, 54,378,200, or 65 percent, was resident in cities and urban places connected by the designated interstate system. These included all of the cities of 250,000 or more in es 49 of the 55 cities that had population between 100,000 and 250,000, 69 of the 107 cities that had population between 50,000 and 100,000, and 2,538 smaller cities, towns, and urban places.

Routes of the system traversed for some distance 1,160 of the 3,076 counties in the United States. In these counties traversed, the 1940 population was 23,953,461, or 50 percent of the total rural population of the country.



BRIDGES

On the entire system, as presently designated, there are 12,048 bridges. Of these structures 10,524 carry interstate routes over streams or natural water courses; 979 are over railroads; 384 span other highways. The remaining 161 are structures spanning two or more of the above kinds of crossings.