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As of 2012, the US interstate highway system includes almost 50,000 miles.
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As of 2006, there were 46,876 miles of roadway in the Dwight D. Eisenhower National System of Interstate and Defense Highways.
The length of an interstate highway can vary significantly, as there are thousands of miles of interstate roadways across the United States. The entire Interstate Highway System spans approximately 48,000 miles. Individual interstate routes can range from a few miles to over 3,000 miles, like Interstate 90, which is the longest in the system.
47,856 miles
The distance from the Interstate Highway at the Kentucky border and Interstate Highway 75 a the Michigan border is 211.5 miles. Like most of the Interstate Highway System, the exact distance is subject to change as it evolves and road construction continues to improve both traffic flow and road safety.
Using the Interstate Highway system. it is about 185 miles.
Texas has the most interstate highway miles with 3,233.45 miles. . California has the second most with 2,455.74 miles.