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(Last updated 2/28/2023)
Of the "main" US highways (i.e. the one- and two-digit routes), the longest nine were all east-west routes (6, 20, 50, 30, 40, 60, 70, 80, 12). And if we take the longest 16 highways, only one of them is a north-south route (US 1, shown in red here): 
That stands to reason, because the United States is roughly twice as wide from east to west as it is from north to south. So it makes sense that there would be more long east-west routes. But does the same hold true if we look at the "branch" routes of the system (i.e. the three-digit routes)?
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US 163 was commissioned by AASHO* at their June 1970 meeting. The designation ran from Kayenta AZ on the south up to Crescent Junction UT on the north (illustrated by the green lines on this map):
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