List of U.S. Routes
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This list of U.S. Routes is grouped by the 1- or 2-digit "parent" highway, although in some cases, a 3 digit highway is totally unrelated to its apparent "parent."
An asterisk * denotes three-digit highways that are not children of the 1- or 2-digit highways beneath which they are listed. NB: US Route 101 at the far west of the grid in California is a special case. It is actually considered part of the basic gridwork of 2-digit parent routes! Thus conceptually US RT 101 in California should NOT be read as 1-01 (one-oh-one) but rather as 101 (one-hundred-and-one), coming next as it does in the consistently ODD numbered gridwork of North-South routes after U.S. Route 99. This fits with US RT 2-01, 2-02, 3-02 in Maine which are the children of US RT (0)1 and US RT (0)2.
(d) denotes US Highways that have been decommissioned (sometimes replaced by Interstate highways).
(ns) denotes US Highways that were never signed as such.
A handful of 2-digit numbers have never been assigned to a US Highway route [1].