US 20 and US 6 from Lakewood to Public Square in Cleveland, OH.
While Colorado signs concurrencies badly, there's at least a couple of examples here:
US 40/287 along I-70 from eastern Aurora to Limon
US 40 along I-70 (and technically US 6) from Empire Junction east to the foot of Floyd Hill (east of Idaho Springs)
It's a super-technicality, but US 87/I-25 works from Raton, NM through Colorado to Cheyenne, WY.
US 85 and I-25 also works on the north side of Cheyenne, WY.
US 30 and I-80 in Wyoming happens a couple times: from Green Bluffs to Cheyenne, from Cheyenne to Laramie, from Walcott to Little America. US 287 overlaps both I-80/US 30 from Walcott to Rawlins.