- A548 between A470 and B5382, Conwy (Grid ref SH800617)
- A548 between B5382 and A544, Conwy (Grid ref SH900699)
- A548 between A544 and Lon Dioion, Abergele, Conwy (Grid ref SH936740)
- A548 between Lon Dirion and A547, Conwy (Grid ref SH943769)
- A548 between A55 and A548 Marine Rd, Conwy (Grid ref SH945785)
- A548 between A547 and A55, Conwy (Grid ref SH945777)
- A548 between A548 spur and A548 spur, Conwy (Grid ref SH946783)
- A548 between A548 Dundonald Ave and A55, Conwy (Grid ref SH947782)
- A548 between A55 and Conwy boundary, Conwy (Grid ref SH983800)
- A548 between Denbighshire boundary and A548 merge, Denbighshire (Grid ref SJ003810)
- A548 between A548 Wellington Rd (Ffordd Wellington) and A525 Vale Rd Bridge, Denbighshire (Grid ref SJ008812)
- A548 between A548 Elwy St and A548 Bath St (Stryd Y Baddon), Denbighshire (Grid ref SJ009814)
- A548 between A525 Vale Rd Bridge and A548 Russell Rd (Ffordd Russell), Denbighshire (Grid ref SJ010814)
- A548 between A548 Bath St (Stryd Y Baddon) and A547, Denbighshire (Grid ref SJ054830)
- A548 between A547 and Denbighshire boundary, Denbighshire (Grid ref SJ080833)
- A548 between B5121 and Flintshire boundary, Flintshire (Grid ref SJ100835)
- A548 between B5121 and A5026, Flintshire (Grid ref SJ200772)
- A548 between A5026 and Aber Rd, Flint, Flintshire (Grid ref SJ227746)
- A548 between Aber Rd and A5119, Flintshire (Grid ref SJ242733)
- A548 between A5119 and Caesar Avenue, Flint, Flintshire (Grid ref SJ250726)
- A548 between Caesar Avenue, Flint and Parkway, Shotwick, Flintshire (Grid ref SJ300719)
- A548 between Parkway and A550, Flintshire (Grid ref SJ332710)
- A548 between A494 / A550 and Flintshire boundary, Flintshire (Grid ref SJ340690)
- A548 between Wales/England border and A5480, West Cheshire (Grid ref SJ387669)
- A548 between A5480 and A5268, West Cheshire (Grid ref SJ400663)