The following highways are numbered 423:
Canada
- Manitoba Provincial Road 423
Japan
United States
Florida State Road 423
Louisiana Highway 423
Maryland Route 423
New Mexico State Road 423
New York State Route 423
Ohio State Route 423
Pennsylvania Route 423
Puerto Rico Highway 423
Farm to Market Road 423
| Preceded by 422 |
Lists of highways 423 |
Succeeded by 424 |
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