The following highways are numbered 434:
Canada
- Manitoba Provincial Road 434
- Newfoundland and Labrador Route 434
Japan
United States
- Florida State Road 434
- Montana Secondary Highway 434
- New York State Route 434
- New York State Route 434 (former)
- Pennsylvania Route 434
- Puerto Rico Highway 434
- Texas:
- Wyoming Highway 434
Preceded by 433 | Lists of highways 434 | Succeeded by 435 |