The following highways are numbered 789:

• Alberta Highway 789 (former)
• 
  Saskatchewan Highway 789

• U.S. Route 789 (former proposal)
• Arizona State Route 789 (former)
• Colorado State Highway 789 (former)
• Florida State Road 789
  • County Road 789 (Manatee County, Florida)
  • County Road 789 (Sarasota County, Florida)
    • County Road 789A (Sarasota County, Florida)
• Georgia State Route 789 (former proposal)
• Louisiana Highway 789
• Mississippi Highway 789
• Montana Highway 789 (former)
• Nevada State Route 789
• New Mexico State Road 789 (former)
• Farm to Market Road 789
• Virginia State Route 789
• Wyoming Highway 789