The following highways are numbered 305:

Canada

• Manitoba Provincial Road 305
• New Brunswick Route 305
• Nova Scotia Route 305
• Prince Edward Island Route 305
• Saskatchewan Highway 305

China

• China National Highway 305

India

National Highway 305

Japan

• Japan National Route 305

Philippines

• N305 highway (Philippines)

United States

• Interstates
  • Interstate 305 (multiple unsigned routes)
  • Interstate 305 (cancelled proposal)
• Arkansas Highway 305
• Connecticut Route 305
• Florida State Road 305 (former)
• Georgia State Route 305
• Hawaii Route 305
• Iowa Highway 305 (former)
• Kentucky Route 305
• Maryland Route 305
• Mississippi Highway 305
• Montana Secondary Highway 305
• Nevada State Route 305
• New Mexico State Road 305
• New York State Route 305
  • New York State Route 305 (former)
• North Carolina Highway 305
• Ohio State Route 305
• Pennsylvania Route 305
• Tennessee State Route 305
• Texas:
  • Texas State Highway 305
  • Texas State Highway Loop 305
  • Farm to Market Road 305
• Utah State Route 305 (former)
• Virginia State Route 305
• Washington State Route 305
• West Virginia Route 305

Other areas:

• Puerto Rico Highway 305
• U.S. Virgin Islands Highway 305