1. Canada

2. Japan

3. Korea, South

4. United Kingdom

5. United States

The following highways are numbered 451:

Canada

• Ontario Highway 451, commonly called the Queen Elizabeth Way.

Japan

• Japan National Route 451

Korea, South

• Jungbu Naeryuk Expressway Branch

United Kingdom

• {{ukroadsmall|451}} from Stourbridge to Great Witley

United States

• Florida State Road 451
• Kentucky Route 451
• Maryland Route 451 (former)
• Oregon Route 451
• Tennessee State Route 451
• Wyoming Highway 451

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