List of highways numbered 666

The following highways are numbered 666:

Belgium

• The pilgrimage centre of Banneux in Belgium is located on the N666 road.

Canada

• Alberta Highway 666
• Ontario Highway 666 (former)

Ireland

• R666

Italy

• Strada regionale 666 di Sora (formerly strada statale 666 di Sora)

Netherlands

• Provinciale weg 666

Philippines

• N666 highway (Philippines)

Sweden

• Länsväg 666, in Uppland, eastbound from Alunda.

United Kingdom

• A666 road

United States

• U.S. Route 666 (former, renumbered in 2003 to US 191 and US 491)
• Florida State Road 666
• Maryland Route 666 (former)
• Ohio State Route 666
• Pennsylvania Route 666
• Puerto Rico Highway 666
• Farm to Market Road 666