1. Canada

2. United States

The following highways are numbered 521:

Canada

• Alberta Highway 521

United States

• U.S. Route 521
• Maryland Route 521
• County Route 521 (New Jersey)
• Ohio State Route 521
• South Carolina Highway 521

• The Crick, Brenner et al. experiment
• The Cricket on the Hearth
• The Crickets
• The Crimean War
• The Crime of Father Amaro
• The crime of father amaro
• The Criminality of Women
• The Criminals
• The Criminal Under My Own Hat
• The Crimson Chin
• The crimson fists
• The Crimson Ghost
• The Crimson Idol
• The Crimson King
• The Crimson Permanent Assurance
• The Crimson Pirate
• The Crimson White
• The Crippled God (novel)
• The Crippled Masters
• The Crisis
• The Crisscross Shadow
• The Criterion Collection
• The Critic
• The Critics
• The Critique of Judgement