Keller Williams has been one of Century 21's top competitors. Keller Williams's headquarters is in Austin, Texas, and was founded in 1983. Like Century 21, Keller Williams also competes in the Real Estate Services field. Keller Williams generates 55% of Century 21's revenue.

RE/MAX is one of Century 21's top rivals. RE/MAX is a Public company that was founded in Denver, Colorado in 1973. Like Century 21, RE/MAX also works within the Real Estate Services industry. RE/MAX has 126,455 fewer employees vs. Century 21.

Coldwell Banker is perceived as one of Century 21's biggest rivals. Coldwell Banker was founded in 1906, and is headquartered in Madison, New Jersey. Like Century 21, Coldwell Banker also competes in the Real Estate Services sector. Coldwell Banker generates $500M less revenue vs. Century 21.