4 is a number in the Arabic Numeral System—the most commonly used numeral system in the world. The number 4 first sponsored Sesame Street in its second week, beginning with episode 0006. The number 4 has since sponsored many episodes of Sesame Street and was featured prominently in episode 0734.

Songs about 4

• "Four" (Little Jerry and the Monotones)
• "Four Furry Friends" (Herry Monster, Oscar the Grouch, Cookie Monster and Grover)
• "I Just Adore Four" (Big Bird and the Tarnish Brothers)
• "Four Fun" (Big Bird)
• "Four Song (Song of Four)"
• "Jazz #4"
• "Pinball Number Count"
• Donnie Budd -- "Four Lions at my Door"
• Number Guy -- "How Many Elephants Can You Fit in a Room?"
• "1234"

Skits about 4

• The Mad Painter #4
• Number of the Day
• Sesame Street Floating Face Sketches