What is the full street address of Sheldon and Leonard's apartment?

Sheldon and Leonard’s apartment is officially given the street address 2311 North Los Robles Avenue.

The address belongs to Apartment 4A, where Sheldon Cooper and Leonard Hofstadter live for much of The Big Bang Theory. It is also associated with the fictional Pasadena apartment building that contains Penny’s Apartment 4B across the hall. The address is stated within the show and is part of its recurring setting, alongside the famously unreliable elevator and the long staircase.

A common mix-up comes from the fact that the address is fictionalized. The building shown on screen was created through studio sets and exterior filming locations, while the real-world geography of Pasadena does not line up perfectly with the views seen from the apartment. Some location investigations have connected exterior imagery with other Pasadena buildings, but those production locations do not replace the address established in the series.

Therefore, the quiz answer refers to the in-universe address, not a verifiable apartment where the characters actually live. “North,” “Los Robles,” and the number 2311 are all essential parts of the canonical street address.