What is the longest street in San Francisco?

Geary Boulevard is the longest street in San Francisco, stretching from downtown all the way to the beach.

https://en.wikipedia.org/wiki/Geary_Boulevard

Geary is one of the city's longest streets, at a whopping 5.5 miles — it stretches from Market Street to the ocean. It's the main artery to the Richmond district, and it can take quite a while to get all the way out there by bus. Therefore, the San Francisco County Transit Authority is working on a plan to install a bus-only lane on Geary.

Facts: The longest street in the city is Mission Street -- 7.29 miles. The widest is Sloat Boulevard at 135 feet. The narrowest street is De Forest Way at 4 1/2 feet.


http://www.sfcvb.org/media/downloads/travel_media/sf_facts.pdf