Which Manhattan avenue does the number 1 subway run on?

In Lower Manhattan, the 1 train (of the 1-2-3, the red line) runs up and down West Broadway, then Varick Street, and then 7th Avenue South, starting at Houston Street. It runs up and down 7th Avenue South from Houston Street to 11th Street, when 7th Avenue South becomes regular 7th Avenue. From 11th Street to 59th Street, it runs up and down 7th Avenue. Above 59th Street, almost all the way to the tip of Upper Manhattan, it runs up and down Broadway.