Cannon's Alley was in the Northern Liberties. Based on the first two matchups being the same number, it was evidently one of those alleys so small that Clement Biddle either did not bother renumbering them according to his system, or (if numbers were little used anyway) he used the same kind of system as MacPherson, which he did in other alleys like Elfreth's.
(1785) #1 Cannon's Alley, Walter, Jacob
(1791) #1 Cannon's Alley, Walters, Jacob, labourer
(1785) #2 Cannon's Alley, Job, Joseph
(1791) #2 Cannon's Alley, Job, Joseph, stocking weaver
(1785) #3 Cannon's Alley, Blewet, James
(1791) #3 Cannon's Alley, Nap, Samuel, mariner
(1785) #4 Cannon's Alley, Colliday, Jacob
(1791) #4 Cannon's Alley, Hunter, Elizabeth, schoolmistress
(1791) #4 Cannon's Alley, Jacobs, John, porter