Information from the Grand Rapids City Directories:
1906 - George W. Roup and Joseph Idema, grocers, 161 Turner Street
1907 - George W. Roup and Joseph Idema, grocers, 161 Turner Street - George resided 54 6th Avenue
1909 - George W. Roup, salesman, house 142 Dale Avenue
1910 - George W. Roup, grocer, reliable goods, 161 Turner Street; house 54 5th Avenue
1911 - George W. Roup, grocer, 196-198 Scribner, house 182 Dale Avenue
Also living at this address were: Grant U., driver for G. W. Roup; Lulu, clerk at G. W. Roup and Crystal
1912 - no longer listed in the directory.

See also his autobiography - "Autobiography of a Very  Common Fellow"