Don't order the microfiche until you make sure that ancestry.com has all the pages posted. I am dead serious. Check in the upper right-hand corner and make sure each page number has an "A" and a "B" page. Also, if you have the family in the 1910 and 1930 Censuses, compare their addresses. I know it's a 20 year span, but it might help. Are there any City Directories or phone books for the area you need? If you have not tried that, it might be a possibility.