If you have not examined the original census sheet, try to find it. HeritageQuest might be available free thru your local or historic/genealogical library. Very easy to use, but apparently index for Head of Household only, not children & spouse like FamilySearch.org.
It has really excellent images of the original sheets which can be enlarged, switched to white-on-black for added legibility, and downloaded. Also you can look up and down that sheet, and forward and back on other sheets to see other families in the same locality. Could be very important.
When census records are transcribed, often some of the data are omitted, like naturalization.
Also, a feature of FindAGrave.com has been very useful for me in trying to find surname variations. You can name search with * for wild card, and use variations of name spellings to see what works, or not. FAG has only volunteer-contributed info so it is not "complete" but is very large database, including overseas cemeteries for war-time casualities.