After searching the TN census records, it appears I found your David Q Allen in Benton Co, TN from the 1850 thru 1920 census records. David's wife is listed as both Eva C. & Catherine on different census years but the age/place of birth remain the same.
Then I found the amazing site,listed below,on Google.com.The bummer is that I could not find the name of the author or an email for contact. Only their 'code' dmfd305. Hopefully you will be able to contact them; maybe thru Google.com?? They have done a great job listing census records. But atleast you have a death date and with luck can send for a death record on him from Benton County, TN.
Notice they list David as David Quillen Allen in one place and David Quinton Allen in another.....same man.You will also find a submission on him at Familysearch.org.
Here is a TREE found on Rootsweb.com.Although most of the info is the same, there are some differences. This site lists the Cemetery name for David. Both sites have the ability to print out.....good idea to do so & compare side by side.Trees on the WEB are great place to start but remember you will need to document the info yourself. Or check with the submitter to see if they are willing to share documentation. http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=farmerjo&id=I00468http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=farmerjo&id=I00468
Children of David Q Allen I found on the census records: George Allen abt 1872 James D. Allen bn Dec 1873 Homer (Jesse) Allen bn 27 Nov 1875 Eva R. Allen bn Nov 1877 Eliza (Lizzie) Allen bn Apr 1880 *On the 1900 census his wife states she had 6kids/5 alive.*
Hope something here helps you connect in your search, Good Luck, Marsha