Could someone help me search the 1920 federal census? I have not been able to locate my ggrandfather and his wife in the 1920 federal census. Charles Walter Mitchell and his wife Irena. Charles b. 1859 GA; and Irena b. 1865 TX

They owned land in Lamar County TX between 1900 and 1920; however, by 1920 - most family members moved to Omaha to work in the meat packing plants. One of his daughters (Anna Mae Mitchell Graham b. 1886 TX)is living in Des Moines, IA in 1920.

I've tried a variety of spelling combinations: Charles Walter Mitchell; C.W. Mitchell; Charlie Mitchell; Charles W. Mitchell; Charlie W. Mitchell; C. Mitchell. And I have searched TX, NE, and IA.

Thanks for your time and help.
Diane Alston Turner