Juanita Eason b. 1921 IL listed in aunt's household Marion, Williamson Co IL 1930-1940 then in St Louis in 1940 as inmate of Good Shephard Convent which states she lived in Marion IL in 1935...doesn't mean she was born there but probably was. So yes she was listed twice within 6 days.

1940 census provides data of where someone was residing in 1935. Ella/Ellen Eason Haley is listed in census in Williamson Co, wife of George, beginning 1910 census.

Name: Effie Eason
Event Date: 22 Oct 1926
Event Place: Marion, Williamson, Illinois
Gender: Female
Age: 37
Birth Year (Estimated): 1889
Birth Date: 25 Nov 1888
Birthplace: Illinois
Father's Name: George Eason
Father's Birthplace: Illinois
Mother's Name: Mccama
Mother's Birthplace: Illinois
Occupation: Housework
Residence Place: Crab Orchard Twp.
Burial Date: 23 Oct 1926
Digital Folder Number: 4008183 , Image Number: 335 , GS Film number: 1613445 , Reference ID: pg41564, cn136
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Illinois Deaths and Stillbirths, 1916-1947
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"Illinois Deaths and Stillbirths, 1916-1947," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/N3BT-LJM : accessed 14 January 2015), Effie Eason, 22 Oct 1926; Public Board of Health, Archives, Springfield; FHL microfilm 1,613,445.

George W Eason married Charlotta McKemie 30 Aug 1872 Franklin Co IL

EASON, GEORGE W & MCKEMIE, CHARLOTTA 1872-08-30 003 0589 FRANKLIN
http://www.ilsos.gov/isavital/marriageSearch.do

HARWOOD, ELVIS & EASON, LOTTIE 1894-12-21 H 271 WILLIAMSON
...listed in Williamson Co 1900 census as *Wood