More Information:

About the John R. Winkler Family:

Marriage date from Columbia Co. Marriages Book B.

About John R. Winkler:

Possible Civil War records for John R. Winkler:

COMPANY A
4TH BATTALION ARKANSAS INFANTRY
WINKLER, R. Pvt - Enl 22 Sep 1861 at Little Rock, AR. Discharged 8 Nov 1861 at Little Rock, AR (?) Captured at Island #10. Present through Jun 1863. J. R. Winkler is listed as an alternate name for R. Winkler in this record.

Also:
WINKLER, J.R. Pvt - Enl 1 Dec 1862 at Little Rock, AR. Deserted 9 Sep 1863.

No proof that these records are for John R. Winkler, husband of Martha Hardy.
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1900 Census gives birth date of June, 1832. Occupation: day laborer.
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About Martha Ann Hardy:

Found in 1880 Census, AR, Columbia Co., Buena Vista TS, p. 218, img. 4. (Last name looks like "Winstler".)
Living next to sister Susan C. Thomas and brother William E. Hardy.
Jno. R. Winkler 34 TN TN TN Farm Laborer
Martha Winkler 29 AR TN VA
John M. Winkler 11 AR TN AR
Ida E. Winkler 9 AR TN AR
Mary E. Winkler 6 AR TN AR
Wm. S. Winkler 3 AR TN AR
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Found in 1900 Census, AR, Lafayette Co., French TS, ED 112, sh. 7, img. 1. It states that Martha has had 9 children, 4 living.
John R Winkler 68
Martha Winkler 61
Samuel W Winker 26
Carrie F Winker 19
George H Winker 14
Cassius R Winker 9

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Found in 1910 Census, AR, Lafayette Co., Roane, ED 94, sh. 11B. Age: 64.
M W Winkler 64
William R Winkler 26
Cassius Winkler 15
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Found in 1920 Census, AR, Lafayette Co., Roane, ED 120, sh. 19A.
Martha Winkley 79
Sam Winkley 46
Caswell Winkley 23 (this is probably Cassius)
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Found in 1930 Census, AR, Lafayette Co., Roane, ED 13, sh. 8A.
Sam Winkler 54
Martha Winkler 93
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About John M. Winkler:

Name, birth date/place from 1880 Census. Not in 1900 Census.

About Ida E. Winkler:

Name, birth date/place from 1880 Census. Not in 1900 Census.

About Mary E. Winkler:

Name, birth date/place from 1880 Census. Not in 1900 Census.

About William Samuel Winkler:

Name, birth date, and birth place from 1880 and 1900 Census.
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Found in 1910 Census, AR, Lafayette Co., Roane, ED 94, sh. 11B, living with mother and brother Cassius, name given as William R, age 26.
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Found in 1920 Census, AR, Lafayette Co., Roane, ED 120, sh. 19A, living with mother and brother Cassius, name given as Sam, age 46.
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Found in 1930 Census, AR, Lafayette Co., Roane, ED 13, sh. 8A, living with mother, name given as Sam, age 54, unmarried, occupation farmer.
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About George H. Winkler:

Name and birth date from 1900 Census.