1.  Illinois Statewide Marriage Index, 1763–1900:

Claxton, David

Straub, Anna

05/18/1875

Book E, p. 26

De Kalb Co.

2.  1870 Census Images (online at Ancestry.com; Image #30 of 32):  Malta P.O., Malta, DeKalb Co., IL, p. 461B, PN 30, enumerated 12 Sep 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):¤•

1870:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
1	2	3	4	5	6	7	9	10	11	12	19
213	205	Brown George	35	M	W	Day Laborer	100	NY			/
		[George's wife and child]
		Strub Jennie	16	F	W	Domestic Servt		Canada	/	/

Her name is definitely "Jennie Strub" and her age is definitely 16, but surely she is Anna.  As a servant in the household, the informant may not have known her well, and I've seen worse errors in the census, especially with regard to boarders.  Otherwise, I cannot account for Anna in 1870, nor can I account for Jennie other than in this one record.  There were no other STRAUB/STROUB/STRUB/etc. families in DeKalb County at this time, except for Anna and her presumed sibllings, and there were no other STRAUB/STROUB/STRUB/etc. families from Canada in all of Illinois. 

3.  1880 Census Images (online at Genealogy.com, Image #6 of 26):  Malta, DeKalb Co., IL, Roll 202 (Book 1), p. 114D, PN 8, SD 2, ED 33, 78/78, enumerated 10 Jun 1880, official enumeration date 1 Jun 1880 (extracted by Diana Gale Matthiesen):¤

1880:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).

1

2

3

4

5

6

8

9

10

13

24

25

26

78

78

Claxton David

W

M

34

/

Carpenter

Eng

Eng

Eng

_______ Annie

W

F

37

Wife

/

Keeping House

Can

Eng

Eng

_______ Berlie? H

W

F

4

Dau

/

Ill

Eng

Can

_______ Dora?

W

F

3

Dau

/

Ill

Eng

Can

_______ Artie?

W

F

1

Dau

/

Ill

Eng

Can

Listed between Annie's presumed sister, Charlotte STRAUB, and Elizabeth (__?__) STRAUB. 

4.  1890 Census:  the 1890 Census Population Schedules were destroyed.

5.  1900 Census Index/Images (online at Genealogy.com, Image #23 of 25):  Malta Village, Malta Twp., DeKalb Co., IL, Roll 296 (Book 2), p. 167A, PN 12A, SD 2, ED 10, enumerated 25 Jun 1900, official enumeration date 1 Jun 1900 (extracted by Diana Gale Matthiesen):¤

1900:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	27
259	263	Claxton David	Head	W	M	May 1845	55	M	25			England	England	England	1864	36	Na	Carpenter	0		Y	Y	Y	O	H
		_______ Anna	Wife	W	F	Feb 1855	45	M	25	6	6	Canada	Canada (Eng)	England							Y	Y	Y
		_______ Grace	Dau	W	F	Jun 1882	17	S				Illinois	England	Canada				At School		9
		_______ Isreal	Son	W	M	Feb 1885	15	S				Illinois	England	Canada				At School		9
		_______ Howard	Son	W	M	Jul 1893	6	S				Illinois	England	Canada				At School		9

Listed next to David's presumed brother, Horace CLAXTON, who is married to Anna's presumed sister, Charlotte STRAUB. 

6.  Messages posted to the CLAXTON Surname Board (online at Ancestry.com).