1a.  Jordan R. Dodd, ed.  1998.  Marriage Index: Ohio, 1851-1900.  Liahona Research, Orem, UT (Broderbund CD-236):

Cupp, Aaron

Switzgable, Susanna

6 Nov 1859

Fairfield Co.

1b.  Email from Judy Winzenz, citing the "Genealogical Abstracts" of the Lancaster Gazette:

Aaron H. Cupp and Susan Swetzealle, both of Pleasant Township were married 6 Nov 1859

2.  1860 Census Index/Images (online at Genealogy.com; Image #15 of 55):  Lancaster P.O., Pleasant Twp., Fairfield Co., OH, Roll 960 (Book 1), p. 113A, PN 233, 1540/1512, enumerated 25 Sep 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):¤•

Aaron Cupp	25	M		Farm hand			Ohio
Susannah "	19	F				800	"

Listed three households from Aaron's parents, David & Catharine (HOOVER) CUPP. 

3.  1870 Census Index/Images (online at Genealogy.com, Image #53 of 60):  Lancaster P.O., Pleasant Twp., Fairfield Co., OH, p. 301A, PN 58, 351/356, enumerated 25 Aug 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):¤•

Cupp Aaron	35	M	W	Works on mill		125	Ohio
____ Susan	29	F	W	Keeps house			Ohio
____ Sarah	9	F	W	Attends school			Ohio

4.  1880 Census Images (online at Ancestry.com, Image #27 of 47):  Pleasant Twp., Fairfield Co., OH, p. 232C, PN 29, SD 5, ED 206, enumerated 23 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
253	255	Cupp Aaron	W	M	44			/	Sawyer	OH	VA	OH
		____ Susan	W	F	39	Wife		/	Keeping House	OH	Ger	OH
		____ Sarah	W	F	19	Dau	/			OH	OH	OH