— born in Schaefferstown, Lebanon Co., PA:
.  John L. KAPP, b. 11 Oct 1815; d. 16 Nov 1842
.  Michael KAPP, b. 14 May 1819

1.  Marriage Record:

2.  1810

3.  1820 Census Index/Images (online at Ancestry.com; Image #2 of 8; extracted by Diana Gale Matthiesen):

1820

PA

Lebanon Co.

Heidelberg Twp.

p. 147

Ln. 54

John Kapp

210110-22010-0-001

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	9 or under	1810-1820	= Michael (b. 1819) = John (b. 1815)
1 male	10-15	1804-1810	= Son A
1 male	19-25*	1794-1801	= ?
1 male	26-44	1775-1794	= John (b. 1777)
2 females	9 or under	1810-1820	= Daughter A = Sarah (b. 1812)
2 females	10-15	1804-1810	= Susanna (b. 1807) = Elizabeth (b. 1805)
1 female	26-44	1775-1794	= Sarah (b. 1780/1)
1	person engaged in manufacture
*In the 1820 Census, the third column is age class 16-18 and the fourth column is age class 16-25; therefore, any individual in column three is duplicated in column four.  By subtracting the number in column three from the number in column four, you can create an age class "19-25."

4.  1830 Census Index/Images (online at Ancestry.com; Image #31 of 34; extracted by Diana Gale Matthiesen):•

1830

PA

Lebanon Co.

Heidelberg Twp.

p. 126

Ln. 16

Sarah Kopp

010 000 000 - 000 100 010

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	5-9	1820-1825	= Michael? (b. 1819)
1 female	15-19	1810-1815	= Sarah (b. 1812)
1 female	50-59	1770-1780	= Sarah (b. 1780/1)

Where's John?  He's only 15, but I supposed he could be living and working out of the home.  Listed two lines above Benjamin LANDIS (age 40-50), who may be Sarah's brother.

5.  1840 Census Index/Images (online at Ancestry.com; Image #11 of 36; extracted by Diana Gale Matthiesen):¤•

1840

PA

Lebanon Co.

Heidelberg Twp.

p. 75B

Ln. 2

Sarah Kapp

000 000 000 - 000 000 010

_______

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 female	50-59	1780-1790	= Sarah (b. 1780/1)

6.  1850 Census Index/Images (online at Ancestry.com; Image #9 of 14):  Schaefferstown, Lebanon Co., PA, p. 24A, 325/353, enumerated 4 Sep 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen).  For full record, see Michael & Elizabeth STRICKLER's family group sheet.• 

Michael Strickler	38	M		Laborer	300	Pennsylvania
Elizabeth   "	40	F				"
[Michael & Elizabeth's children]
Sarah Kapp	69	F				"

Is Elizabeth Sarah's daughter?  If so, she's fibbing about her age (or we have an incorrect birthdate?).

7.  LDS.  Family Search: Internet Genealogy Service: Pedigree Resource File (index to CDs, online at FamilySearch.org).