Notes:
This information about Jacob's birth and death are from the records of Shoops Cemetery, Lower Paxton Twp., Dauphin Co., PA and confirmed from his tombstone picture
1820 Census PA, Dauphin Co., Susquehanna Twp.
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Mumma, David
males < 10 - 1 <== David Jr. age 4
males 10-16 - 1 <== Jacob age 9
males 16-18 - 1 <== John age 17 [this was a lucky age bracket]
males 45 & over - 1 <== David age 42 [close - maybe his birth date is incorrect]
females < 10 - 1 <== unknown female
females 10-16 - 2 <== unknown females (Susan, 12, who married Samuel Hassler)
females 16-26 - 2 <== Elizabeth who married John Fackler, age 21 + unknown female]
females 26-45 - 1 <== Esther age 46
1 person engaged in agriculture
1830 Census, PA, Dauphin Co., Susquehanna Twp.
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Mumma, David
males 10-15 - 1 <== David Jr. age 14
males 20-30 - 2 <== John age 27 and Jacob 19
males 50-60 - 1 <== David, age 52
females 15-20 - 1 <== unknown female from previous census
females 20-30 - 1 <== unknown female from previous census (Elizabeth & Susan are married)
females 50-60 - 1 <== Esther, age 56