I found about 171 Barnards in the 1870 Pennsylvania federal census.
1860 United States Federal Census > Pennsylvania > Armstrong > Cowanshannock images 19 and 20
Barnard, G A, age 51, farmer
Barnard, Rosanna, age 45
Barnard, Margaret, age 19
Barnard, Isabella, age 15
Barnard, John, age 10
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