James appears to have been enumerated twice in 1880.
Sources
1860 Census: "1860 United States Federal Census" The National Archives in Washington D.C.; Record Group: Records of the Bureau of the Census; Record Group Number: 29; Series Number: M653; Residence Date: 1860; Home in 1860: Bristol, Bristol, Rhode Island; Roll: M653_1202; Page: 71; Family History Library Film: 805202 Ancestry Sharing Link - Ancestry Record 7667 #34810367 James Sannes (8) in Bristol, Bristol, Rhode Island. Born in Rhode Island.
1870 Census: "1870 United States Federal Census" Year: 1870; Census Place: Bristol, Bristol, Rhode Island; Roll: M593_1471; Page: 56A Ancestry Record 7163 #11570833 James A Tanner (18), Hostler, in Bristol, Bristol, Rhode Island. Born in Rhode Island.
1880 Census: "1880 United States Federal Census" Year: 1880; Census Place: Bristol, Bristol, Rhode Island; Roll: 1209; Page: 56d; Enumeration District: 067 Ancestry Record 6742 #24118058 James Tanner (28), single son, Hosier, in household of Daniel H. Tanner (57) in Bristol, Bristol, Rhode Island, USA. Born in Rhode Island.
1880 Census: "1880 United States Federal Census" Year: 1880; Census Place: Bristol, Bristol, Rhode Island; Roll: 1209; Page: 15b; Enumeration District: 066 Ancestry Record 6742 #44441698 James Tanner (28), married, Laborer, head of household in Bristol, Bristol, Rhode Island, USA. Born in Rhode Island.
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