1850 US Census
Shows him 17 years old, living in Mercer, Mercer PA with parents Hugh Evans and Margaret, and 3 sisters, Sarah, Margaret and Martha.
1860 US Census
Shows him as living with sisters Margaret and Sarah, with occupation tavern keeper.
"John B Evans LITTLE Ancestors Birth: dd mm 1833 - Mercer County (Mercer) Pennsylvania, Death Certificates, 1906-1963 BIRTH, MARRIAGE & DEATH View Image NAME: John B Evans BIRTH: date - location DEATH: dd mm 1916 - city, Erie, Pennsylvania, USA
1850 United States Federal Census 1850S View Image Record information. Name John B Evans Birth Pennsylvania Residence 1850 city, Mercer, Pennsylvania, USA AGE: 17 BIRTH YEAR: 1833
1860 United States Federal Census 1860S View Image Record information. Name John B Evans Relative given name surname Birth abt 1833 Pennsylvania Residence 1860 city, Mercer, Pennsylvania, USA AGE: 27 BIRTH YEAR: 1833."
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The 1900 census shows a John B. Evans living in Mill Creek, Erie County (same place as my John Brown Evans lived in 1860), married to Sophia L. Evans (which matches their shared Erie County grave stone). The 1900 census confirms a September 1935 birth date, which matches the Find-A-Grave record.
The location isn't definitive, but I think it points to the husband of Sophia being John Brown Evans and not John Bradley Evans.