In the 1870 US Census for Manchester, Dallas County, Arkansas the family of John Barnum was enumerated as follows:
Dwelling #50; Family #49
Barnum, John; 30; M; Black; Farm laborer; b. Missouri; Cannot read or write; Male citizen of US of 21 years of age and upwards
Barnum, Amanda; 33; F; Black; Keeping house; b. Alabama; Cannot read or write
Barnum, Carolina; 7; F; Black; b. Arkansas
Barnum, Alexander; 3; M; Black; b. Arkansas