In the 1880 US Census for Royal Oak, Oakland County, Michigan the family of Warren Barnum was enumerated as follows:
Dwelling #99; Family #100
Barnum, Warren; White; Male; 43; Head; Single; Railroad laborer; b. New York; Father b. Connecticut; Mother b. New York
Barnum, Phebe D.; White; Female; 65; Mother; Widowed; Housekeeping; b. New York; Both parents b. New York
Barnum, Lucy E.; White; Female; 32; Sister; Single; housekeeping; b. Michigan; Father b. Connecticut; Mother b. New York