In the 1880 US Census for District 42, San Francisco, San Francisco County, California a Thomas Barnum who may be this person was enumerated with the family of Sarah J. Barry, as follows:
Dwelling #42; Family #126
Barnum, Thomas; W; M; 14; Boarder; Apprentice bookbinder; b. New York; Father b. New York; Mother b. Ireland
Washington State and Territorial Censuses, 1857-1892 about T. L. Barnum. Name: T. L. Barnum; Census Date: 8 Jul 1889; Residence County: King; Residence State: Washington; Locality: Seattle Ward 2; Birth Location: New York; Marital Status: Single; Gender: Male; Estimated Birth Year: abt 1865; Race: White; Line: 9; Roll: V228_6.
The 1890 US Census was destroyed by fire and Thomas has not been found in the 1900 census.
In the 1910 US Census for District 203, Seattle Ward 12, King County, Washington the family of Thomas L. Barnum was enumerated as follows:
9817 55th Street
Dwelling #171; Family #172
Barnum, Thomas L.; Head; M; W; 44; 1st marriage; married 20 years; b. New York; Parents b. unknown; Speaks English; Printer; Newspaper; Wage earner; Employed full year; Can read and write; Owns non-farm home with mortgage
Barnum, Lydia; Wife; F; W; 41; 1st marriage; Married 20 years; Mother of 4 children; 3 children living; b. California; Father b. New Jersey; Mother b. Maine; Speaks English; No Occupation; Can read and write
Barnum, Gertrude; Daughter; F; W; 18; Single; b. Washington; Father b. New York; Mother b. California; Speaks English; No occupation; Can read and write; Attended school within the census year
Barnum, Robert H.; Son; M; W; 19; Single; b. Washington; Father b. New York; Mother b. California; Speaks English; Helper; Mailing Department News Office; Wage earner; Employed full year; Can read and write; Attended school within the census year
Barnum, Lyndon; Son; M; W; 13; Single; b. Washington; Father b. New York; Mother b. California; Speaks English; No occupation; Can read and write; Attended school within the census year
In the 1920 US Census for District 67, Seattle, King County, Washington the family of Thomas L. Barnum was enumerated as follows:
Dwelling #66; Family #68
Barnum, Thomas L.; Head; Owns home with mortgage; M; W; 54; Married; Can read and write English; b. New York; b. New York - mother tongue English; Father b. Connecticut - Mother tongue English; Mother b. b. Wisconsin - Mother tongue English; Can speak English; Printer for (Seattle) Post Intelligencer
Barnum, Lydia A.; Wife; F; W; 51; Married; Can read and write English; b. California - Mother tongue English; Father b. New Jersey - Mother tongue English; Mother b. Maine - Mother tongue English; Can speak English; No occupation