In the 1910 US Census for Enumeration District 141, Crooked Creek Precinct, Lake County, Oregon, Charles was enumerated as follows:
Dwelling 26; Family 26
Barnum, Chas. L., Head, 28, b. California, Father b. Missouri, Mother b. Iowa, Laborer, Sheepherder.
Note: The dwelling and family number were later crossed out, leaving the impression that Charles was living in the home of S. P. Dickie (Dwelling 25; Family 25), where his older brother Alfred was enumerated as follows:
Barnum, Al. H., Employee, 36, Single, b. California, Father b. Missouri, Mother b. Iowa, Laborer, Farm
In the 1920 US Census for Enumeration District 131, Oak Bar Township and Precinct, Siskiyou County, California, Charles was enumerated together with his brothers Alfred and Ira, as follows:
Dwelling 125; Family 125
Sambo Gulch Trail
Barnum, Alfred, Head, Owns free of mortgage, Male, White, Age 45, Single, Able to read and write, b. California, Father b. Missouri, Mother b. Iowa, Miner, Copper mine
Barnum, Ira, Brother, Male, White, Age 43, Single, b. California, Father b. Missouri, Mother b. Iowa, Miner, Copper mine
Barnum, Charles, Brother, Age 38, Single, b. California, Father b. Missouri, Mother b. Iowa, Miner, Copper mine
Lane, Lafayette, Partner, Male, White, 61, Divorced, Miner, Copper mine.
In the 1930 US Census for Enumeration District 47-36, Yreka Township (part), Siskiyou County, California, the family of Charles Barnum was enumerated as follows:
Dwelling #137; Family #139
Klamath River Highway (US 99)
Barnham (sic), Chas. L., Head, Rents non-farm residence for $5 per month, Male, White, 48, Married, Age 47 at first marriage, Did not attend school during the census year, able to read and write, b. Oregon, Father and mother b. Indiana, Able to speak English, Carpenter, House, Non-veteran
Barnham, Lucretia, Wife, Female, White, Age 54, Married, Age 53 at first marriage, Did not attend school during the census year, able to read and write, b. Oregon, Father b. Tennessee, Mother b. West Virginia, Able to speak English, No trade or occupation
Luffman, Jas. E., Head, Male, White, 25, Married, Age 21 at first marriage, Did not attend school during the census year, able to read and write, b. Tennessee, Father and mother b. Tennessee, Able to speak English, Laborer, Highway construction, Non-veteran
Luffman, Beaulah, Wife, Female, White, Age 20, Married, Age 16 at first marriage, Did not attend school during the census year, able to read and write, b. Idaho, Father b. Oregon, Mother b. Kansas, Able to speak English, No trade or occupation
Luffman, Bernadean, Daughter, Female, White, Age 2-10/12, Single, Did not attend school during the census year, able to read and write, b. Idaho, Father b. Tennessee, Mother b. Idaho, Not able to speak English, No trade or occupation
Birth location based upon 1942 World War II, Draft Registration Card. That same registration card and the Social Security Death Index show his date of birth as May 8, 1881.