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Birth date from a family Bible.

On 24 January 1900, Robert L. Donaldson and Annie his wife purchased a house at 2705 Eastern Avenue in Baltimore City, Maryland. [Baltimore City, Maryland, Land Records, R.O. No. 1747, Folio 417, Liber S.C.L. Block 1790.]

On 12 April 1902, The Baltimore Sun posted:
Celebrates Twelfth Anniversary.
The members of the Patterson Lodge, No. 39, Shield of Honor, celebrated the twelfth anniversary of its organization with a banquet last night at Lewis’ Hall, Ann and Jefferson streets. Covers were laid for 100. The decorations were suggestive of patriotism. John W. Meeks, supreme treasurer; James J. McNamara, grand chaplain, and William F. Edwards, junior supreme master, responded to toasts. The banquet committee consisted of Gustav G. Siegel, chairman; Edward Giudice, secretary; Wellington S. Dawson, treasurer; Henry O. Kommalan, Wm. T. Kopp, James G. Dobson, Robert L. Donaldson.
[The Baltimore Sun, 12 April 1902, page 12.]

On 7 December 1905, The Baltimore Sun published a list of Permits to Build issued on 6 December 1905, including:
R. L. Donaldson—To erect dryer at 2705 Eastern avenue.
[The Baltimore Sun, 7 December 1905, page 9.]

1910 U.S. Census, Baltimore City, Maryland:
Enumeration District 8, Ward 1, page 2B
2705 Eastern Avenue, Dwelling No. 30, Family No. 35
Donaldson, Robert C [sic], head, male, white, age 46, married twice, number of years of present marriage: 7, born in Maryland, both parents born in Maryland, speaks English, occupation traveling salesman, merchant tailor, wage earner, not out of work in 1909 or 1910, can read and write, owns house free of mortgage
Donaldson, Minnie, wife, female, white, age 48, married once [sic], number of years of present marriage: 7, mother of 10 children, 7 children living, born in Maryland, both parents born in Germany, speaks English, no occupation, can read and write
Kopp, Charles, step son, male, white, age 24, single, born in Maryland, both parents born in Maryland, speaks English, no occupation, can read and write, in school since 1 September 1909
Kopp, Julia, step daughter, female, white, age 15, single, born in Maryland, both parents born in Maryland, speaks English, no occupation, can read and write, in school since 1 September 1909
Kopp, John, step son, male, white, age 13, single, born in Maryland, both parents born in Maryland, speaks English, no occupation, can read and write, in school since 1 September 1909
Kopp, Frank, step son, male, white, age 10, single, born in Maryland, both parents born in Maryland, speaks English, no occupation, can read and write, in school since 1 September 1909
Donaldson, Cecilia, daughter, female, white, age 6, single, born in Maryland, both parents born in Maryland, no occupation

1920 U.S. Census for Baltimore City, Maryland:
E.D. 9, Sheet 1, enumerated on 2 January 1920
Dwelling No. 17, Family No. 19
2705 Eastern Avenue
Donaldson, Robert L., head, owned, 55, born in Maryland, both parents born in Scotland, clerk at railroad, wage worker
Donaldson, Minnie, wife, 58, born in Maryland, born parents born in Germany, no trade
Donaldson, Martha C., daughter, 15, born in Maryland, no trade
Kopp, Frank C., step-son, 19, born in Maryland, electrician in chemical mfg., wage worker

1930 U.S. Census, Baltimore City, Maryland
First Ward, Block 63, Enumeration District 4-16, Supervisor’s District 4, Sheet 1A
Enumerated on 2 April 1930
2705 Eastern Avenue
Dwelling 3, Household 4
Donaldson, Robert L., head, owner, $5,200 in real value, no radio set, not on farm, male, white, age 65, married (no age stated for first marriage), not in school, can read and write, born in Maryland, both parents born in Germany, speaks English, occupation railway-clerk for railroad, wage worker, at work previous day, not a veteran
Donaldson, Minnie, wife, female, white, age 67, married (no age stated for first marriage), not in school, can read and write, born in Maryland, both parents born in Germany, speaks English, no occupation
Household 5
Korte, George F., head, renting for $20, no radio set, not on farm, male, white, age 32, married, first married at age 22, not in school, can read and write, born in Maryland, both parents born in Maryland, speaks English, occupation book-keeper for advertising company, wage worker, at work previous day, not a veteran
Korte, Cecilia M., wife, female, white, age 26, married, first married at age 16, not in school, can read and write, born in Maryland, both parents born in Maryland, speaks English, no occupation
Korte, Muriel M., daughter, female, white, age 6, single, in school, (read and write is blank), born in Maryland, both parents born in Maryland, (speaks English is blank), no occupation

On 31 October 1957, Robert Louis Donaldson died at his residence, 2705 Eastern Avenue, Baltimore, Maryland. He was male, white, married, husband of Wilhelmina K. Donaldson. Born 9 October 1864, died aged 73 years, 22 days. Occupation clerk, railroad, until “about 4 years ago”. Born in Oxford, Maryland. Father was C. Donaldson, born in Oxford, Maryland; mother was Martha Lees, born in Oxford, Maryland. Buried at Loudon Park Cemetery on 3 November 1937. Primary cause of death was valvular heart disease, 2 years. Contributing cause illegible. [Baltimore City, Maryland, Certificate of Death F-40567.]

A death notice in The Baltimore Sun stated:
DONALDSON.—Suddenly, on October 31, 1937, ROBERT L., SR., fell asleep in Jesus, beloved husband of Wilhelmina Strahlein (nee Kopp). [Eastern Shore (Md.) papers please copy.] ¶Funeral from his home, 2705 Eastern avenue, on Wednesday at 2 P. M. Friends and relatives are invited to attend the services at Calvary Methodist Protestant Church. East avenue and Fleet street, at 2.30 P. M. Interment in Loudon Park Cemetery.