Might be him, just because it's 1900 Evanston, IL?
Source: "United States Census, 1900," database with images, FamilySearch (
https://familysearch.org/ark:/61903/1:1:MS7X-MKF : accessed 16 May 2021), Otto Swanson, Evanston Township Evanston city Ward 3, Cook, Illinois, United States; citing enumeration district (ED) 1157, sheet 26A, family 366, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,292. IMAGE:
https://www.familysearch.org/ark:/61903/3:1:S3HY-6QN7-6P5?cc=1325221&personaUrl=%2Fark%3A%2F61903%2F1%3A1%3AMS7X-MKF
United States Census, 1900 Evanston Township Evanston city Ward 3, Cook, Illinois Immig 1899 (Illinois Industrial School for Girls)
: Otto Swanson Single White Male Age 27 Birth Feb. 1873 Sweden Servant /Gardner
''? '' Source: "Illinois, Northern District Naturalization Index, 1840-1950," database with images, FamilySearch (
https://familysearch.org/ark:/61903/1:1:XKP9-3S2 : 2 March 2021), Otto Robert Swanson, 1904; citing Illinois, NARA microfilm publication M1285 (Washington D.C.: National Archives and Records Administration, n.d.), roll 161; FHL microfilm 1,432,161. IMAGE:
Illinois, Northern District Naturalization Index
: Otto Robert Swanson
: Residence 160 Sheridan Rd. Evanston, IL
: Birth March 2 1873 Sweden
: Naturalization Aug 22, 1904
: Immigration May 5, 1896, NY
: Witnesses Oscar Johnson; B. B Noyes
''?''
https://www.familysearch.org/ark:/61903/3:1:33S7-91WL-2BT?cc=1968530&personaUrl=%2Fark%3A%2F61903%2F1%3A1%3AK68C-JRT
United States World War I Draft Registration Cards, 1917-1918
: Otto Robert Swanson Birth 2 Mar 1873 Houseman/Gardner
: Mrs Anna Swanson
''?'' "Illinois, Cook County Deaths, 1871-1998," database, FamilySearch (
https://familysearch.org/ark:/61903/1:1:QLYT-CQK1 : 17 March 2018), Otto Robert Swanson, 06 Mar 1926; citing Chicago, Cook, Illinois, United States, source reference , record number , Cook County Courthouse, Chicago; FHL microfilm .
: Otto Robert Swanson
: Male Age 53
: Residence Place 975 East 60th St. Chicago, Cook, Illinois
: Burial Date 08 Mar 1926 Oak Hill
: Death Date 06 Mar 1926, Chicago, Cook, Illinois, United States
: Birth Date 02 Mar 1873 Angernus, Sweden
: White Male Married/ Occupation Janitor
: Father Mathias Swanson
: Spouse/Informant Anna Swanson
: Funeral Home Charles J Dohlgrew
'' ?'' "Illinois, Cook County Marriages, 1871-1968", database, FamilySearch (
https://familysearch.org/ark:/61903/1:1:N7ZN-Z5X : 10 March 2018), Otto R. Swanson and Anna S. Saell, 11 Feb 1916.
:Otto R. Swanson
: Residence Place Cook, Illinois, United States
: Age 42y Birth (est) 1874
: SpouseAnna S. Saell
: Age 48 Birth est 1868
: License /Marriage 11 Feb 1916 Chicago, Cook, Illinois