"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MQM8-3SM : accessed 5 September 2019), William N Brown, Precinct 3, 5, 6, 24 Montana, Platte, Bradford, Lamb, Jefferson, Colorado, United States; citing enumeration district (ED) 216, sheet 12B, family 213, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,124.
It may be possible to confirm family relationships with William by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with William: