James Thomas BROWN was born in Illinois in Jun 1849 according to the 1900 Montana Census. He is also listed in the 1880 Nebraska Census. I can’t find him in 1850, 1860 or1870. He was in Milwaukee in 1868 where he married. Believed to be living in Ontario in 1869, where his first child was born in Kent County.Hi Lance,
The USA 1900 census states that your James' father was born in Canada - Eng. which generally means Ontario (not always, but usually).
Since he was in Ontario in 1869 you may want to you may want to check 1851, 1861 (partially transcribed) and 1871 Canada Census (head of house only indexed online).
See http://allcensusrecords.com/canada/ for help finding these online records.