John was living in Grant Co, OK in the 1910 census. In the 1920 census, his wife was widowed. He died between 1910 & 1920.

1870 census:
Name: John W Bowman
Age in 1870: 9
Birth Year: abt 1861
Birthplace: Missouri
Dwelling Number: 131
Home in 1870: Salem, Daviess, Missouri
Race: White
Gender: Male
Post Office: Gallatin
Attended School: Y
Inferred Father: Henry Bowman
Inferred Mother: Lucy Bowman
Household Members:
Name Age
Henry Bowman 38
Lucy Bowman 34
Dennis Bowman 13
Esther J Bowman 10
John W Bowman 9
Sarah S Bowman 6
Mary E Bowman 4
Martha A Bowman 2

1880 census:
Name: John W. Bowman
Age: 18
Birth Date: Abt 1862
Birthplace: Missouri
Home in 1880: Salem, Daviess, Missouri, USA
Dwelling Number: 49
Race: White
Gender: Male
Relation to Head of House: Son
Marital status: Single
Father's name: Henry Bowman
Father's Birthplace: Indiana
Mother's name: Lucy Bowman
Mother's Birthplace: Indiana
Occupation: Works On Farm
Neighbors: View others on page
Household Members:
Name Age
Henry Bowman 48
Lucy Bowman 44
Dennis Bowman 23
Esther J. Bowman 20
John W. Bowman 18
Sarah C. Bowman 17
Mary E. Bowman 14
Martha Bowman 12
Charles Guiliams 7

1883 marriage:
From Missouri, Marriage Records, 1805-2002:
Name: Mr John W Bowman
Age: 21
Birth Date: abt 1862
Marriage Date: 4 Feb 1883
Marriage Place: Daviess, Missouri, USA
Spouse: Viola May Pate

1900 census:
Name: John W Bowman
Age: 38
Birth Date: Jun 1861
Birthplace: Missouri
Home in 1900: Rock Island, Grant, Oklahoma
Sheet Number: 1
Number of Dwelling in Order of Visitation: 2
Family Number: 2
Race: White
Gender: Male
Relation to Head of House: Head
Marital status: Married
Spouse's name: Viola Bowman
Marriage Year: 1883
Father's Birthplace: Indiana
Mother's Birthplace: Indiana
Occupation: Doctor Ostepa
Months Not Employed: 0
Can Read: Yes
Can Write: Yes
Can Speak English: Yes
House Owned or Rented: R
Farm or House: H
Neighbors: View others on page
Household Members:
Name Age
John W Bowman 38
Viola Bowman 37
Clarence M Bowman 16
David Bowman 10
Elmer Bowman 6
Homer Bowman 6

1910 census:
Name: John W Bowman
Age in 1910: 48
Birth Year: abt 1862
Birthplace: Missouri
Home in 1910: Rock Island, Grant, Oklahoma
Race: White
Gender: Male
Relation to Head of House: Head
Marital status: Married
Spouse's name: Viola M Bowman
Father's Birthplace: Indiana
Mother's Birthplace: Indiana
Native Tongue: English
Occupation: Restaurant
Employer, Employee or Other: Own Account
Home Owned or Rented: Rent
Farm or House: House
Able to Read: Yes
Able to Write: Yes
Years Married: 27
Neighbors: View others on page
Household Members:
Name Age
John W Bowman 48
Viola M Bowman 46
Clarance M Bowman 26
David Bowman 20
Elmer Bowman 16
Hamer Bowman 16