Extract from the 1850 Census:
Name: William Stevens
Age in 1850: 14
Estimated birth year: 1836
Birthplace: New York [sic]
Race: white
Gender: male
Home in 1850: North Brookfield, Worcester, Massachusetts
Occupation: not listed
Siblings living at home: Lucinda (age 26) and Clarinda (20)
Census place: North Brookfield, Worcester, Massachusetts; Roll: M432_343; Page: 21; Image: 46North Brookfield, Worcester, Massachusetts; Roll: M432_343; Page: 21; Image: 46
Date: 9 Sep 1850

Extract from the 1860 Census:
Name: William X Stevens
Age in 1860: 24
Estimated birth year: 1836
Birthplace: Massachusetts
Race: white
Sex: male
Relation to head-of-house: son
Parent: Selinda (Slayton) Stevens, age 59
Home in 1860: Brookfield, Worcester, Massachusetts
Post office: Brookfield
Mother's birthplace: Massachusetts
Occupation: engineer
Siblings living at home: Lucinda A (age 36) and Clarinda W (30)
Census place: Brookfield, Worcester, Massachusetts; Roll M653_530; Page: 680; Image: 207; Family History Library Film: 803530
Date: 12 Jun 1860

Extract from the 1870 Census:
Name: William X Stevens
Age in 1870: 34
Estimated birth year: 1836
Birthplace: Massachusetts
Race: white
Sex: male
Relation to head-of-house: son
Parent: Selinda (Slayton) Stevens, age 69
Home in 1870: Brookfield, Worcester, Massachusetts
Post office: East Brookfield
Mother's birthplace: Massachusetts
Occupation: machinist inventor
Sibling living at home: Clarinda (age 40)
Census place: Brookfield, Worcester, Massachusetts; Roll: M593_651; Page: 503; Image: 501
Date: 18 Aug 1870

Extract from the 1880 Census:
Name: W X Stevens
Age: 44
Estimated birth year: 1836
Birthplace: Massachusetts
Race: white
Sex: male
Relationship to head-of-household: father [sic - should be son-in-law]
Living with: J L S Egbert age 61 b. Kentucky (female)
Home in 1880: 6th Ward, Louisville, Jefferson, Kentucky
Address: 453 Third Street
Marital status: married
Father's birthplace: Massachusetts
Mother's birthplace: Massachusetts
Occupation: patent attorney
Census place: Louisville, Jefferson, Kentucky; Roll: T9_423; Family History Film: 1254423; Page: 418.3000; Enumeration District: 125; Image: 0337
Date: 4 Jun 1880

Extract from the 1890 Washington, D.C. City Directory:
Name: William X Stevens
Location 1: 705 G Northwest
Location 2: 202 11th Southwest
Occupation: patents
City: District of Columbia

Extract from the 1900 Census:
Name: William X Stevens
Age at last birthday: 64
Date of birth: Dec 1835
Birthplace: Massachusetts
Race: white
Sex: male
Relationship to head-of-house: head
Home in 1900: Washington, District of Columbia
Address: 202 11th Street SW
Marital status: widower
Able to read, write and speak English: yes
Father's birthplace: Massachusetts
Mother's birthplace: Massachusetts
Farm or home: home
Home owned or rented: owned
Mortgage: yes
Occupation: patent attorney
Months not employed: 0
Census place: Washington, District of Columbia; Roll: T623 161; Page: 3B; Enumeration District: 84
Date: 2 Jun 1900

Extract from Sons of the American Revolution Membership Applications, 1889-1970:
Ancestor's name: Jeduthan Stevens
Service: private, Massachusetts Line
Birth date: 22 Jun 1766
Birth place: North Brookfield, Massachusetts
Death date: 28 Sep 1844
Death place: East Brookfield, Massachusetts
Applicant: William Stevens
Birth date of applicant: 21 Dec 1835
Birth place of applicant: East Brookfield, Worcester, Massachusetts
Father: Perley Stevens
Mother: Selinda Slayton
Wife of applicant:
Military service of applicant: He was a soldier in the Revolutionary War and in the War of Shay's Rebellion and a Lieutenant of Militia, as recorded in the published history of the Town of North Brookfield, which was compiled by the Hon. Charles Adams, the Hon. Freman Walker and other distinguished residents of that town. Further than this I can only add that in my boyhood I frequently heard it stated that he enlisted when he was only 15 years old and served to the end of the war; about three years.
The first dated incident in the said history of my ancestors, is the birth on November 2, 1639, in the town of Salisbury, Mass., of John Stevens, son of John Stevens 1st and the town history gives a very complete record, with some history of the family from that time down to the date of my marriage Aug 22 1870. I have a son, Perley Egbert Stevens, who is a civil engineer in St. Paul, Minn., and a daughter, Hellouise Waller, and a granddaughter, Dorothy Waller.
Date of application: 26 Nov 1903
SAR membership: 16417

Extract from the 1910 Census:
Name: William X Stevens
Age in 1910: 74
Estimated birth year: 1836
Birthplace: Massachusetts
Race: white
Sex: male
Relationship to head of family: head
Home in 1910: Precinct 4, Washington, District of Columbia
Address: 202 11th Street SW
Marital status: widower
Able to speak English: yes
Able to read and write: yes
Father's birthplace: Massachusetts
Mother's birthplace: Massachusetts
Farm or house: house
Home owned or rented: owned; no mortgage
Occupation: patent attorney
Industry: inventor
Salary or wage worker: working on own account
Census place: Precinct 4, Washington, District of Columbia; Roll: T624_151; Page: 7A; Enumeration District: 59; Image: 55
Date: 19 Apr 1910

Extract from "Slayton History and Genealogy, 1682-1898" by Asa Walker Slayton:
page 67 88.
William X, b. 21 Dec 1835, in Brookfield; m. Sally Egbert of Ky. 27 Aug 1870. He is a natural mechanic and inventor; was Chief Examiner in the Patent Office for a time, is now Solicitor for Patents and living in Washington. To his memory, and his skill with the pencil, are we chiefly indebted for the fine view of the Old Home on p. 84.

Obituary from the "Post" of Pasadena, California dated 14 Jan 1924:
Former Patent
Attorney Dies;
Sick Two Years
Alhambra, Jan. 14. - William X. Stevens, who had practiced as a patent attorney in Washington, D.C., for many years, passed away Sunday at the home of his daughter, Mrs. Nellouise Leach, Acacia street, East San Gabriel, aged 88 years. He had been in failing health for the past two years.
Funeral services were held this afternoon at 2 o'clock from the parlors of Turner, Stevens and Turner. The interment was private.
Besides Mrs. Leach, Mr. Stevens is survived by one son, Perley Egbert Stevens of St. Paul. His wife died in 1895.
He was born in East Brookfield, Mass. Ten years of his early life were spent in Kentucky after which he took up his home in Washington, where he was a patent attorney until he retired several years ago. He had lived in East San Gabriel for the past four years.

He married Sarah Elizabeth Egbert 22 Aug 1870 in Brookfield, Worcester, Massachusetts.