JD
John Davidson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Onondaga-County, New York
Our Model Tree links this John Davidson across the 1920, 1930 and 1940 US Censuses in Onondaga-County, New York (XGBoost, ~Confirmed), with identified parents John & Helen — first a head (b.~1900), then head of a 4-person household.
Age 40
b. ~1900
Male
Head
Born: New York
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Onondaga-County, New York |
| Surname | Davidson |
| Given Name | John T. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | New York |
| 1935 Residence (City) | Syracuse |
| 1935 Residence (County) | Onondaga |
| Additional Details | |
| Occupation | Bldg. Superint. |
| Industry | Apartment House |
| Class of Worker | PW |
| Hours Worked | 64 |
| Income (1939) | 1436 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Bldg. Superint. |
| Township / Ward | Syracuse |
| Est. Birth Year | ~1900 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Joan Davidson | Daughter | — | 6 | ~1934 |
| John Davidson | Head | — | 40 | ~1900 |
| Winnie Davidson | Spouse | — | 32 | ~1908 |
| Virginia Tomlinson | Spouse | — | 24 | ~1916 |
Census Appearances
1920
Onondaga, New …
Son, age 20
Onondaga, New York · implied b. ~1900 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Davidson |
| Given Name | John T. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Plumber |
| Industry | Iron Shop |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Onondaga, New …
Son, age 30
Onondaga, New York · implied b. ~1900 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Davidson |
| Given Name | John J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | New York |
| Age at First Marriage | 21 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Plumber |
| Industry | Plumbing Business |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Onondaga-County, New …
Head, age 40
Onondaga-County, New York · implied b. ~1900 — 4 household members
| Surname | Davidson |
| Given Name | John T. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | New York |
| 1935 Residence (City) | Syracuse |
| 1935 Residence (County) | Onondaga |
| Occupation | Bldg. Superint. |
| Industry | Apartment House |
| Class of Worker | PW |
| Hours Worked | 64 |
| Income (1939) | 1436 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links John Davidson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Davidson (~0.92 confidence) and mother Helen Davidson (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Davidson
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Helen Davidson
b. ~1875
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Davidson
Head · 1940 · age 40 · b. ~1900 · New York
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Onondaga-County, New York
Open full size
1940 US Federal Census — Onondaga-County, New York
Page Contents
37 people indexed on this census page (nara:1940:m-t0627-02854-00493)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Irene F. Ayton | 26 | Wife | — | New York |
| 42 | Patricia A. Ayton | 5 | daughter | — | New York |
| 43 | John C. Boakman | 37 | Head | Metal Worker | New York |
| 44 | Mary H. Boakman | 38 | Wife | — | New York |
| 45 | Thomas M. Wolfson | 34 | Head | Instrument Man | Pennsylvania |
| 46 | Christine S. Wolfson | 28 | Wife | — | Canada-Eng |
| 47 | Thomas R. Wolfson | 3 | Son | — | New York |
| 48 | Jean Ann Wolfson | 1 | daughter | — | New York |
| 49 | Frank D. Schug | 65 | Head | Office Clerk | New York |
| 50 | Agnes R. Schug | 33 | Wife | — | New York |
| 51 | Nancy Schug | 8 | daughter | — | New York |
| 52 | Benjamin F. Jones | 57 | Head | Trainman | Pennsylvania |
| 53 | Anna M. Jones | 40 | Wife | — | New York |
| 54 | Betty A. Jones | 13 | daughter | — | New York |
| 55 | Julia Whitzer | 31 | sister-law | Welder | New York |
| 56 | John T. Davidson THIS PERSON | 40 | Head | Bldg. Superint. | New York |
| 57 | Winnie H. Davidson | 32 | Wife | — | New York |
| 58 | Joan D. Davidson | 6 | daughter | — | New York |
| 59 | Virginia Tomlinson | 24 | Wife | — | Pennsylvania |
| 60 | Raymond H. Gillis | 28 | Head | Manager | New York |
| 61 | Selma M. Gillis | 32 | Wife | Ibm Machine Operator | New York |
| 62 | Addison P. French | 61 | Head | Civil Engineer | New York |
| 63 | Florence I. French | 52 | Wife | — | New York |
| 64 | Mabel Milbyer | 57 | Head | Saleslady | New York |
| 65 | Jane L. Kurtz | 55 | Sister | Cashier | New York |
| 66 | Emil V. Plecha | 56 | Head | Superintendent | Bohemia |
| 67 | Barbara Plecha | 55 | Wife | — | Bohemia |
| 68 | Nora E. Cagan | 75 | Head | — | New York |
| 69 | Sarah Leahy | 77 | Sister | — | New York |
| 70 | Robert G. Benifiel | 54 | Head | Sport Editor | Massachusetts |
| 71 | Edith H. Benifiel | 52 | Wife | Proprietress | Massachusetts |
| 72 | Edith M. Benifiel | 21 | daughter | — | Massachusetts |
| 73 | Katherine L. Benifiel | 17 | daughter | — | New York |
| 74 | Owen B. Perry | 34 | Head | State Agent | Michigan |
| 75 | Florence S. Perry | 31 | Wife | — | Illinois |
| 76 | James B. Exner | 48 | Head | Engineman | New York |
| 77 | Agnes Exner | 50 | Wife | — | Canada-Eng |
Pedigree Summary
John
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)