JD
John Davidson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Greene-County, Illinois
Our Model Tree links this John Davidson across the 1920, 1930 and 1940 US Censuses in Greene-County, Illinois (XGBoost, ~Confirmed), with identified parents Beatrice & Jesse — first a son (b.~1919), then head of a 4-person household.
Age 21
b. ~1919
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Greene-County, Illinois |
| Surname | Davidson |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Bluffdale |
| 1935 Residence (County) | Greene |
| Additional Details | |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 45 |
| Income (1939) | 888 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Laborer |
| Township / Ward | Bluffdale |
| Est. Birth Year | ~1919 |
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 |
|---|---|---|---|---|
| Letha Davidson | Daughter | — | 16 | ~1924 |
| Jesse Davidson | Head | — | 51 | ~1889 |
| John Davidson | Son | — | 21 | ~1919 |
| Beatrice Davidson | Spouse | — | 37 | ~1903 |
Census Appearances
1920
Greene, Illinois
Son, age 2
Greene, Illinois · implied b. ~1918 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Davidson |
| Given Name | John Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Greene, Illinois
Son, age 12
Greene, Illinois · implied b. ~1918 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Davidson |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Greene-County, Illinois
Son, age 21
Greene-County, Illinois · implied b. ~1919 — 4 household members
| Surname | Davidson |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Bluffdale |
| 1935 Residence (County) | Greene |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 45 |
| Income (1939) | 888 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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: mother Beatrice Davidson (~0.92 confidence) and father Jesse Davidson (~0.92 confidence) and mother Beatrice Davidson (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Beatrice Davidson
b. ~1889
Source mother
● Household
· direct · ~0.92
Father
Jesse Davidson
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Beatrice Davidson
b. ~1903
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Davidson
Son · 1940 · age 21 · b. ~1919 · Illinois
★ You are viewing this record
Sibling
Letha Davidson
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Greene-County, Illinois
Open full size
1940 US Federal Census — Greene-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00808-00037)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mary Best | 10 | Daughter | — | Illinois |
| 42 | Martha Best | 7 | Daughter | — | Illinois |
| 43 | Ethel Chupp | 45 | Laborer | Housekeeper | Illinois |
| 44 | Lowell Plogge | 28 | Head | Laborer | Illinois |
| 45 | Helen Plogge | 27 | Wife | Housewife | Illinois |
| 46 | Eugene Plogge | 5 | Son | — | Illinois |
| 47 | Mary Plogge | 3 | Daughter | — | Illinois |
| 48 | Phillis Plogge | 1 | Daughter | — | Illinois |
| 49 | Charles Bacon | 72 | Father-in-law | Laborer | Illinois |
| 50 | Jacob Hufford | 32 | Head | Laborer | Illinois |
| 51 | Eva Hufford | 30 | Wife | Housewife | Illinois |
| 52 | Harold Hufford | 4 | Son | — | Illinois |
| 53 | Ronald Hufford | 2 | Son | — | Illinois |
| 54 | Robert Watters | 40 | Head | Laborer | Missouri |
| 55 | Edna Watters | 38 | Wife | Housewife | Illinois |
| 56 | Orville Watters | 19 | Son | Laborer | Illinois |
| 57 | Betty Watters | 12 | Daughter | — | Illinois |
| 58 | Clifford Watters | 9 | Son | — | Illinois |
| 59 | Marjorie Watters | 3 | Daughter | — | Illinois |
| 60 | Carroll Watters | 2 | Son | — | Illinois |
| 61 | Edward Whitlock | 33 | Head | Laborer | Illinois |
| 62 | Francis Whitlock | 34 | Wife | Housewife | Illinois |
| 63 | Mary Whitlock | 3 | Daughter | — | Illinois |
| 64 | Albert Wagoner | 37 | Head | Laborer | Illinois |
| 65 | Irene Wagoner | 31 | Wife | Housewife | Illinois |
| 66 | Russell Wagoner | 7 | Son | — | Illinois |
| 67 | Earl Spittler | 30 | Head | Laborer | Illinois |
| 68 | Helen Spittler | 29 | Wife | Housewife | Illinois |
| 69 | Frances Spittler | 8 | Son | — | Illinois |
| 70 | Harold Handeling | 19 | Head | Laborer | Illinois |
| 71 | Fannie Handeling | 49 | Mother | Housekeeper | Illinois |
| 72 | Kendall Handeling | 13 | Son | — | Illinois |
| 73 | Wanda Handeling | 13 | Daughter | — | Illinois |
| 74 | Daniel Handeling | 9 | Son | — | Illinois |
| 75 | Lee Whitaker | 25 | Head | Laborer | Illinois |
| 76 | Helen Whitaker | 25 | Wife | Housewife | Illinois |
| 77 | Jesse Davidson | 51 | Head | Farmer | Illinois |
| 78 | Beatrice Davidson | 37 | Wife | Housewife | Illinois |
| 79 | John Davidson THIS PERSON | 21 | Son | Laborer | Illinois |
| 80 | Letha Davidson | 16 | Daughter | — | Illinois |
Pedigree Summary
John + 1 sibling
Gen 1 · 3 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)