RD
Robert Davidson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Bay-County, Michigan
Our Model Tree links this Robert Davidson across the 1930 and 1940 US Censuses in Bay-County, Michigan (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 10-person household.
Age 11
b. ~1929
Male
Son
Born: Michigan
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Bay-County, Michigan |
| Surname | Davidson |
| Given Name | Robert |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Michigan |
| 1935 Residence (City) | Bay City |
| 1935 Residence (County) | Bay |
| Additional Details | |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Township / Ward | Bay City |
| Est. Birth Year | ~1929 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| John Davidson | Head | — | 40 | ~1900 |
| Mary Davidson | Daughter | — | 4 | ~1936 |
| Delores Davidson | Daughter | — | 9 | ~1931 |
| Gertrude Davidson | Daughter | — | 8 | ~1932 |
| Dorothy Davidson | Daughter | — | 5 | ~1935 |
| Julien Davidson | Daughter | — | 2 | ~1938 |
| Robert Davidson | Son | — | 11 | ~1929 |
| John Davidson | Son | — | 14 | ~1926 |
| Richard Davidson | Son | — | 12 | ~1928 |
| Pearl Davidson | Spouse | — | 36 | ~1904 |
Census Appearances
1930
Bay, Michigan
Other, age 2
Bay, Michigan · implied b. ~1928 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Davidson |
| Given Name | Robert |
| Relationship to Head | Grandson |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1940
Bay-County, Michigan
Son, age 11
Bay-County, Michigan · implied b. ~1929 — 10 household members
| Surname | Davidson |
| Given Name | Robert |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Michigan |
| 1935 Residence (City) | Bay City |
| 1935 Residence (County) | Bay |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
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 Robert Davidson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Davidson
Son · 1940 · age 11 · b. ~1929 · Michigan
★ You are viewing this record
Sibling
Richard Davidson
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Davidson
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Davidson
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Delores Davidson
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Davidson
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gertrude Davidson
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Julien Davidson
Sibling · 1940 · age 2
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 — Bay-County, Michigan
Open full size
1940 US Federal Census — Bay-County, Michigan
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01727-00563)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Charles Lee Bywaters | 12 | son | — | Ohio |
| 2 | George Lorenz | 40 | head | Moulder | Ohio |
| 3 | Augusta Lorenz | 40 | wife | Assembler | Ohio |
| 4 | Albert Cardiell | 13 | stepson | — | Ohio |
| 5 | Joseph Bush | 57 | head | Metal Worker | Michigan |
| 6 | Josephine Bush | 59 | wife | — | Ontario |
| 7 | — | None | — | — | — |
| 8 | Mollie Derych | 75 | head | — | Michigan |
| 9 | Lilian O'Konner | 29 | head | Drill Press | Michigan |
| 10 | Marilyn O'Konner | 9 | daughter | — | Michigan |
| 11 | Evelyn Hiedley | 22 | sister | Laborer | Michigan |
| 12 | Margaret Betzloff | 51 | head | — | Michigan |
| 13 | Charles Prynecke | 62 | brother | Checker | Germany |
| 14 | Adolph Streeck | 54 | head | Mail Carrier | Michigan |
| 15 | Sophia Streeck | 49 | wife | — | Michigan |
| 16 | Doris Streeck | 23 | daughter | Stenographer | Michigan |
| 17 | Adolph Streeck | 20 | son | Errant Boy | Michigan |
| 18 | Carolyn Dargz | 79 | niece | — | Germany |
| 19 | John Kandziorski | 49 | head | Press | Michigan |
| 20 | Mabel Kandziorski | 45 | wife | — | Michigan |
| 21 | Leona Kandziorski | 24 | daughter | Housework | Michigan |
| 22 | Florian Kandziorski | 14 | son | — | Michigan |
| 23 | Elmer Kunkel | 35 | head | Owner | Michigan |
| 24 | Blanche Kunkel | 30 | wife | — | Michigan |
| 25 | June Kunkel | 13 | daughter | — | Michigan |
| 26 | William Kunkel | 11 | son | — | Michigan |
| 27 | Mary Ann Kunkel | 6 | daughter | — | Michigan |
| 28 | Ronald Kunkel | 2 | son | — | Michigan |
| 29 | Steven Gibson | 27 | lodger | Driver | Michigan |
| 30 | Edith Carlson | 37 | lodger | Cook | Michigan |
| 31 | John Davidson | 40 | head | Repairman | Michigan |
| 32 | Pearl Davidson | 36 | wife | — | Michigan |
| 33 | John Davidson | 14 | son | — | Michigan |
| 34 | Richard Davidson | 12 | son | — | Michigan |
| 35 | Robert Davidson THIS PERSON | 11 | son | — | Michigan |
| 36 | Delores Davidson | 9 | daughter | — | Michigan |
| 37 | Gertrude Davidson | 8 | daughter | — | Michigan |
| 38 | Dorothy Davidson | 5 | daughter | — | Michigan |
| 39 | Mary Davidson | 4 | daughter | — | Michigan |
| 40 | Julien Davidson | 2 | daughter | — | Michigan |
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)