BJ
Bertha Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · St.-Clair-County, Michigan
Our Model Tree links this Bertha Johnson across the 1920, 1930 and 1940 US Censuses in St.-Clair-County, Michigan (XGBoost, ~Confirmed), with identified parents Fred & Fred — first a daughter (b.~1919), then head of a 6-person household.
Age 21
b. ~1919
Female
Daughter
Born: Michigan
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | St.-Clair-County, Michigan |
| Surname | Johnson |
| Given Name | Bertha |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Michigan |
| 1935 Residence (City) | R |
| 1935 Residence (County) | St Clair |
| Additional Details | |
| Occupation | Laborer |
| Industry | Auto Factory |
| Class of Worker | PW |
| Hours Worked | 16 |
| Income (1939) | 300 |
| Highest Grade | No 8 |
| 1935 Residence | Michigan |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Occupation | Laborer |
| Township / Ward | Cottrellville |
| 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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Bertha | Age | Birth yr |
|---|---|---|---|---|
| Bertha Johnson | Daughter | — | 21 | ~1919 |
| Elizabeth Johnson | Daughter | — | 25 | ~1915 |
| Helen Johnson | Daughter | — | 23 | ~1917 |
| Fred Johnson | Head | — | 68 | ~1872 |
| Frederick Johnson | Son | — | 13 | ~1927 |
| Mary Johnson | Spouse | — | 65 | ~1875 |
Census Appearances
1920
St Clair, …
Daughter, age 1
St Clair, Michigan · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Bertha |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1930
St Clair, …
Daughter, age 11
St Clair, Michigan · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Bertha |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Can Read/Write | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1940
St.-Clair-County, Michigan
Daughter, age 21
St.-Clair-County, Michigan · implied b. ~1919 — 6 household members
| Surname | Johnson |
| Given Name | Bertha |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Michigan |
| 1935 Residence (City) | R |
| 1935 Residence (County) | St Clair |
| Occupation | Laborer |
| Industry | Auto Factory |
| Class of Worker | PW |
| Hours Worked | 16 |
| Income (1939) | 300 |
| Highest Grade | No 8 |
| 1935 Residence | Michigan |
| 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 Bertha Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Fred Johnson (~0.92 confidence) and father Fred Johnson (~0.92 confidence) and father Frederick Johnson (~0.92 confidence) and mother Mary Johnson (~0.92 confidence) and mother Mary Johnson (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Fred Johnson
b. ~1871
Source father
● Household
· direct · ~0.92
Father
Fred Johnson
b. ~1872
Source father
● Household
· direct · ~0.92
Father
Frederick Johnson
b. ~1873
Source father
● Household
· direct · ~0.92
Mother
Mary Johnson
b. ~1875
Source mother
● Household
· direct · ~0.92
Mother
Mary Johnson
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Bertha Johnson
Daughter · 1940 · age 21 · b. ~1919 · Michigan
★ You are viewing this record
Sibling
Frederick Johnson
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Johnson
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Johnson
Sibling · 1940 · age 25
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 — St.-Clair-County, Michigan
Open full size
1940 US Federal Census — St.-Clair-County, Michigan
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01815-00328)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Bert Smith | 48 | Head | Sailor | Michigan |
| 2 | Mildred Smith | 45 | Wife | — | Michigan |
| 3 | Basil Smith | 25 | Son | Sailor | Michigan |
| 4 | Ray Smith | 22 | Son | Laborer | Michigan |
| 5 | Clarence Smith | 17 | Son | — | Michigan |
| 6 | Juanita Smith | 12 | Daughter | — | Michigan |
| 7 | Rose Mary Smith | 11 | Daughter | — | Michigan |
| 8 | Marie Smith | 8 | Daughter | — | Michigan |
| 9 | Barbara Smith | 7 | Daughter | — | Michigan |
| 10 | Gerald Guyot | 30 | Head | Printer | Michigan |
| 11 | Lydia Guyot | 28 | Wife | — | Michigan |
| 12 | Grace Mary Guyot | 5 | Daughter | — | Michigan |
| 13 | Robert Guyot | 3 | Son | — | Michigan |
| 14 | Carol Jean Guyot | 2 | Daughter | — | Michigan |
| 15 | Barbara Guyot | 0 | Daughter | — | Michigan |
| 16 | Charles Bottrell | 75 | Head | Sailor | Michigan |
| 17 | Charles Basney | 52 | Head | Carpenter | Michigan |
| 18 | Gladys Basney | 50 | Wife | — | Michigan |
| 19 | Marjora Basney | 16 | Daughter | — | Michigan |
| 20 | Nancy Ezon | 72 | Head | — | Germany |
| 21 | Fred Hansel | 74 | Head | Farmer | Germany |
| 22 | Julia Hansel | 73 | Wife | — | Germany |
| 23 | Robert Bromlee | 39 | Head | Electrician | Michigan |
| 24 | May Bromlee | 32 | Wife | Manager | Michigan |
| 25 | William Smith | 41 | Head | Band Sawyer | Michigan |
| 26 | Marjurella Smith | 36 | Wife | — | Michigan |
| 27 | William Smith | 18 | Son | Laborer | Michigan |
| 28 | Douglas Smith | 16 | Son | — | Michigan |
| 29 | Norman Smith | 15 | Son | — | Michigan |
| 30 | Mario Currier | 35 | Head | House Work | Michigan |
| 31 | Richard Currier | 8 | Son | — | Michigan |
| 32 | Fred Johnson | 68 | Head | Laborer Farmer | Michigan |
| 33 | Mary Johnson | 65 | Wife | — | Michigan |
| 34 | Elizabeth Johnson | 25 | Daughter | House Work | Michigan |
| 35 | Helen Johnson | 23 | Daughter | Laborer | Michigan |
| 36 | Bertha Johnson THIS PERSON | 21 | Daughter | Laborer | Michigan |
| 37 | Frederick Johnson | 13 | Son | — | Michigan |
| 38 | Vernon Mc Louth | 40 | Head | Mechanic | Illinois |
| 39 | Mabel Elenor Mc Louth | 38 | Wife | — | Washington |
| 40 | Carolyn Jane Mc Louth | 13 | Daughter | — | Washington |
Pedigree Summary
Bertha + 3 siblings
Gen 1 · 5 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)