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Frank Mason — 1940 US Census Record
Model Tree available1940 United States Federal Census · St.-Louis-County, Missouri
Our Model Tree links this Frank Mason across the 1920, 1930 and 1940 US Censuses in St.-Louis-County, Missouri (XGBoost, ~Confirmed), with identified parents William & William — first a son (b.~1909), then head of a 5-person household.
Age 31
b. ~1909
Male
Son
Born: Missouri
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | St.-Louis-County, Missouri |
| Surname | Mason |
| Given Name | Frank |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Bonhomme Township |
| 1935 Residence (County) | ST. LOUIS |
| Additional Details | |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Township / Ward | Bonhomme Township |
| Est. Birth Year | ~1909 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Frank | Age | Birth yr |
|---|---|---|---|---|
| Julia Mason | Spouse | — | 62 | ~1878 |
| Frank Mason | Son | — | 31 | ~1909 |
| Robert Mason | Son | — | 22 | ~1918 |
| Charles Mason | Son | — | 25 | ~1915 |
| William Mason | Head | — | 66 | ~1874 |
Census Appearances
1920
St Louis, …
Son, age 11
St Louis, Missouri · implied b. ~1909 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Frank |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1930
St Louis, …
Son, age 21
St Louis, Missouri · implied b. ~1909 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Frank |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Occupation | Laborer |
| Industry | Dairy Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
St.-Louis-County, Missouri
Son, age 31
St.-Louis-County, Missouri · implied b. ~1909 — 5 household members
| Surname | Mason |
| Given Name | Frank |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Bonhomme Township |
| 1935 Residence (County) | ST. LOUIS |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
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 Frank Mason across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father William Mason (~0.92 confidence) and father William Mason (~0.92 confidence) and father William Mason (~0.92 confidence) and mother Julia Mason (~0.92 confidence) and mother Dora Mason (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
William Mason
b. ~1874
Source father
● Household
· direct · ~0.92
Father
William Mason
b. ~1874
Source father
● Household
· direct · ~0.92
Father
William Mason
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Julia Mason
b. ~1877
Source mother
● Household
· direct · ~0.92
Mother
Dora Mason
b. ~1878
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Frank Mason
Son · 1940 · age 31 · b. ~1909 · Missouri
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Sibling
Charles Mason
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Mason
Sibling · 1940 · age 22
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.-Louis-County, Missouri
Open full size
1940 US Federal Census — St.-Louis-County, Missouri
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02147-00741)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Hilda Du May | 29 | Wife | — | Illinois |
| 42 | Frank Lampe | 69 | Head | — | Missouri |
| 43 | Lawrence Scheller | 46 | Head | Clerk | Missouri |
| 44 | Nellie Scheller | 41 | Wife | — | New York |
| 45 | John Ricks | 75 | Father | — | Pennsylvania |
| 46 | Robert Ricks | 26 | Head | Truck Driver | Missouri |
| 47 | Dorothy Ricks | 21 | Wife | Waitress | Missouri |
| 48 | Frank Mehouse | 45 | Head | Manager | Missouri |
| 49 | Mary Mehouse | 39 | Wife | — | Missouri |
| 50 | John E. Wilson | 48 | Head | Operator | Missouri |
| 51 | Nellie Wilson | 45 | Wife | — | Missouri |
| 52 | Beryle Wilson | 17 | Daughter | — | Missouri |
| 53 | Clay Mott | 21 | Hired Man | Hired Man | Missouri |
| 54 | Sylvester V. Maness | 63 | Head | Operator | Missouri |
| 55 | Nora Maness | 54 | Wife | — | Missouri |
| 56 | Guy Maness | 20 | Son | Operator | Missouri |
| 57 | Edward Kohlhaff | 54 | Head | Operator | Missouri |
| 58 | Anna Kohlhaff | 49 | Wife | — | Illinois |
| 59 | Robert Kohlhaff | 82 | Father | — | Missouri |
| 60 | Orville Wallace | 35 | Head | Woodcutter | Missouri |
| 61 | Mildred Wallace | 27 | Wife | — | Missouri |
| 62 | Christina Wallace | 4 | Daughter | — | Missouri |
| 63 | Frank Grahn | 34 | Head | Off Bearer | Missouri |
| 64 | Nellie Grahn | 33 | Wife | — | Missouri |
| 65 | Cecil R. Grahn | 11 | Son | — | Missouri |
| 66 | James Grahn | 9 | Son | — | Missouri |
| 67 | Rachel Grahn | 7 | Daughter | — | Missouri |
| 68 | Frank Grahn | 5 | Son | — | Missouri |
| 69 | William Mason | 66 | Head | Operator | Missouri |
| 70 | Julia Mason | 62 | Wife | — | Missouri |
| 71 | Frank Mason THIS PERSON | 31 | Son | — | Missouri |
| 72 | Charles Mason | 25 | Son | Operator | Missouri |
| 73 | Robert Mason | 22 | Son | Operator | Missouri |
| 74 | Ralph E. Graves | 52 | Head | Movie Operator | Missouri |
| 75 | Mary Graves | 52 | Wife | — | Missouri |
| 76 | James H. Mckinley | 51 | Head | — | Iowa |
| 77 | Vincent Fehringer | 31 | Head | Adjuster | Missouri |
| 78 | Patricia Fehringer | 27 | Wife | — | Missouri |
| 79 | Charles Scott | 44 | Head | Laborer | Missouri |
| 80 | Hazel Scott | 36 | Wife | — | Missouri |
Pedigree Summary
Frank + 2 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)