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Frank Mason — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Mateo-County, California
Our Model Tree links this Frank Mason across the 1920, 1930 and 1940 US Censuses in San-Mateo-County, California (XGBoost, ~Confirmed) — first a head (b.~1883), then head of a 3-person household.
Age 57
b. ~1883
Male
Head
Born: England
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Mateo-County, California |
| Surname | Mason |
| Given Name | Frank H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Hillsborough |
| 1935 Residence (County) | San Mateo |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | chauffeur |
| Industry | private home |
| Class of Worker | PW |
| Hours Worked | 70 |
| Income (1939) | 1800 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | England |
| Birthplace (normalized) | england |
| Occupation | Chauffeur |
| Township / Ward | Hillsborough |
| Est. Birth Year | ~1883 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Frank | Age | Birth yr |
|---|---|---|---|---|
| Frank Mason | Head | — | 57 | ~1883 |
| Pauline Mason | Daughter | — | 27 | ~1913 |
| Annie Mason | Spouse | — | 58 | ~1882 |
Census Appearances
1920
Alameda, California
Head, age 37
Alameda, California · implied b. ~1883 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Frank |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | England |
| Year of Immigration | 1906 |
| Naturalization Status | First papers filed |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Occupation | Chauffeur |
| Industry | Private family |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth Country | England |
| Birthplace (normalized) | england |
1930
San Mateo, …
Head, age 47
San Mateo, California · implied b. ~1883 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mason |
| Given Name | Frank H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | England |
| Naturalization Status | Naturalized |
| Year of Immigration | 1906 |
| Age at First Marriage | 29 |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Occupation | Chauffeur |
| Industry | Private family |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Home Value / Rent | 25.00 |
| Radio Set | R |
| Veteran | No |
| Birth Country | England |
| Birthplace (normalized) | england |
1940
San-Mateo-County, California
Head, age 57
San-Mateo-County, California · implied b. ~1883 — 3 household members
| Surname | Mason |
| Given Name | Frank H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Hillsborough |
| 1935 Residence (County) | San Mateo |
| Naturalization Status | Naturalized |
| Occupation | chauffeur |
| Industry | private home |
| Class of Worker | PW |
| Hours Worked | 70 |
| Income (1939) | 1800 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | England |
| Birthplace (normalized) | england |
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 3 locations, using XGBoost record linkage.
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This person
Anchor record
Frank Mason
Head · 1940 · age 57 · b. ~1883 · California
★ 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 — San-Mateo-County, California
Open full size
1940 US Federal Census — San-Mateo-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00330-00108)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Margaret Knefsey | 50 | Servant | Waitress | England |
| 2 | Freda Bell | 53 | Servant | Personal Maid | Germany |
| 3 | Aaron Wimbler | 36 | Head | Gardener | California |
| 4 | Marjorie Wimbler | 34 | Wife | — | California |
| 5 | Robert L. Wimbler | 11 | Son | — | California |
| 6 | Harry J. Wimbler | 7 | Son | — | California |
| 7 | Steven J. Wimbler | 1 | Son | — | California |
| 8 | Mary C. Mccreery | 66 | Head | — | Wisconsin |
| 9 | Emma Isaacs | 66 | Servant | Personal Maid | England |
| 10 | Dorothy Sutton | 29 | Servant | Secretary | England |
| 11 | George Mcrender | None | Servant | Butler | England |
| 12 | Helen Belberg | 58 | Servant | Cook | Sweden |
| 13 | Clara Russell | 61 | Servant | Upstairs Maid | England |
| 14 | Peter Radich | 50 | Head | Gardener | Yugoslavia |
| 15 | Andrew Bandur | 45 | Servant | Gardener | Yugoslavia |
| 16 | Gosta Ohlson | 36 | Head | Painter | Sweden |
| 17 | Margot Ohlson | 40 | Wife | — | Sweden |
| 18 | Benjamin C. Keator | 54 | Head | Vice President | Illinois |
| 19 | Priscilla R. Keator | 51 | Wife | — | Minnesota |
| 20 | Mabel Suzanne K. Keator | 26 | Daughter | — | Minnesota |
| 21 | Ernest Wasper | 28 | Servant | Butler | Switzerland |
| 22 | Some Suda | 45 | Servant | Cook | Japan |
| 23 | Arlett Christianson | 23 | Servant | Upstairs Maid | Minnesota |
| 24 | David Jordan | 58 | Head | Gardener | Scotland |
| 25 | Benjamin V.O. Jordan | 28 | Son | Laborer | California |
| 26 | Francis J. Jordan | 19 | Son | Assistant Gardener | California |
| 27 | Leonora H. Ormaby | 62 | Head | — | Illinois |
| 28 | Alfred Hendrickson | 43 | Servant | Coachman | California |
| 29 | Leonora Hendrickson | 27 | Daughter | — | California |
| 30 | Nesta Loveland | 52 | Servant | Housekeeper | California |
| 31 | Ada Marshall | 54 | Servant | Upstairs Maid | England |
| 32 | Sybil Nixon | 34 | Servant | Cook | Oregon |
| 33 | Edward F. Schroeder | 70 | Head | Gardener | Germany |
| 34 | Mary Schroeder | 82 | Wife | — | Germany |
| 35 | Frank H. Mason THIS PERSON | 57 | Head | Chauffeur | England |
| 36 | Annie Mason | 58 | Wife | — | England |
| 37 | Pauline Mason | 27 | Daughter | Housemaid | California |
| 38 | Ah Him | 65 | Head | Asst Gardener | China |
| 39 | Michel D. Marculescu | 47 | Head | Pharmacist Salesman | Roumania |
| 40 | Ruth E. Marculescu | 45 | Wife | — | 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)