MJ
Mary Jensen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Francisco-County, California
Our Model Tree links this Mary Jensen across the 1920, 1930 and 1940 US Censuses in San-Francisco-County, California (XGBoost, ~Confirmed) — first a spouse (b.~1889), then head of a 3-person household.
Age 51
b. ~1889
Female
Spouse
Born: California
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Francisco-County, California |
| Surname | Jensen |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | San Francisco |
| Est. Birth Year | ~1889 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Archilles Jensen | Head | — | 53 | ~1887 |
| Kenneth Jensen | Son | — | 17 | ~1923 |
| Mary Jensen | Spouse | — | 51 | ~1889 |
Census Appearances
1920
San Francisco, …
Spouse, age 31
San Francisco, California · implied b. ~1889 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | California |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Francisco, …
Spouse, age 40
San Francisco, California · implied b. ~1890 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jensen |
| Given Name | May M |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | California |
| Age at First Marriage | 37 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Francisco-County, California
Spouse, age 51
San-Francisco-County, California · implied b. ~1889 — 3 household members
| Surname | Jensen |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
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 Mary Jensen across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Jensen
Spouse · 1940 · age 51 · b. ~1889 · 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-Francisco-County, California
Open full size
1940 US Federal Census — San-Francisco-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00299-00020)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Luigi Ferro | 40 | Lodger | Bottle Washer | Italy |
| 42 | Bernard Damalle | 44 | Lodger | Proprietor | Italy |
| 43 | Archilles Jensen | 53 | Head | Watchman | California |
| 44 | Mary Jensen THIS PERSON | 51 | Wife | — | California |
| 45 | Kenneth Jensen | 17 | Son | — | California |
| 46 | Frances Trentacosta | 44 | Head | Fisherman | New York |
| 47 | Inez Trentacosta | 39 | Wife | — | Italy |
| 48 | Joseph Trentacosta | 16 | Son | — | California |
| 49 | Angelo Trentacosta | 14 | Son | — | California |
| 50 | Frances Trentacosta | 11 | Daughter | — | California |
| 51 | Frances Trentacosta | 78 | Mother | — | Italy |
| 52 | Gaetano Camera | 49 | Head | Rigger | Italy |
| 53 | Palmina Camera | 36 | Wife | — | Italy |
| 54 | Theresa Camera | 14 | Daughter | — | California |
| 55 | Salvator Camera | 7 | Son | — | California |
| 56 | Nicholds Camera | 4 | Son | — | California |
| 57 | Louis Calagna | 34 | Head | Proprietor | California |
| 58 | Gilda Calagna | 28 | Wife | Proprietor | Italy |
| 59 | Leo Corradi | 62 | Head | Rigger | Italy |
| 60 | Elizabeth Corradi | 52 | Wife | — | Italy |
| 61 | Vincent Corradi | 26 | Son | Ship Feeder | California |
| 62 | Betty Corradi | 23 | Daughter | Laborer | California |
| 63 | Inez Corradi | 18 | Daughter | Poultry Plucker | California |
| 64 | Josephine Corradi | 14 | Daughter | — | California |
| 65 | Hanna Corradi | 10 | Daughter | — | California |
| 66 | Salvator Bruno | 46 | Head | Retail Fish Peddler | Italy |
| 67 | Mary Bruno | 42 | Wife | — | Louisiana |
| 68 | Dominic Monterosso | 36 | Head | Fisherman | Italy |
| 69 | Mary Monterosso | 29 | Wife | — | California |
| 70 | Rose Monterosso | 12 | Daughter | — | California |
| 71 | Providence Monterosso | 9 | Daughter | — | California |
| 72 | Frances Monterosso | 8 | Daughter | — | California |
| 73 | Mario Monterosso | 4 | Son | — | California |
| 74 | Anselmo Giannini | 63 | Head | — | Italy |
| 75 | Adone Del Tessantoro | 33 | Head | Automobile Mechanic | Italy |
| 76 | Louise Del Tessantoro | 36 | Wife | — | Italy |
| 77 | Lorraine Del Tessantoro | 6 | Daughter | — | California |
| 78 | Lillian Del Tessantoro | 2 | Daughter | — | California |
| 79 | Joseph Bevinacqua | 30 | Head | Boat Builder | California |
| 80 | Alma Bevinacqua | 21 | Wife | — | California |
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)