MJ
Mary Jacobs — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Bernardino-County, California
Our Model Tree links this Mary Jacobs across the 1920, 1930 and 1940 US Censuses in San-Bernardino-County, California (XGBoost, ~Confirmed) — first a spouse (b.~1894), then head of a 4-person household.
Age 46
b. ~1894
Female
Spouse
Born: Kansas
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Bernardino-County, California |
| Surname | Jacobs |
| Given Name | Mary O |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Kansas |
| 1935 Residence (City) | Upland City |
| 1935 Residence (County) | San Bernardino |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | C 2 |
| 1935 Residence | Same place |
| Birth State | Kansas |
| Birth Country | United States |
| Birthplace (normalized) | kansas |
| Township / Ward | Upland City |
| Est. Birth Year | ~1894 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Pauline Jacobs | Daughter | — | 15 | ~1925 |
| Genevieve Jacobs | Daughter | — | 19 | ~1921 |
| Fred Jacobs | Head | — | 49 | ~1891 |
| Mary Jacobs | Spouse | — | 46 | ~1894 |
Census Appearances
1920
San Bernardino, …
Other, age 26
San Bernardino, California · implied b. ~1894 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jacobs |
| Given Name | Mary G |
| Relationship to Head | Lodger |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Kansas |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Texas |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Kansas |
| Birth Country | United States |
| Birthplace (normalized) | kansas |
1930
San Bernardino, …
Other, age 36
San Bernardino, California · implied b. ~1894 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jacobs |
| Given Name | Mary O |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Kansas |
| Age at First Marriage | 26 |
| Father's Birthplace | Kansas |
| Mother's Birthplace | Texas |
| Can Read/Write | Yes |
| Birth State | Kansas |
| Birth Country | United States |
| Birthplace (normalized) | kansas |
1940
San-Bernardino-County, California
Spouse, age 46
San-Bernardino-County, California · implied b. ~1894 — 4 household members
| Surname | Jacobs |
| Given Name | Mary O |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Kansas |
| 1935 Residence (City) | Upland City |
| 1935 Residence (County) | San Bernardino |
| Class of Worker | 0 |
| Highest Grade | C 2 |
| 1935 Residence | Same place |
| Birth State | Kansas |
| Birth Country | United States |
| Birthplace (normalized) | kansas |
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 Jacobs across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Jacobs
Spouse · 1940 · age 46 · b. ~1894 · California
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — San-Bernardino-County, California
Open full size
1940 US Federal Census — San-Bernardino-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00294-00455)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Fred M Jacobs | 49 | Head | Judge | California |
| 42 | Mary O Jacobs THIS PERSON | 46 | Wife | — | Kansas |
| 43 | Genevieve D Jacobs | 19 | Daughter | — | California |
| 44 | Pauline Jacobs | 15 | Daughter | — | California |
| 45 | Sadie F Benners | 67 | Head | Nurse Practical | Wisconsin |
| 46 | Raymond Benners | 27 | Son | Mechanic | Arizona |
| 47 | Edwin Miller | 70 | Head | Gardner | Illinois |
| 48 | Emma Miller | 72 | Wife | — | Pennsylvania |
| 49 | George Benson | 39 | Head | Box Maker | Kentucky |
| 50 | Mildred Benson | 38 | Wife | Orange Packer | Kentucky |
| 51 | Robert H Benson | 12 | Son | — | California |
| 52 | Florence H Fisher | 82 | Head | — | Ohio |
| 53 | Clara Fisher | 59 | Daughter | — | Kansas |
| 54 | Edward Fisher | 48 | Son | — | Illinois |
| 55 | Paul Mcintosh | 35 | Head | — | Tennessee |
| 56 | Marjorie Mcintosh | 32 | Wife | Nurse | Kansas |
| 57 | Marilyn Mcintosh | 3 | Daughter | — | California |
| 58 | Thomas C Mitchell | 54 | Head | Plumber | Illinois |
| 59 | Clara M Mitchell | 48 | Wife | — | Kansas |
| 60 | Rosemary Ann Mitchell | 10 | Daughter | — | California |
| 61 | George W Pearson | 54 | Head | Storekeeper | Georgia |
| 62 | Ada B Pearson | 38 | Wife | Lemon Packer | Texas |
| 63 | Henry Harms | 66 | Head | Purchasing Agt | Illinois |
| 64 | Nettie Harms | 58 | Wife | — | Missouri |
| 65 | Helen Harms | 34 | Daughter | — | California |
| 66 | Emeline Hargrove | 74 | Head | — | Georgia |
| 67 | William Morley | 68 | Head | — | England |
| 68 | Sophia Morley | 55 | Wife | — | Nebraska |
| 69 | Louella M Rockinghill | 61 | Head | Writer | Utah |
| 70 | Bernice Anysch | 32 | Head | Bookkeeper | North Dakota |
| 71 | Malcolm Anysch | 14 | Son | — | California |
| 72 | Carol Ann Anysch | 3 | Daughter | — | California |
| 73 | James Baldwin | 73 | Head | — | Tennessee |
| 74 | Minnie Baldwin | 59 | Wife | — | Missouri |
| 75 | Fern Baldwin | 30 | Daughter | Nurse | Colorado |
| 76 | Dorothy Hadenhaugh | 25 | Lodger | Nurse | Ohio |
| 77 | Ray Knighton | 51 | Head | Salesman | Ohio |
| 78 | Josephine Knighton | 50 | Wife | Bookkeeper | California |
| 79 | Jack E Knighton | 19 | Son | — | California |
| 80 | Thomas Peter Knighton | 10 | Son | — | 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)