MC
Mary Cramer — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Alameda-County, California
Our Model Tree links this Mary Cramer across the 1930 and 1940 US Censuses in Alameda-County, California (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 8-person household.
Age 17
b. ~1923
Female
Daughter
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Alameda-County, California |
| Surname | Cramer |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Oakland |
| 1935 Residence (County) | Alameda |
| Additional Details | |
| Occupation | No |
| Industry | No |
| Class of Worker | S |
| Hours Worked | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | Oakland |
| Est. Birth Year | ~1923 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Cathrine Cramer | Daughter | — | 15 | ~1925 |
| Alice Cramer | Daughter | — | 1 | ~1939 |
| Mary Cramer | Daughter | — | 17 | ~1923 |
| Margaret Cramer | Daughter | — | 13 | ~1927 |
| Shirley Cramer | Daughter | — | 16 | ~1924 |
| Elsie Cramer | Spouse | — | 39 | ~1901 |
| James Cramer | Son | — | 12 | ~1928 |
| Charles Cramer | Head | — | 57 | ~1883 |
Census Appearances
1930
Alameda, California
Daughter, age 6
Alameda, California · implied b. ~1924 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cramer |
| Given Name | Mary F |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Alameda-County, California
Daughter, age 17
Alameda-County, California · implied b. ~1923 — 8 household members
| Surname | Cramer |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Oakland |
| 1935 Residence (County) | Alameda |
| Occupation | No |
| Industry | No |
| Class of Worker | S |
| Hours Worked | 0 |
| Highest Grade | Hs 4 |
| 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 Cramer across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Cramer
Daughter · 1940 · age 17 · b. ~1923 · California
★ You are viewing this record
Sibling
Alice Cramer
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Shirley Cramer
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Cathrine Cramer
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Cramer
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Cramer
Sibling · 1940 · age 12
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 — Alameda-County, California
Open full size
1940 US Federal Census — Alameda-County, California
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00437-00204)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Melvin Knutson | 45 | Head | No | California |
| 2 | Arlene Knutson | 13 | Daughter | — | California |
| 3 | Susan Violet M Knutson | 17 | Daughter | — | California |
| 4 | Adeline Hennessy | 33 | Head | No | Illinois |
| 5 | Rosalind Hennessy | 9 | Daughter | — | Illinois |
| 6 | Shirley Hennessy | 6 | Daughter | — | Illinois |
| 7 | Jack L Witzel | 33 | Head | Mechanic | Utah |
| 8 | Verna N Witzel | 31 | Wife | No | California |
| 9 | Wayne D Witzel | 13 | Daughter | — | California |
| 10 | Lorraine Witzel | 7 | Daughter | — | California |
| 11 | Jack W Witzel | 5 | Son | — | California |
| 12 | Jasper Mccoy | 72 | Head | No | Texas |
| 13 | Lula M Mccoy | 47 | Wife | No | Kansas |
| 14 | Mary Figaro | 72 | Head | No | Portugal |
| 15 | John Rodrigues | 53 | Son | Street Dept | Hawaii |
| 16 | Elliot Rodrigues | 15 | Grandson | No | California |
| 17 | Theodore Rodrigues | 10 | Grandson | — | California |
| 18 | Antonio Fiscorra | 43 | Head | Tailor | New York |
| 19 | Theresa Fiscorra | 31 | Wife | No | Italy |
| 20 | Richard Fiscorra | 3 | Son | — | California |
| 21 | Frank J Cambra | 42 | Head | Teamster | California |
| 22 | Mary Cambra | 36 | Wife | No | California |
| 23 | John Cambra | 14 | Son | — | California |
| 24 | Alfred Cambra | 12 | Son | — | California |
| 25 | Frank Jr Cambra | 9 | Son | — | California |
| 26 | George Halsey | 57 | Head | Elevator Op | California |
| 27 | Ida M Halsey | 49 | Wife | No | Missouri |
| 28 | Tony J Mangini | 39 | Head | Receiving Clerk | New Hampshire |
| 29 | Clara M Cramer | 76 | Head | Dress Maker | Indiana |
| 30 | Charles H Cramer | 57 | Head | No | Nebraska |
| 31 | Elsie M Cramer | 39 | Wife | No | Nebraska |
| 32 | Mary E Cramer THIS PERSON | 17 | Daughter | No | California |
| 33 | Shirley M Cramer | 16 | Daughter | No | California |
| 34 | Cathrine B Cramer | 15 | Daughter | No | California |
| 35 | Margaret M Cramer | 13 | Daughter | — | California |
| 36 | James M Cramer | 12 | Son | — | California |
| 37 | Alice W Cramer | 1 | Daughter | — | California |
| 38 | Earl M Cothran | 23 | Head | Painter | Missouri |
| 39 | Vanda J Cothran | 20 | Wife | No | 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)