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Mary Mcdonnell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Los-Angeles-County, California
Our Model Tree links this Mary Mcdonnell across the 1930 and 1940 US Censuses in Los-Angeles-County, California (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 6-person household.
Age 12
b. ~1928
Female
Daughter
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Los-Angeles-County, California |
| Surname | McDonnell |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | California |
| Additional Details | |
| Highest Grade | 0 |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | Sierra Madre City |
| Est. Birth Year | ~1928 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Frances Mcdonnell | Spouse | — | 32 | ~1908 |
| Glory Mcdonnell | Daughter | — | 2 | ~1938 |
| William Mcdonnell | Son | — | 6 | ~1934 |
| John Mcdonnell | Son | — | 5 | ~1935 |
| William Mcdonnell | Head | — | 39 | ~1901 |
| Mary Mcdonnell | Daughter | — | 12 | ~1928 |
Census Appearances
1930
Los Angeles, …
Daughter, age 1
Los Angeles, California · implied b. ~1929 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDaniel |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Los-Angeles-County, California
Daughter, age 12
Los-Angeles-County, California · implied b. ~1928 — 6 household members
| Surname | McDonnell |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | California |
| Highest Grade | 0 |
| 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 Mcdonnell across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mcdonnell
Daughter · 1940 · age 12 · b. ~1928 · California
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Sibling
John Mcdonnell
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Glory Mcdonnell
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Mcdonnell
Sibling · 1940 · age 6
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 — Los-Angeles-County, California
Open full size
1940 US Federal Census — Los-Angeles-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00237-00928)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | James T. Council | 50 | Head | U | Virginia |
| 2 | Louise J. Council | 52 | Wife | Typist | Illinois |
| 3 | James G. Jr. Council | 10 | Son | — | California |
| 4 | Virginia L. Council | 8 | Daughter | — | California |
| 5 | Pauline Wolpert | 74 | Head | — | Russia |
| 6 | Helodia Hinojos | 54 | Head | — | Mexico |
| 7 | Joe Hinojos | 25 | Son | Photographer | Texas |
| 8 | Philip De La Pena | 34 | Head | Attendant | Philippines |
| 9 | Vallie De La Pena | 24 | Wife | Maid | Tennessee |
| 10 | Anita De La Pena | 7 | Daughter | — | California |
| 11 | Frank Aisawa | 63 | Head | Gardener | Japan |
| 12 | Chiyo Aisawa | 48 | Wife | House Work | Japan |
| 13 | Yoshiko Aisawa | 19 | Daughter | — | California |
| 14 | David Aisawa | 14 | Son | — | California |
| 15 | Frank Umekubo | 47 | Head | — | Japan |
| 16 | Hideko Umekubo | 38 | Wife | — | Japan |
| 17 | Yoshihisa Umekubo | 18 | Son | — | California |
| 18 | Takashi Umekubo | 17 | Son | — | California |
| 19 | Yoshiko Umekubo | 11 | Daughter | — | California |
| 20 | George Shimizu | 52 | Head | Peddler | Japan |
| 21 | Mitsue Shimizu | 44 | Wife | House Work | Japan |
| 22 | Kimiko Shimizu | 20 | Daughter | — | California |
| 23 | George K. Shimizu | 16 | Son | — | California |
| 24 | William J. Mcdonnell | 39 | Head | Chainman | Minnesota |
| 25 | Frances F. Mcdonnell | 32 | Wife | — | California |
| 26 | William J. Jr. Mcdonnell | 6 | Son | — | California |
| 27 | John P. Mcdonnell | 5 | Son | — | California |
| 28 | Glory F. Mcdonnell | 2 | Daughter | — | California |
| 29 | Mary E. Mcdonnell THIS PERSON | 12 | Daughter | — | California |
| 30 | Harry Rubenstein | 41 | Head | — | Russia |
| 31 | Jeanette Rubenstein | 32 | Wife | — | Ohio |
| 32 | Henry Conde | 46 | Head | — | Poland |
| 33 | Rose Conde | 39 | Wife | — | Mexico |
| 34 | Julian Conde | 7 | Son | — | California |
| 35 | John O. Hammers | 35 | Head | Tractor Operator | Oklahoma |
| 36 | Birdie Hammers | 30 | Wife | — | Oklahoma |
| 37 | Judith Hammers | 14 | Daughter | — | Oklahoma |
| 38 | Wanda Lee Hammers | 7 | Daughter | — | Oklahoma |
| 39 | Pansy Hammers | 6 | Daughter | — | Oklahoma |
| 40 | Erlane Hammers | 4 | Daughter | — | Oklahoma |
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)