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Margaret Mcdermott — 1940 US Census Record
Model Tree available1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this Margaret Mcdermott across the 1920, 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents James & William — first a daughter (b.~1919), then head of a 5-person household.
Age 21
b. ~1919
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | McDermott |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | Philadelphia |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Philadelphia |
| Est. Birth Year | ~1919 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| Margaret Mcdermott | Daughter | — | 21 | ~1919 |
| James Mcdermott | Head | — | 85 | ~1855 |
| William Mcdermott | Son | — | 48 | ~1892 |
| Helen Mcdermott | Daughter | — | 25 | ~1915 |
| James Mcdermott | Son | — | 50 | ~1890 |
Census Appearances
1920
Philadelphia, Pennsylvania
Daughter, age 1
Philadelphia, Pennsylvania · implied b. ~1919 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Philadelphia, Pennsylvania
Daughter, age 11
Philadelphia, Pennsylvania · implied b. ~1919 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermond |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Philadelphia-County, Pennsylvania
Daughter, age 21
Philadelphia-County, Pennsylvania · implied b. ~1919 — 5 household members
| Surname | McDermott |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | Philadelphia |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 Margaret Mcdermott across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Mcdermott (~0.92 confidence) and father William Mcdermott (~0.92 confidence) and mother Margaret Mcdermott (~0.92 confidence) and mother Margaret Mcdermond (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Mcdermott
b. ~1855
Source father
● Household
· direct · ~0.92
Father
William Mcdermott
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Margaret Mcdermott
b. ~1892
Source mother
● Household
· direct · ~0.92
Mother
Margaret Mcdermond
b. ~1883
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Margaret Mcdermott
Daughter · 1940 · age 21 · b. ~1919 · Pennsylvania
★ You are viewing this record
Sibling
James Mcdermott
Sibling · 1940 · age 50
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Mcdermott
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Mcdermott
Sibling · 1940 · age 48
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 — Philadelphia-County, Pennsylvania
Open full size
1940 US Federal Census — Philadelphia-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03700-00219)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Emily Walmsley | 65 | Mother-in-law | — | Pennsylvania |
| 42 | Jane Garlick | 57 | Lodger | — | Pennsylvania |
| 43 | Lodger Wright | None | F | Newspaper | — |
| 44 | James W. Montgomery | 47 | Head | Card Feeder | Pennsylvania |
| 45 | Marie Montgomery | 52 | Wife | — | Pennsylvania |
| 46 | Margaret Montgomery | 17 | Daughter | — | Pennsylvania |
| 47 | James Mcdermott | 85 | Head | — | Pennsylvania |
| 48 | James Mcdermott | 50 | Son | Policeman | Pennsylvania |
| 49 | William Mcdermott | 48 | Son | Spinner | Pennsylvania |
| 50 | Helen Mcdermott | 25 | Daughter | — | Pennsylvania |
| 51 | Margaret Mcdermott THIS PERSON | 21 | Daughter | — | Pennsylvania |
| 52 | Annie Schnepf | 73 | Head | — | Pennsylvania |
| 53 | Alice Schnepf | 37 | Daughter | — | Pennsylvania |
| 54 | James Lee | 46 | Lodger | Warper | Pennsylvania |
| 55 | Anna Lee | 43 | Daughter | Caddy Master | Pennsylvania |
| 56 | Harry Klah | 48 | Head | — | Pennsylvania |
| 57 | Elizabeth Klah | 49 | Wife | Mill Worker | Pennsylvania |
| 58 | Evelyn Klah | 19 | Daughter | — | Pennsylvania |
| 59 | Mary Klah | 71 | Mother | New Worker | Pennsylvania |
| 60 | William Johnson | 48 | Head | — | Pennsylvania |
| 61 | Alice Johnson | 42 | Wife | Beamer | Pennsylvania |
| 62 | William Atkinson | 64 | Head | Twister | Pennsylvania |
| 63 | Lena Atkinson | 62 | Wife | Inspector | Pennsylvania |
| 64 | Walter S. Evans | 47 | Head | — | Pennsylvania |
| 65 | Mary Evans | 47 | Wife | Salesman | Pennsylvania |
| 66 | Doris Mae Evans | 10 | Daughter | — | Pennsylvania |
| 67 | Walter Evans | 33 | Brother | Plater | Pennsylvania |
| 68 | Mildred Evans | 21 | Sister | — | Pennsylvania |
| 69 | Joanna Meice | 77 | Head | Mender | Pennsylvania |
| 70 | Dorothea Meice | 69 | Sister | Remedy Operator | Pennsylvania |
| 71 | Frank Weber | 48 | Head | — | Pennsylvania |
| 72 | Julia Weber | 45 | Wife | Caretaker | Pennsylvania |
| 73 | Joseph Weber | 23 | Son | — | Pennsylvania |
| 74 | Charles Weber | 18 | Son | Bookkeeper | Pennsylvania |
| 75 | Anna Weber | 13 | Daughter | Usher | Pennsylvania |
| 76 | Mary Schoffield | 78 | Head | — | Pennsylvania |
| 77 | Elizabeth Krank | 77 | Lodger | — | Pennsylvania |
| 78 | Margaret Duey | 72 | Lodger | — | Pennsylvania |
| 79 | Frederick B. Amie | 33 | Head | — | Pennsylvania |
| 80 | Amie | 33 | Wife | Machinist | Pennsylvania |
Pedigree Summary
Margaret + 3 siblings
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)