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Mary Mcdermott — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this Mary Mcdermott across the 1920, 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed) — first a head (b.~1871), then head of a 3-person household.
Age 69
b. ~1871
Female
Head
Born: Ireland
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | McDermott |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 69 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | Philadelphia |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | No 4 |
| 1935 Residence | Same Place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | Philadelphia |
| Est. Birth Year | ~1871 |
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 |
|---|---|---|---|---|
| Mary Mcdermott | Daughter | — | 25 | ~1915 |
| Mary Mcdermott | Head | — | 69 | ~1871 |
| Philip Mcdermott | Spouse | — | 70 | ~1870 |
Census Appearances
1920
Philadelphia, Pennsylvania
Spouse, age 48
Philadelphia, Pennsylvania · implied b. ~1872 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | Margaret |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1885 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
Philadelphia, Pennsylvania
Other, age 60
Philadelphia, Pennsylvania · implied b. ~1870 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | Margaret |
| Relationship to Head | Boarder |
| Sex | F |
| Color / Race | White |
| Age | 60 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1884 |
| Age at First Marriage | 20 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Painter |
| Industry | Hotel |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Philadelphia-County, Pennsylvania
Head, age 69
Philadelphia-County, Pennsylvania · implied b. ~1871 — 3 household members
| Surname | McDermott |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 69 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | Philadelphia |
| Naturalization Status | Naturalized |
| Highest Grade | No 4 |
| 1935 Residence | Same Place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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 Mcdermott across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Mcdermott
Head · 1940 · age 69 · b. ~1871 · Pennsylvania
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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 — 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-t0627-03713-00083)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Raymond Burke | 25 | Son | Asst Mang | Pennsylvania |
| 2 | Dorothy Burke | 22 | Daughter | Typist | Pennsylvania |
| 3 | Samuel Roth | 24 | Head | Lathe Hand | Pennsylvania |
| 4 | Eleanor Roth | 21 | Wife | — | Pennsylvania |
| 5 | Robert S Roth | 1 | Son | — | Pennsylvania |
| 6 | David Alberto | 22 | Head | Paver | Pennsylvania |
| 7 | Boella Alberto | 23 | Wife | — | Pennsylvania |
| 8 | William Alberto | 5 | Son | — | Pennsylvania |
| 9 | Nancy Alberto | 2 | Daughter | — | Pennsylvania |
| 10 | William Farmer | 26 | Brother in law | Knitter | Pennsylvania |
| 11 | Patrick Murphy | 67 | Head | — | Ireland |
| 12 | Catherine Murphy | 65 | Wife | — | Ireland |
| 13 | William Murphy | 27 | Son | Inspector | Pennsylvania |
| 14 | Sarah Murphy | 22 | Daughter in law | Helper | Pennsylvania |
| 15 | John E Mcgovern | 46 | Head | Coal Cleaner | New Jersey |
| 16 | Mary M Mcgovern | 36 | Wife | — | Pennsylvania |
| 17 | Mary E Mcgovern | 11 | Daughter | — | Pennsylvania |
| 18 | John E Mcgovern | 6 | Son | — | Pennsylvania |
| 19 | John O'Neill | 26 | Brother in law | Fireman | Pennsylvania |
| 20 | Anna P O'Neill | 33 | Sister in law | Canader | Pennsylvania |
| 21 | Mary Mcdermott THIS PERSON | 69 | Head | — | Ireland |
| 22 | Philip Mcdermott | 70 | Husband | — | Ireland |
| 23 | Mary F Mcdermott | 25 | Daughter | Typist | Pennsylvania |
| 24 | Samuel Mccue | 58 | Head | Grading | Pennsylvania |
| 25 | Fannie Mccue | 46 | Wife | — | Pennsylvania |
| 26 | Catherine Mccue | 10 | Daughter | — | Pennsylvania |
| 27 | Margaret Monahan | 45 | Head | Confectioner | Pennsylvania |
| 28 | Frank Monahan | 78 | Father | — | Pennsylvania |
| 29 | Jeannette Weigle | 28 | Neice | Typist | Pennsylvania |
| 30 | Carl Franke | 39 | Head | Machinist | Germany |
| 31 | Hedwig Franke | 40 | Wife | — | Germany |
| 32 | Carl Jr Franke | 2 | Son | — | Pennsylvania |
| 33 | Levinia Tracy | 65 | Head | — | Pennsylvania |
| 34 | Susanna Brewer | 67 | Sister | — | Pennsylvania |
| 35 | Hugh Mccarron | 38 | Head | Steam Fitter | Pennsylvania |
| 36 | Mary Mccarron | 39 | Wife | — | New York |
| 37 | Margaret Mccarron | 19 | Daughter | Clerk | Pennsylvania |
| 38 | Hugh Jr Mccarron | 17 | Son | Refosteration | Pennsylvania |
| 39 | Chas J Mccarron | 15 | Son | — | Pennsylvania |
| 40 | Thomas Mccarron | 14 | Son | — | Pennsylvania |
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)