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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 spouse (b.~1891), then head of a 4-person household.
Age 49
b. ~1891
Female
Spouse
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | McDermott |
| Given Name | Mary A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | Philadelphia |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Laundress |
| Industry | Private |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 616 |
| Highest Grade | 6 |
| 1935 Residence | Same house |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Laundress |
| Township / Ward | Philadelphia |
| Est. Birth Year | ~1891 |
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 |
|---|---|---|---|---|
| Mary Mcdermott | Daughter | — | 19 | ~1921 |
| James Mcdermott | Head | — | 47 | ~1893 |
| James Mcdermott | Son | — | 15 | ~1925 |
| Mary Mcdermott | Spouse | — | 49 | ~1891 |
Census Appearances
1920
Philadelphia, Pennsylvania
Other, age 26
Philadelphia, Pennsylvania · implied b. ~1894 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | Mary |
| Relationship to Head | servant |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | servant |
| Industry | private family |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Birth Country | Ireland |
| Year of Naturalization | Un |
| Birthplace (normalized) | ireland |
1930
Philadelphia, Pennsylvania
Other, age 38
Philadelphia, Pennsylvania · implied b. ~1892 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | Mary |
| Relationship to Head | Servant |
| Sex | F |
| Color / Race | White |
| Age | 38 |
| Marital Status | Single |
| Birthplace | Ireland |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Servant |
| Industry | At Home |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Veteran | 1913 |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Philadelphia-County, Pennsylvania
Spouse, age 49
Philadelphia-County, Pennsylvania · implied b. ~1891 — 4 household members
| Surname | McDermott |
| Given Name | Mary A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | Philadelphia |
| Naturalization Status | Naturalized |
| Occupation | Laundress |
| Industry | Private |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 616 |
| Highest Grade | 6 |
| 1935 Residence | Same house |
| 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
Spouse · 1940 · age 49 · b. ~1891 · Pennsylvania
★ You are viewing this record
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
38 people indexed on this census page (nara:1940:m-t0627-03704-00365)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Gustav J. Bross | 75 | Head | Retired | Penna |
| 2 | James J. Melvin | 40 | Son-in-law | Salesman | Penna |
| 3 | Gertrude Melvin | 39 | Daughter | — | Penna |
| 4 | James Gordon | 53 | Head | Secretary | Penna |
| 5 | J. Kathryn Gordon | 29 | Daughter | Despatcher | Penna |
| 6 | Sarah Gordon | 24 | Daughter | Helper Stock | Penna |
| 7 | Sarah Manker | 53 | Sister | — | Penna |
| 8 | James Berry | 54 | Head | Retired O/O Health | Ireland |
| 9 | Katherine Berry | 54 | Wife | — | Ireland |
| 10 | James Berry | 18 | Son | — | Penna |
| 11 | John Berry | 17 | Son | — | Penna |
| 12 | Ann May Berry | 14 | Daughter | — | Penna |
| 13 | Mary Mcdonall | 28 | Niece | Sales Girl | Penna |
| 14 | Edmond A. Brady | 47 | Brother-in-law | Salesman | Penna |
| 15 | Mary Brady | 45 | Sister | — | Penna |
| 16 | Agnes M. Brady | 40 | Sister | Maid | Penna |
| 17 | John Mclaren | 60 | Lodger | — | Penna |
| 18 | Amos Reba | 34 | Head | Printer | Penna |
| 19 | Ruth Reba | 32 | Wife | — | Penna |
| 20 | Amelia Carvalho | 74 | Lodger | Retired | Penna |
| 21 | Frederick West | 36 | Head | Electrician | New York |
| 22 | Olive West | 31 | Wife | Solder | New York |
| 23 | Frederick J. West | 11 | Son | — | Penna |
| 24 | Catherine D. West | 2 | Daughter | — | Penna |
| 25 | Catherine West | 75 | Mother | — | Ireland |
| 26 | Ella Berthiaume | 54 | Mother-in-law | — | New York |
| 27 | John J. Berthiaume | 21 | Brother-in-law | Mechanic | New York |
| 28 | Arthur Berthiaume | 17 | Brother-in-law | Delivery Boy | New York |
| 29 | John Berthiaume | 16 | Brother-in-law | — | New York |
| 30 | Lucy Berthiaume | 14 | Sister-in-law | — | New York |
| 31 | Charles Buckey | 67 | Head | Bricklayer | Penna |
| 32 | Mary Buckey | 37 | Daughter | Lab. Asst. | N. J. |
| 33 | Cynthia Holcomb | 26 | Daughter | Winder | Penna |
| 34 | Thomas Holcomb | 2 | Son | — | Penna |
| 35 | James Mcdermott | 47 | Head | Gardener | Ireland |
| 36 | Mary A. Mcdermott THIS PERSON | 49 | Wife | Laundress | Ireland |
| 37 | James J. Mcdermott | 15 | Son | Paper Boy | Ireland |
| 38 | Mary G. Mcdermott | 19 | Daughter | Salesgirl | Ireland |
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)