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Mary Mcdermott — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Mary Mcdermott across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a spouse (b.~1879), then head of a 9-person household.
Age 61
b. ~1879
Female
Spouse
Born: Scotland
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | McDermott |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Widowed |
| Birthplace | Scotland |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Naturalization Status | Naturalized |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1879 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Regina Mcdermott | Daughter | — | 20 | ~1920 |
| Frances Mcdermott | Daughter | — | 26 | ~1914 |
| Mary Mcdermott | Daughter | — | 40 | ~1900 |
| Bernice Mcdermott | Daughter | — | 29 | ~1911 |
| James Byrne | Head | — | 25 | ~1915 |
| Joseph Mcdermott | Son | — | 23 | ~1917 |
| Timothy Byrne | Son | — | 1 | ~1939 |
| Mary Byrne | Spouse | — | 26 | ~1914 |
| Mary Mcdermott | Spouse | — | 61 | ~1879 |
Census Appearances
1920
Allegheny, Pennsylvania
Other, age 41
Allegheny, Pennsylvania · implied b. ~1879 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | Mary B. |
| Relationship to Head | Sister |
| Sex | F |
| Color / Race | White |
| Age | 41 |
| Marital Status | Single |
| Birthplace | Scotland |
| Year of Immigration | 1883 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Year of Naturalization | 1890 |
| Birthplace (normalized) | scotland |
1930
Allegheny, Pennsylvania
Other, age 51
Allegheny, Pennsylvania · implied b. ~1879 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | Mary |
| Relationship to Head | Mother |
| Sex | F |
| Color / Race | White |
| Age | 51 |
| Marital Status | Widowed |
| Birthplace | Scotland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1885 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Allegheny-County, Pennsylvania
Spouse, age 61
Allegheny-County, Pennsylvania · implied b. ~1879 — 9 household members
| Surname | McDermott |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Widowed |
| Birthplace | Scotland |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Naturalization Status | Naturalized |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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 61 · b. ~1879 · 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 — Allegheny-County, Pennsylvania
Open full size
1940 US Federal Census — Allegheny-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03661-00259)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Grace Gump | 30 | Daughter | — | Pennsylvania |
| 2 | Rose J. Bowman | 51 | Mother-in-law | — | Pennsylvania |
| 3 | Patrick Coyne | 52 | Head | Paver | Free State Ireland |
| 4 | Bridget Coyne | 53 | Wife | — | Ireland |
| 5 | Margaret A Coyne | 16 | Daughter | Paver | Pennsylvania |
| 6 | James F Byrne | 25 | Head | Automobile Fire Repairer | Pennsylvania |
| 7 | Mary K Byrne | 26 | Wife | — | Pennsylvania |
| 8 | Timothy J Byrne | 1 | Son | — | Pennsylvania |
| 9 | Mary Mcdermott THIS PERSON | 61 | Wife | — | Scotland |
| 10 | Mary T Mcdermott | 40 | Daughter | — | Pennsylvania |
| 11 | Bernice E Mcdermott | 29 | Daughter | Bookkeeper | Pennsylvania |
| 12 | Frances P Mcdermott | 26 | Daughter | Office Clerk | Pennsylvania |
| 13 | Joseph P Mcdermott | 23 | Son | Counterman | Pennsylvania |
| 14 | Regina C Mcdermott | 20 | Daughter | Office Clerk | Pennsylvania |
| 15 | Henry E Arenz | 73 | Head | Machinist | Germany |
| 16 | Carl Arenz | 34 | Son | Salesman | Pennsylvania |
| 17 | Agnes Watson | 30 | Head | — | Pennsylvania |
| 18 | Joseph J Kuenzig | 40 | Head | Manager | Pennsylvania |
| 19 | Edith Kuenzig | 40 | Wife | — | Pennsylvania |
| 20 | John Kuenzig | 19 | Son | — | Pennsylvania |
| 21 | Jeanne Kuenzig | 15 | Daughter | — | Pennsylvania |
| 22 | Robert Kuenzig | 11 | Son | — | Pennsylvania |
| 23 | Joan Kuenzig | 2 | Daughter | — | Pennsylvania |
| 24 | Joseph Wiwel | 49 | Head | Engraver | Pennsylvania |
| 25 | Catherine Wiwel | 46 | Wife | — | Pennsylvania |
| 26 | Catherine Wiwel | 18 | Daughter | — | Pennsylvania |
| 27 | James Flavin | 76 | Uncle | — | Ireland |
| 28 | Michael Driscoll | 51 | Head | Laborer | South Ireland |
| 29 | Nellie Driscoll | 49 | Wife | — | South Ireland |
| 30 | Mary E Driscoll | 18 | Daughter | — | Pennsylvania |
| 31 | Eileen Driscoll | 15 | Daughter | — | Pennsylvania |
| 32 | John Driscoll | 12 | Son | — | Pennsylvania |
| 33 | Sheila Sutton | 35 | Sister | Nurse (Trained) | South Ireland |
| 34 | Martin Wynkoop | 25 | Head | Shipper | Pennsylvania |
| 35 | Ethel Wynkoop | 26 | Wife | — | Pennsylvania |
| 36 | Robert W Woods | 57 | Head | Minister | Pennsylvania |
| 37 | Martha Woods | 56 | Wife | — | Pennsylvania |
| 38 | Catherine Woods | 29 | Daughter | Public Health Nurse | Pennsylvania |
| 39 | Daniel Cuppy | 69 | Head | Watchman | Free State Ireland |
| 40 | Bridget Cuppy | 65 | Wife | — | Free State Ireland |
Related Census Records
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)