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Mary Mcdermott — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, New Jersey
Our Model Tree links this Mary Mcdermott across the 1930 and 1940 US Censuses in Essex-County, New Jersey (XGBoost, ~Confirmed) — first a daughter (b.~1930), then head of a 9-person household.
Age 10
b. ~1930
Female
Daughter
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, New Jersey |
| Surname | McDermott |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Belleville Town |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Highest Grade | No 3 |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Belleville Town |
| Est. Birth Year | ~1930 |
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 |
|---|---|---|---|---|
| Sarah Mcdermott | Daughter | — | 11 | ~1929 |
| Grace Mcdermott | Daughter | — | 1 | ~1939 |
| Florence Mcdermott | Daughter | — | 4 | ~1936 |
| Mary Mcdermott | Daughter | — | 10 | ~1930 |
| Edward Mcdermott | Head | — | 36 | ~1904 |
| Joseph Mcdermott | Son | — | 2 | ~1938 |
| Thomas Mcdermott | Son | — | 6 | ~1934 |
| Edward Mcdermott | Son | — | 8 | ~1932 |
| Helen Mcdermott | Spouse | — | 35 | ~1905 |
Census Appearances
1930
Essex, New …
Daughter, age
Essex, New Jersey · implied b. ~1930 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Essex-County, New …
Daughter, age 10
Essex-County, New Jersey · implied b. ~1930 — 9 household members
| Surname | McDermott |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Belleville Town |
| 1935 Residence (County) | Essex |
| Highest Grade | No 3 |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mcdermott
Daughter · 1940 · age 10 · b. ~1930 · New Jersey
★ You are viewing this record
Sibling
Grace Mcdermott
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Florence Mcdermott
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Mcdermott
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Mcdermott
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Mcdermott
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sarah Mcdermott
Sibling · 1940 · age 11
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 — Essex-County, New Jersey
Open full size
1940 US Federal Census — Essex-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02328-00252)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert H. Roach | 27 | Head | Electric Welder | Pennsylvania |
| 2 | Bernice D. Roach | 27 | Wife | — | Pennsylvania |
| 3 | Robert L. Roach | 3 | Son | — | New Jersey |
| 4 | Viola Oldham | 39 | Head | Elastic Specialty Co | New Jersey |
| 5 | John A. Oldham | 17 | Son | Wire Cloth Factory | New Jersey |
| 6 | Joseph Oldham | 38 | Brother-in-law | Fire Department | New Jersey |
| 7 | Francis Rhodes | 58 | Mother | — | New York |
| 8 | John Marrone | 56 | Head | Machine Operator | Italy |
| 9 | Pasqualina Marrone | 58 | Wife | — | Italy |
| 10 | Anthony Marrone | 21 | Son | New Worker | Italy |
| 11 | Guido Cartone | 33 | Head | Cement Worker | Mexico |
| 12 | Mary Cartone | 28 | Wife | — | Italy |
| 13 | Louis Cartone | 6 | Son | — | New Jersey |
| 14 | Jeremiah Heon | 38 | Head | Labor-Foreman | Massachusetts |
| 15 | Christina Heon | 36 | Wife | — | Scotland |
| 16 | Joseph Heon | 4 | Son | — | New Jersey |
| 17 | Christina Heon | 2 | Daughter | — | New Jersey |
| 18 | Florence Yingling | 40 | Head | — | New Jersey |
| 19 | James Yingling | 18 | Son | File Maker | Pennsylvania |
| 20 | Samuel Oldham | 71 | Head | — | New Jersey |
| 21 | Mary Oldham | 61 | Wife | — | New Jersey |
| 22 | William Oldham | 23 | Son | Wire Cloth Factory | New Jersey |
| 23 | Clarence Anderson | 53 | Head | Building Contractor | New Jersey |
| 24 | Mary Jane Anderson | 47 | Wife | — | Pennsylvania |
| 25 | August Kessler | 58 | Head | Grocery Factory | New York |
| 26 | Annie Kessler | 56 | Wife | Steel Mill | New Jersey |
| 27 | Edward Mcdermott | 36 | Head | Building Contractor | New Jersey |
| 28 | Helen Mcdermott | 35 | Wife | — | New Jersey |
| 29 | Sarah Mcdermott | 11 | Daughter | — | New Jersey |
| 30 | Mary Mcdermott THIS PERSON | 10 | Daughter | — | New Jersey |
| 31 | Edward Mcdermott | 8 | Son | — | New Jersey |
| 32 | Thomas Mcdermott | 6 | Son | — | New Jersey |
| 33 | Florence Mcdermott | 4 | Daughter | — | New Jersey |
| 34 | Joseph Mcdermott | 2 | Son | — | New Jersey |
| 35 | Grace Mcdermott | 1 | Daughter | — | New Jersey |
| 36 | Russell Maclachlan | 35 | Head | Coater | Canada |
| 37 | Jennie Maclachlan | 33 | Wife | — | New Jersey |
| 38 | Betty Jean Maclachlan | 10 | Daughter | — | New Jersey |
| 39 | Shirley Ann Maclachlan | 5 | Daughter | — | New Jersey |
| 40 | Lester A. Maclachlan | 3 | Son | — | New Jersey |
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)