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Mary Mcelroy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, New Jersey
Our Model Tree links this Mary Mcelroy across the 1930 and 1940 US Censuses in Essex-County, New Jersey (XGBoost, ~Confirmed) — first a daughter (b.~1925), then head of a 6-person household.
Age 15
b. ~1925
Female
Daughter
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, New Jersey |
| Surname | McElroy |
| Given Name | Mary Jane |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Denville |
| 1935 Residence (County) | Morris |
| Additional Details | |
| Highest Grade | Hs 1 |
| 1935 Residence | New Jersey |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | East Orange City |
| Est. Birth Year | ~1925 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Thomas Mcelroy | Son | — | 11 | ~1929 |
| Mary Mcelroy | Daughter | — | 15 | ~1925 |
| Bridget Mcelroy | Spouse | — | 42 | ~1898 |
| Thomas Mcelroy | Head | — | 44 | ~1896 |
| Zita Mcelroy | Daughter | — | 13 | ~1927 |
| Paul Mcelroy | Son | — | 9 | ~1931 |
Census Appearances
1930
Essex, New …
Daughter, age 5
Essex, New Jersey · implied b. ~1925 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McElroy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | Northern Ireland |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Essex-County, New …
Daughter, age 15
Essex-County, New Jersey · implied b. ~1925 — 6 household members
| Surname | McElroy |
| Given Name | Mary Jane |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Denville |
| 1935 Residence (County) | Morris |
| Highest Grade | Hs 1 |
| 1935 Residence | New Jersey |
| 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 Mcelroy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mcelroy
Daughter · 1940 · age 15 · b. ~1925 · New Jersey
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Sibling
Thomas Mcelroy
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Mcelroy
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Zita Mcelroy
Sibling · 1940 · age 13
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-t0627-02332-00430)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Bridget Vanderstreet | 62 | Head | — | New Jersey |
| 42 | Kathryn Vanderstreet | 28 | Daughter | Clerk | New Jersey |
| 43 | Edgar Vanderstreet | 22 | Son | Clerk | New Jersey |
| 44 | Margaret Vanderstreet | 20 | Daughter | Factory Helper | New Jersey |
| 45 | Walter Perry | 45 | Head | Bartender | New Jersey |
| 46 | Mary Pilkington | 34 | Cousin | Factory Help | New Jersey |
| 47 | Josephine Pilkington | 32 | Cousin | Clerk | New Jersey |
| 48 | George O. Schriek | 41 | Head | Inspector | New Jersey |
| 49 | Lilliam Schriek | 42 | Wife | — | New Jersey |
| 50 | Jeannette Schramm | 46 | In Law | Spooler | New Jersey |
| 51 | Jean R. Schramm | 21 | Niece | Clerk | New Jersey |
| 52 | Luigi Addonizio | 53 | Head | Foreman | Italy |
| 53 | Assunta Addonizio | 53 | Wife | — | Italy |
| 54 | Sam Addonizio | 30 | Son | Manager | New Jersey |
| 55 | Mario Addonizio | 29 | Son | Printer | New Jersey |
| 56 | Fred Addonizio | 27 | Son | Mechanic | New Jersey |
| 57 | Armond Addonizio | 26 | Son | Clerk | New Jersey |
| 58 | Edward Addonizio | 23 | Son | Tailor | New Jersey |
| 59 | Vincent Addonizio | 20 | Son | Clerk | New Jersey |
| 60 | Gloria Addonizio | 17 | Daughter | — | New Jersey |
| 61 | Edward Pellington | 38 | Head | Usher | New Jersey |
| 62 | Marie Pellington | 38 | Wife | — | New Jersey |
| 63 | Margaret Pellington | 14 | Daughter | — | New Jersey |
| 64 | Thomas Mcelroy | 44 | Head | Bartender | New Jersey |
| 65 | Bridget Mcelroy | 42 | Wife | — | New Jersey |
| 66 | Mary Jane Mcelroy THIS PERSON | 15 | Daughter | — | New Jersey |
| 67 | Zita Rose Mcelroy | 13 | Daughter | — | New Jersey |
| 68 | Thomas Mcelroy | 11 | Son | — | New Jersey |
| 69 | Paul Mcelroy | 9 | Son | — | New Jersey |
| 70 | Joseph Mangiaracina | 24 | Head | Clerk | New York |
| 71 | Anna Mangiaracina | 27 | Wife | — | New Jersey |
| 72 | Liborio Mangiaracina | 49 | Father | Tailor | Italy |
| 73 | Francis Mangiaracina | 43 | Mother | — | Italy |
| 74 | John Sheridan | 34 | Head | Clerk | New Jersey |
| 75 | Geraldine Sheridan | 29 | Wife | Bookkeeper | New Jersey |
| 76 | Jack Cavallo | 25 | Head | Gardener | New Jersey |
| 77 | Grace Cavallo | 23 | Wife | — | New Jersey |
| 78 | Frederick Roener | 52 | Father in Law | Mechanist | New Jersey |
| 79 | Vivian Roener | 25 | Sister in Law | Inspector | New Jersey |
| 80 | Michael Niccia | 26 | Head | Barber | 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)