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Margaret Mcmahon — 1940 US Census Record
Model Tree available1940 United States Federal Census · Hudson-County, New Jersey
Our Model Tree links this Margaret Mcmahon across the 1920, 1930 and 1940 US Censuses in Hudson-County, New Jersey (XGBoost, ~Confirmed), with identified parents J & James — first a daughter (b.~1912), then head of a 4-person household.
Age 28
b. ~1912
Female
Daughter
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hudson-County, New Jersey |
| Surname | McMahon |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | West New York Town |
| 1935 Residence (County) | Hudson |
| Additional Details | |
| Occupation | Stenographer |
| Industry | Steamship Co |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 2365 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Occupation | Stenographer |
| Township / Ward | West New York Town |
| Est. Birth Year | ~1912 |
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 Margaret | Age | Birth yr |
|---|---|---|---|---|
| Alice Mcmahon | Daughter | — | 22 | ~1918 |
| James Mcmahon | Head | — | 69 | ~1871 |
| Margaret Mcmahon | Daughter | — | 28 | ~1912 |
| James Mcmahon | Son | — | 24 | ~1916 |
Census Appearances
1920
Hudson, New …
Daughter, age 7
Hudson, New Jersey · implied b. ~1913 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Margaret |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Connecticut |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Hudson, New …
Daughter, age 18
Hudson, New Jersey · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Connecticut |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Hudson-County, New …
Daughter, age 28
Hudson-County, New Jersey · implied b. ~1912 — 4 household members
| Surname | McMahon |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | West New York Town |
| 1935 Residence (County) | Hudson |
| Occupation | Stenographer |
| Industry | Steamship Co |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 2365 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| 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 Margaret Mcmahon across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father J Mcmahon (~0.92 confidence) and father James Mcmahon (~0.92 confidence) and father James Mcmahon (~0.92 confidence) and mother Julia Mcmahon (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
J Mcmahon
b. ~1873
Source father
● Household
· direct · ~0.92
Father
James Mcmahon
b. ~1871
Source father
● Household
· direct · ~0.92
Father
James Mcmahon
b. ~1873
Source father
● Household
· direct · ~0.92
Mother
Julia Mcmahon
b. ~1876
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Margaret Mcmahon
Daughter · 1940 · age 28 · b. ~1912 · New Jersey
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Sibling
Alice Mcmahon
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Mcmahon
Sibling · 1940 · age 24
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 — Hudson-County, New Jersey
Open full size
1940 US Federal Census — Hudson-County, New Jersey
Page Contents
31 people indexed on this census page (nara:1940:m-t0627-02354-00735)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marie Hettig | 67 | Head | Winder | New Jersey |
| 2 | Margaret Hettig | 65 | Sister | Winder | New Jersey |
| 3 | Anna Hettig | 59 | Sister | — | New Jersey |
| 4 | Stephen Brenna | 54 | Head | Laborer | New Jersey |
| 5 | Annie Brenna | 54 | Wife | — | New Jersey |
| 6 | Robert Faurie | 28 | Lodger | Trucker | Louisiana |
| 7 | Clara P Faurie | 26 | Lodger | Saleswoman | Louisiana |
| 8 | Arno O Heidrich | 41 | Head | Electrician | Germany |
| 9 | Jennie Heidrich | 39 | Wife | — | Germany |
| 10 | Lorraine Heidrich | 10 | Daughter | — | New Jersey |
| 11 | Joseph Peter | 46 | Head | Elevator Operator | Italy |
| 12 | Caroline Peter | 40 | Wife | — | Italy |
| 13 | John Peter | 19 | Son | New Worker | New Jersey |
| 14 | Gerard Peter | 10 | Son | — | New Jersey |
| 15 | Marion Peter | 4 | Daughter | — | New Jersey |
| 16 | William E Mc Donald | 50 | Head | Foreman | New Jersey |
| 17 | Anna Mc Donald | 45 | Wife | — | Pennsylvania |
| 18 | Catherine Mc Donald | 19 | Daughter | Saleslady | New Jersey |
| 19 | William Mc Donald | 17 | Son | — | New Jersey |
| 20 | Raymond Mc Donald | 15 | Son | — | New Jersey |
| 21 | Anna Mc Donald | 13 | Daughter | — | New Jersey |
| 22 | John Mc Donald | 11 | Son | — | New Jersey |
| 23 | Dolores Mc Donald | 9 | Daughter | — | New Jersey |
| 24 | Anna Sweeney | 70 | Aunt | — | Eire |
| 25 | James Mcmahon | 69 | Head | — | Pennsylvania |
| 26 | Margaret Mcmahon THIS PERSON | 28 | Daughter | Stenographer | New Jersey |
| 27 | James Jr Mcmahon | 24 | Son | Carrier | New Jersey |
| 28 | Alice Mcmahon | 22 | Daughter | Stenographer | New Jersey |
| 29 | Rev Wm Dickmann | 48 | Head | — | Germany |
| 30 | Ruth Dickmann | 26 | Daughter | — | New York |
| 31 | Dorothea Dickmann | 24 | Daughter | Secretary | New York |
Pedigree Summary
Margaret + 2 siblings
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)