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Mary Mcmahon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, New Jersey
Our Model Tree links this Mary Mcmahon across the 1930 and 1940 US Censuses in Middlesex-County, New Jersey (XGBoost, ~Confirmed) — first a spouse (b.~1883), then head of a 9-person household.
Age 57
b. ~1883
Female
Spouse
Born: New Jersey
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, New Jersey |
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Woodbridge Village |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | G 5 |
| 1935 Residence | Same Place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Woodbridge Village |
| Est. Birth Year | ~1883 |
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 |
|---|---|---|---|---|
| Fanny Mcmahon | Daughter | — | 23 | ~1917 |
| Michael Mcmahon | Head | — | 62 | ~1878 |
| Robert Mcmahon | Son | — | 17 | ~1923 |
| William Mcmahon | Son | — | 28 | ~1912 |
| Douglas Mcmahon | Son | — | 20 | ~1920 |
| Gilbert Mcmahon | Son | — | 36 | ~1904 |
| John Mcmahon | Son | — | 25 | ~1915 |
| James Mcmahon | Son | — | 35 | ~1905 |
| Mary Mcmahon | Spouse | — | 57 | ~1883 |
Census Appearances
1930
Middlesex, New …
Spouse, age 46
Middlesex, New Jersey · implied b. ~1884 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Mary S |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | New Jersey |
| Age at First Marriage | 41 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Middlesex-County, New …
Spouse, age 57
Middlesex-County, New Jersey · implied b. ~1883 — 9 household members
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Woodbridge Village |
| 1935 Residence (County) | Middlesex |
| Highest Grade | G 5 |
| 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 Mary Mcmahon across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Mcmahon
Spouse · 1940 · age 57 · b. ~1883 · New Jersey
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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 — Middlesex-County, New Jersey
Open full size
1940 US Federal Census — Middlesex-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02364-00061)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Iris Borough | 13 | Daughter | — | New Jersey |
| 42 | Robert Borough | 10 | Son | — | New Jersey |
| 43 | Michael Mcmahon | 62 | Head | Fireman | New Jersey |
| 44 | Mary Mcmahon THIS PERSON | 57 | Wife | — | New Jersey |
| 45 | Gilbert Mcmahon | 36 | Son | Checker | New Jersey |
| 46 | James Mcmahon | 35 | Son | 80 | New Jersey |
| 47 | William Mcmahon | 28 | Son | 4 | New Jersey |
| 48 | John Mcmahon | 25 | Son | 0 | New Jersey |
| 49 | Fanny Mcmahon | 23 | Daughter | 0 | New Jersey |
| 50 | Douglas Mcmahon | 20 | Son | 0 | New Jersey |
| 51 | Robert Mcmahon | 17 | Son | — | New Jersey |
| 52 | Hebrews Or Mallerie | None | — | — | — |
| 53 | James Anderson | 37 | Head | 0 | New Jersey |
| 54 | Margaret Anderson | 38 | Wife | — | New Jersey |
| 55 | Marianne Anderson | 14 | Daughter | — | New Jersey |
| 56 | James Anderson | 9 | Son | — | New Jersey |
| 57 | Douglas Anderson | 6 | Son | — | New Jersey |
| 58 | John Fleming | 57 | Head | 0 | England |
| 59 | Daisy Fleming | 45 | Wife | — | England |
| 60 | John Fleming | 23 | Son | 0 | England |
| 61 | John Grant | 45 | Head | Metallurgist | Vermont |
| 62 | Ruth Grant | 40 | Wife | — | Ohio |
| 63 | Barbara Grant | 18 | Daughter | — | New York |
| 64 | John Grant | 13 | Son | — | New Jersey |
| 65 | Olaf Frederickson | 45 | Head | — | New Jersey |
| 66 | Mary Frederickson | 82 | Mother | — | Denmark |
| 67 | Arthur Talbot | 39 | Head | 0 | Minnesota |
| 68 | Eileen Talbot | 30 | Wife | — | Montana |
| 69 | Miguel Hassett | 31 | Head | Clerk | Austria |
| 70 | Mizzi Hassett | 27 | Wife | — | Germany |
| 71 | Edward Roche | 33 | Head | 0 | Maine |
| 72 | Edith Roche | 32 | Wife | — | Connecticut |
| 73 | Lois Roche | 14 | Daughter | — | Connecticut |
| 74 | Jane Roche | 7 | Daughter | — | Connecticut |
| 75 | Lee Roche | 5 | Son | — | Massachusetts |
| 76 | Carol Roche | 4 | Daughter | — | Connecticut |
| 77 | Conrad Steers | 49 | Head | Field Engineer | Germany |
| 78 | Elizabeth Steers | 47 | Wife | — | New York |
| 79 | Barbara Steers | 22 | Daughter | Beautician | New York |
| 80 | Richard Steers | 18 | Son | — | New York |
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)