WM
William Mcmahon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Hudson-County, New Jersey
Our Model Tree links this William Mcmahon across the 1930 and 1940 US Censuses in Hudson-County, New Jersey (XGBoost, ~Confirmed) — first a son (b.~1930), then head of a 9-person household.
Age 10
b. ~1930
Male
Son
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hudson-County, New Jersey |
| Surname | McMahon |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Jersey City |
| 1935 Residence (County) | Hudson |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Same House |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Jersey City |
| 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 William | Age | Birth yr |
|---|---|---|---|---|
| Gloria Mcmahon | Daughter | — | 14 | ~1926 |
| John Mcmahon | Son | — | 20 | ~1920 |
| Gertrude Mcmahon | Spouse | — | 39 | ~1901 |
| Thomas Mcmahon | Son | — | 6 | ~1934 |
| Richard Mcmahon | Son | — | 11 | ~1929 |
| Walter Mcmahon | Son | — | 16 | ~1924 |
| William Mcmahon | Head | — | 40 | ~1900 |
| Constance Mcmahon | Daughter | — | 8 | ~1932 |
| William Mcmahon | Son | — | 10 | ~1930 |
Census Appearances
1930
Hudson, New …
Son, age
Hudson, New Jersey · implied b. ~1930 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Can Read/Write | No |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Hudson-County, New …
Son, age 10
Hudson-County, New Jersey · implied b. ~1930 — 9 household members
| Surname | McMahon |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Jersey City |
| 1935 Residence (County) | Hudson |
| Highest Grade | No 5 |
| 1935 Residence | Same House |
| 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 William Mcmahon across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Mcmahon
Son · 1940 · age 10 · b. ~1930 · New Jersey
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Sibling
Walter Mcmahon
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gloria Mcmahon
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Mcmahon
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mcmahon
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Mcmahon
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Constance Mcmahon
Sibling · 1940 · age 8
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
39 people indexed on this census page (nara:1940:m-t0627-02402-00357)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Berthamae Howell | 43 | Wife | — | Georgia |
| 2 | Mary Howell | 22 | Daughter | Housekeeper | Georgia |
| 3 | Preston Howell | 21 | Son | Freight Handler | Georgia |
| 4 | Lilly Howell | 13 | Daughter | — | Florida |
| 5 | Charles Howell | 11 | Son | — | New Jersey |
| 6 | Doris Howell | 9 | Daughter | — | New Jersey |
| 7 | Rhymie Howell | 6 | Son | — | New Jersey |
| 8 | William Mcmahon | 40 | Head | Machinist | New Jersey |
| 9 | Gertrude Mcmahon | 39 | Wife | — | New Jersey |
| 10 | John Mcmahon | 20 | Son | Bus Boy | New Jersey |
| 11 | Walter Mcmahon | 16 | Son | — | New Jersey |
| 12 | Gloria Mcmahon | 14 | Daughter | — | New Jersey |
| 13 | Richard Mcmahon | 11 | Son | — | New Jersey |
| 14 | William Mcmahon THIS PERSON | 10 | Son | — | New Jersey |
| 15 | Constance Mcmahon | 8 | Daughter | — | New Jersey |
| 16 | Thomas Mcmahon | 6 | Son | — | New Jersey |
| 17 | Michael Bacniasz | 27 | Head | Welder | New Jersey |
| 18 | Catherine Bacniasz | 21 | Wife | Shipping Dept | New Jersey |
| 19 | Jean Jozefowicz | 20 | Sister-in-law | Counter Girl | New Jersey |
| 20 | Stanley Worboshenki | 28 | Head | Shipping Clerk | New York |
| 21 | Lucille Worboshenki | 22 | Wife | Operator | New Jersey |
| 22 | Andrew Urbanek | 37 | Head | Machinist | Austria |
| 23 | Christina Urbanek | 36 | Wife | — | Austria |
| 24 | Mary Urbanek | 17 | Daughter | Packer | New York |
| 25 | Josephine Urbanek | 14 | Daughter | — | New Jersey |
| 26 | Julia Urbanek | 12 | Daughter | — | New Jersey |
| 27 | Andrew Jr Urbanek | 8 | Son | — | New Jersey |
| 28 | James Urbanek | 6 | Son | — | New Jersey |
| 29 | Michael Urbanek | 5 | Son | — | New Jersey |
| 30 | Stephen Muszynski | 54 | Head | — | Austria |
| 31 | Olga Muszynski | 18 | Daughter | Stenog. | New Jersey |
| 32 | Helen Muszynski | 16 | Daughter | — | New Jersey |
| 33 | William Cahill | 57 | Head | — | New Jersey |
| 34 | Elvira Cahill | 52 | Wife | — | New Jersey |
| 35 | Adam Slawinski | 32 | Head | Bak Builder | New Jersey |
| 36 | Anita Slawinski | 29 | Wife | Machine Oper. | Poland |
| 37 | Josephine Slawinski | 11 | Daughter | — | New Jersey |
| 38 | Anthony Slawinski | 9 | Son | — | New Jersey |
| 39 | Raymond Slawinski | 6 | Son | — | New Jersey |
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)