WM
William Mahoney — 1940 US Census Record
Model Tree available1940 United States Federal Census · Kings-County, New York
Our Model Tree links this William Mahoney across the 1920, 1930 and 1940 US Censuses in Kings-County, New York (XGBoost, ~Confirmed), with identified parents John & Bridget — first a son (b.~1919), then head of a 4-person household.
Age 21
b. ~1919
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Kings-County, New York |
| Surname | Mahoney |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Additional Details | |
| Occupation | Messenger |
| Industry | Post Office |
| Class of Worker | GW |
| Hours Worked | 16 |
| Income (1939) | 585 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Messenger |
| Township / Ward | New York City |
| Est. Birth Year | ~1919 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Walter Mahoney | Son | — | 14 | ~1926 |
| Bridget Mahoney | Spouse | — | 82 | ~1858 |
| William Mahoney | Son | — | 21 | ~1919 |
| John Mahoney | Head | — | 83 | ~1857 |
Census Appearances
1920
Kings, New …
Son, age
Kings, New York · implied b. ~1920 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Occupation | none |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Kings, New …
Son, age 11
Kings, New York · implied b. ~1919 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Kings-County, New …
Son, age 21
Kings-County, New York · implied b. ~1919 — 4 household members
| Surname | Mahoney |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Occupation | Messenger |
| Industry | Post Office |
| Class of Worker | GW |
| Hours Worked | 16 |
| Income (1939) | 585 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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 Mahoney across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Mahoney (~0.92 confidence) and mother Bridget Mahoney (~0.92 confidence) and father Lester Mahoney (~0.92 confidence) and father James Mahoney (~0.92 confidence) and mother Madeline Mahoney (~0.92 confidence) and mother Mary Mahoney (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Mahoney
b. ~1857
Source father
● Household
· direct · ~0.92
Mother
Bridget Mahoney
b. ~1858
Source mother
● Household
· direct · ~0.92
Father
Lester Mahoney
b. ~1881
Source father
● Household
· direct · ~0.92
Father
James Mahoney
b. ~1884
Source father
● Household
· direct · ~0.92
Mother
Madeline Mahoney
b. ~1884
Source mother
● Household
· direct · ~0.92
Mother
Mary Mahoney
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Mahoney
Son · 1940 · age 21 · b. ~1919 · New York
★ You are viewing this record
Sibling
Walter Mahoney
Sibling · 1940 · age 14
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 — Kings-County, New York
Open full size
1940 US Federal Census — Kings-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02547-00928)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John M. Ahearne | 35 | Head | Salesman | New York |
| 42 | James Ahearne | 37 | Head | Salesman | New York |
| 43 | Rita Ahearne | 34 | Wife | — | New York |
| 44 | Patricia Ahearne | 10 | Daughter | — | New York |
| 45 | James Ahearne | 8 | Son | — | New York |
| 46 | Dorothy Ahearne | 5 | Daughter | — | New York |
| 47 | Patrick J. Black | 38 | Head | Oiler | New York |
| 48 | Elizabeth Black | 39 | Wife | — | New York |
| 49 | Elizabeth Black | 12 | Daughter | — | New York |
| 50 | John Black | 9 | Son | — | New York |
| 51 | John Mahoney | 83 | Head | — | New York |
| 52 | Bridget Mahoney | 82 | Wife | — | Free State |
| 53 | William Mahoney THIS PERSON | 21 | Son | Messenger | New York |
| 54 | Walter Mahoney | 14 | Son | — | New York |
| 55 | Louis Amitrano | 49 | Head | Porter | New York |
| 56 | Mary Amitrano | 40 | Wife | — | New York |
| 57 | Henry George | 40 | Head | Printer | New York |
| 58 | Catherine George | 34 | Wife | — | New York |
| 59 | Patricia George | 11 | Daughter | — | New York |
| 60 | Dorothy George | 9 | Daughter | — | New York |
| 61 | Henry George | 6 | Son | — | New York |
| 62 | Edward Dowling | 66 | Head | Shipping Clerk | New York |
| 63 | Mary Dowling | 63 | Sister | — | New York |
| 64 | Michael Dowling | 61 | Brother | Foreman | New York |
| 65 | Veronica Dowling | 26 | Niece | Stenographer | New York |
| 66 | Alfred Dowling | 46 | Nephew | Clerk | New York |
| 67 | Amadeo Farrea | 41 | Head | Barber | Porto Rico |
| 68 | Alfred Capre | 41 | Head | — | Porto Rico |
| 69 | Louis Capre | 36 | Wife | — | Porto Rico |
| 70 | Ralph Capre | 11 | Son | Collector | Porto Rico |
| 71 | Harry O'Rourke | 36 | Head | — | New York |
| 72 | Rose O'Rourke | 34 | Wife | — | New York |
| 73 | Rosanne O'Rourke | 8 | Daughter | — | New York |
| 74 | Margaret O'Rourke | 5 | Son | — | New York |
| 75 | Henry O'Rourke | 2 | Son | — | New York |
| 76 | Leone Vito | 37 | Head | Mechanic | Italy |
| 77 | Mary Vito | 30 | Wife | — | Italy |
| 78 | Salvatore Vito | 11 | Son | — | New York |
| 79 | Josephine Vito | 6 | Daughter | — | New York |
| 80 | Leone Vito | 1 | Son | — | New York |
Pedigree Summary
William + 1 sibling
Gen 1 · 6 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)