WM
William Mahoney — 1940 US Census Record
Linked across censuses1940 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) — first a head (b.~1877), then head of a 4-person household.
Age 63
b. ~1877
Male
Head
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Kings-County, New York |
| Surname | Mahoney |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Boro of Brooklyn |
| 1935 Residence (County) | Kings |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Lieutenant |
| Industry | Police Dept. |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 4000 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Lieutenant |
| Township / Ward | Boro Of Brooklyn |
| Est. Birth Year | ~1877 |
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 |
|---|---|---|---|---|
| Sadie Mahoney | Spouse | — | 54 | ~1886 |
| Arthur Mahoney | Son | — | 21 | ~1919 |
| Billie Mahoney | Son | — | 19 | ~1921 |
| William Mahoney | Head | — | 63 | ~1877 |
Census Appearances
1920
Kings, New …
Head, age 44
Kings, New York · implied b. ~1876 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | William H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Ireland |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Salesman |
| Industry | Groceries |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth Country | Ireland |
| Year of Naturalization | 1914 |
| Birthplace (normalized) | ireland |
1930
Kings, New …
Head, age 55
Kings, New York · implied b. ~1875 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1900 |
| Age at First Marriage | 30 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Home Value / Rent | 50 |
| Radio Set | R |
| Veteran | No |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Kings-County, New …
Head, age 63
Kings-County, New York · implied b. ~1877 — 4 household members
| Surname | Mahoney |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Boro of Brooklyn |
| 1935 Residence (County) | Kings |
| Naturalization Status | Naturalized |
| Occupation | Lieutenant |
| Industry | Police Dept. |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 4000 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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.
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This person
Anchor record
William Mahoney
Head · 1940 · age 63 · b. ~1877 · New York
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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 — 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-t0627-02615-00904)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Anton Kondratovitch | 52 | Head | — | Lithuania |
| 42 | Anna Kondratovitch | 40 | Wife | Presser | Lithuania |
| 43 | Anthony Jr. Kondratovitch | 14 | Son | — | New York |
| 44 | Albert Kondratovitch | 10 | Son | — | New York |
| 45 | George Rogers | 70 | Lodger | — | New York |
| 46 | Louis Bernstein | 54 | Head | Contractor | Poland |
| 47 | Eva Bernstein | 52 | Wife | — | Poland |
| 48 | Jack Bernstein | 21 | Son | — | New York |
| 49 | Joseph Chukowsky | 52 | Head | — | Poland |
| 50 | Bee Chukowsky | 51 | Wife | — | Poland |
| 51 | Sophie Chukowsky | 28 | Daughter | Bookkeeper | Poland |
| 52 | Irene Chukowsky | 22 | Daughter | Bookkeeper | New York |
| 53 | William Mahoney THIS PERSON | 63 | Head | Lieutenant | Ireland |
| 54 | Sadie Mahoney | 54 | Wife | — | New York |
| 55 | Arthur Mahoney | 21 | Son | — | New York |
| 56 | Billie Mahoney | 19 | Son | — | New York |
| 57 | Francis Hasting | 70 | Head | — | New York |
| 58 | Philip Hasting | 42 | Son | Chemical Engineer | New York |
| 59 | Carolyn Namsley | 52 | Head | — | New York |
| 60 | Theodore Anglus | 45 | Brother | Office | New Jersey |
| 61 | Catherine Rudenko | 64 | Mother | — | New York |
| 62 | George Phillips | 45 | Head | — | New York |
| 63 | Loretta Phillips | 43 | Wife | — | New York |
| 64 | Emma Unsed | 73 | Mother in law | — | New York |
| 65 | Albert M. Eckert | 68 | Head | Elevator Operator | New York |
| 66 | Katherine Eckert | 67 | Wife | — | New York |
| 67 | Robert Gedney | 47 | Head | Manager | New York |
| 68 | Ella Gedney | 46 | Wife | — | New York |
| 69 | Ella Mae Gedney | 20 | Daughter | Office | New York |
| 70 | Dorothy Gedney | 18 | Daughter | Stenographer | New York |
| 71 | Robert Jr. Gedney | 10 | Son | — | New York |
| 72 | Viola Gedney | 49 | Head | Asst. Supt. | New York |
| 73 | Herbert Beck | 43 | Head | — | New York |
| 74 | Florence Beck | 37 | Wife | — | New York |
| 75 | Madelyn Beck | 12 | Daughter | — | New York |
| 76 | Florence Jr. Beck | 8 | Daughter | — | New York |
| 77 | Lena Beck | 79 | Mother | — | New York |
| 78 | Howard Kraus | 33 | Head | Desk Man | New York |
| 79 | Anna Kraus | 33 | Wife | — | New York |
| 80 | Howard Jr. Kraus | 12 | 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)