WM
William Mahoney — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this William Mahoney across the 1910, 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Julia & Elizabeth — first a son (b.~1909), then head of a 3-person household.
Age 31
b. ~1909
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Mahoney |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City |
| Est. Birth Year | ~1909 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Julia Mahoney | Spouse | — | 73 | ~1867 |
| William Mahoney | Son | — | 31 | ~1909 |
| Daniel Mahoney | Head | — | 64 | ~1876 |
Census Appearances
1910
Suffolk, Massachusetts
Son, age
Suffolk, Massachusetts · implied b. ~1910 — 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 | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1920
Suffolk, Massachusetts
Son, age 10
Suffolk, Massachusetts · implied b. ~1910 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | William |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Son, age 21
Suffolk, Massachusetts · implied b. ~1909 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Age at First Marriage | 21 |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Bus Boy |
| Industry | Hospital |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 31
Suffolk-County, Massachusetts · implied b. ~1909 — 3 household members
| Surname | Mahoney |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Julia Mahoney (~0.92 confidence) and mother Elizabeth Mahoney (~0.92 confidence) and father Daniel Mahoney (~0.92 confidence) and father Louis Mahoney (~0.92 confidence) and father Daniel 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
Mother
Julia Mahoney
b. ~1867
Source mother
● Household
· direct · ~0.92
Mother
Elizabeth Mahoney
b. ~1870
Source mother
● Household
· direct · ~0.92
Father
Daniel Mahoney
b. ~1874
Source father
● Household
· direct · ~0.92
Father
Louis Mahoney
b. ~1875
Source father
● Household
· direct · ~0.92
Father
Daniel Mahoney
b. ~1876
Source father
● Household
· direct · ~0.92
Mother
Mary Mahoney
b. ~1876
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Mahoney
Son · 1940 · age 31 · b. ~1909 · Massachusetts
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01666-00272)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Cheney L. Clarke | 26 | Son | Glazier | Connecticut |
| 2 | Raymond Clarke | 22 | Son | Attendant | Massachusetts |
| 4 | Joseph Tempesta | 41 | Head | Barber | Italy |
| 5 | Mary Tempesta | 29 | Wife | — | New York |
| 6 | Theresa Tempesta | 10 | Daughter | — | Massachusetts |
| 7 | Mary Tempesta | 5 | Daughter | — | Massachusetts |
| 8 | Frank Tempesta | 83 | Father | — | Italy |
| 9 | Theresa Tempesta | 78 | Mother | — | Italy |
| 10 | James H. Walker | 81 | Head | Janitor | Virginia |
| 11 | Annie Walker | 73 | Wife | — | Canada-English |
| 12 | James Bovill | 44 | Head | Painter | British West Indies |
| 13 | Cassie Bovill | 32 | Wife | — | Jamaica |
| 14 | Edward Collins | 73 | Head | — | New York |
| 15 | Beryl Collins | 37 | Daughter | — | Massachusetts |
| 16 | Daniel M. Mahoney | 64 | Head | Fireman | Massachusetts |
| 17 | Julia M. Mahoney | 73 | Wife | — | Massachusetts |
| 18 | William J. Mahoney THIS PERSON | 31 | Son | — | Massachusetts |
| 19 | Julia J. O'Brien | 40 | Head | Kitchen Helper | New York State |
| 20 | Mary Comisky | 49 | Head | Chambermaid | Canada-French |
| 21 | George W. Comisky | 18 | Son | Helper | Massachusetts |
| 22 | Joseph P. Desjardins | 46 | Head | Painter | Canada-French |
| 23 | Amel Desjardins | 46 | Wife | — | Canada-French |
| 24 | George A. Cole | 24 | Head | Grinder | Wisconsin |
| 25 | Cecilia G. Cole | 24 | Wife | — | Massachusetts |
| 26 | Charlotte Cole | 4 | Daughter | — | Massachusetts |
| 27 | Roberta Cole | 3 | Daughter | — | Massachusetts |
| 28 | George A. Jr. Cole | 0 | Son | — | Massachusetts |
| 29 | Henrietta Bryan | 51 | Head | — | Massachusetts |
| 30 | Manuel T. Bryan | 12 | Son | — | Massachusetts |
| 31 | Mary C. Morrison | 65 | Head | Housekeeper | South Carolina |
| 32 | Rachel L. Morrison | 31 | Son | Housekeeper | Georgia |
| 33 | Josephine Lucier | 51 | Head | Seamstress | Massachusetts |
| 34 | Irene Lucier | 29 | Daughter | House Cleaning | Massachusetts |
| 35 | Hercules Lucier | 10 | Son | — | Massachusetts |
| 36 | Mary G. Woolfolk | 47 | Head | Homeworker | North Carolina |
| 37 | Julia F. Woolfolk | 19 | Daughter | Homeworker | D.C. |
| 38 | William Woolfolk | 17 | Son | — | D.C. |
| 39 | Joseph E. Edwards | 21 | Head | Laborer | Massachusetts |
| 40 | Helen L. Edwards | 20 | Wife | — | Massachusetts |
Pedigree Summary
William
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)