WM
William Mahoney — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this William Mahoney across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1869), then head of a 4-person household.
Age 71
b. ~1869
Male
Head
Born: England
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Mahoney |
| Given Name | William J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 71 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Somerville city |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Signalman |
| Industry | Railroad |
| Class of Worker | PW |
| Income (1939) | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth Country | England |
| Birthplace (normalized) | england |
| Occupation | Signalman |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1869 |
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 |
|---|---|---|---|---|
| Alice Mahoney | Daughter | — | 32 | ~1908 |
| Hannah Mahoney | Spouse | — | 73 | ~1867 |
| William Mahoney | Son | — | 37 | ~1903 |
| William Mahoney | Head | — | 71 | ~1869 |
Census Appearances
1920
Middlesex, Massachusetts
Head, age 48
Middlesex, Massachusetts · implied b. ~1872 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | England |
| Year of Immigration | 1866 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Foreman |
| Industry | Knitting Mill |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth Country | England |
| Year of Naturalization | 1896 |
| Birthplace (normalized) | england |
1930
Middlesex, Massachusetts
Head, age 60
Middlesex, Massachusetts · implied b. ~1870 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | William J |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | England |
| Naturalization Status | Naturalized |
| Year of Immigration | 1871 |
| Age at First Marriage | 28 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | Signalman |
| Industry | Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 4000 |
| Radio Set | R |
| Birth Country | England |
| Birthplace (normalized) | england |
1940
Middlesex-County, Massachusetts
Head, age 71
Middlesex-County, Massachusetts · implied b. ~1869 — 4 household members
| Surname | Mahoney |
| Given Name | William J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 71 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Somerville city |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Naturalized |
| Occupation | Signalman |
| Industry | Railroad |
| Class of Worker | PW |
| Income (1939) | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth Country | England |
| Birthplace (normalized) | england |
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 71 · b. ~1869 · Massachusetts
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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, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01703-00737)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert E. Mckelvey | 35 | Head | Teacher | Massachusetts |
| 2 | Gladys B. Mckelvey | 31 | Wife | — | New York |
| 3 | Robert E. Mckelvey | 5 | Son | — | Massachusetts |
| 4 | Mary E. Mckelvey | 1 | Daughter | — | Massachusetts |
| 5 | Nora G. Mckelvey | 70 | Mother | Maid | Massachusetts |
| 6 | Mary E. Donovan | 70 | Aunt | Maid | Massachusetts |
| 7 | William J. Mahoney THIS PERSON | 71 | Head | Signalman | England |
| 8 | Hannah T. Mahoney | 73 | Wife | — | Massachusetts |
| 9 | William C. Mahoney | 37 | Son | Chief Mate | Massachusetts |
| 10 | Alice B. Mahoney | 32 | Daughter | Dental Hygienist | Massachusetts |
| 11 | William T. Wright | 70 | Head | Plumber | EIRE |
| 12 | Alice M. Wright | 68 | Wife | — | Canada-English |
| 13 | E. Lydia Macintyre | 74 | Head | — | Canada-English |
| 14 | Mary E. Macintyre | 34 | Daughter | — | Massachusetts |
| 15 | Michael J. Shields | 30 | Son-in-law | Projectionist | Massachusetts |
| 16 | Lydia A. Shields | 30 | Daughter | — | Massachusetts |
| 17 | Janet V. Hay | 76 | Head | — | Scotland |
| 18 | Donald G. Hay | 40 | Son | Type Painter | Massachusetts |
| 19 | Edward P. Dearborn | 72 | Head | Passenger Conductor | Maine |
| 20 | Janet L. Dearborn | 28 | Wife | — | Vermont |
| 21 | Guy T. Pasqualino | 27 | Head | Civil Engineer | Massachusetts |
| 22 | Anna E. Pasqualino | 28 | Wife | — | Massachusetts |
| 23 | James W. Boyd | 34 | Head | Attendant | Canada-English |
| 24 | Edna M. Boyd | 35 | Wife | — | Canada-English |
| 25 | John P. Boyd | 7 | Son | — | Massachusetts |
| 26 | Ronald J. Boyd | 4 | Son | — | Massachusetts |
| 27 | Dennis Sexton | 69 | Head | Laborer | EIRE |
| 28 | Mary V. Sexton | 70 | Wife | — | EIRE |
| 29 | Charles L. Spiers | 47 | Head | Chauffeur | Massachusetts |
| 30 | Mabel A. Spiers | 42 | Wife | — | Massachusetts |
| 31 | Edmund L. Spiers | 30 | Son | Laborer | Massachusetts |
| 32 | Barbara A. Spiers | 12 | Daughter | — | Massachusetts |
| 33 | Beatrice A. Spiers | 12 | Daughter | — | Massachusetts |
| 34 | Abigail Wood | 76 | Mother-in-law | — | Northern Ireland |
| 35 | Edward M. Pollard | 30 | Lodger | Printer | Massachusetts |
| 36 | Here Ends Block | None | 343 | — | — |
| 37 | Thomas E. Mont | 41 | Head | Teacher | Massachusetts |
| 38 | Agnes C. Mont | 41 | Wife | — | Massachusetts |
| 39 | Edward L. Mont | 19 | Son | New Worker | Massachusetts |
| 40 | Dorothy C. Mont | 16 | Daughter | — | Massachusetts |
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)