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John Mahoney — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this John Mahoney across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1872), then head of a 5-person household.
Age 68
b. ~1872
Male
Head
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Mahoney |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 68 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Chief Engineer |
| Industry | Pumping Station |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 2600 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Chief Engineer |
| Township / Ward | Boston |
| Est. Birth Year | ~1872 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Lillian Fitzgerald | Daughter | — | 18 | ~1922 |
| Kathline Fitzgerald | Daughter | — | 15 | ~1925 |
| John Mahoney | Head | — | 68 | ~1872 |
| John Fitzgerald | Son | — | 22 | ~1918 |
| Charlotte Mahoney | Spouse | — | 45 | ~1895 |
Census Appearances
1920
Suffolk, Massachusetts
Head, age 50
Suffolk, Massachusetts · implied b. ~1870 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | John A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Lumber |
| Industry | Corp (mill) |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Head, age 58
Suffolk, Massachusetts · implied b. ~1872 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | John H |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Age at First Marriage | 29 |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | Engineer |
| Industry | Pump Station |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | 32.00 |
| Home Value / Rent | R |
| Veteran | R |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Head, age 68
Suffolk-County, Massachusetts · implied b. ~1872 — 5 household members
| Surname | Mahoney |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 68 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Occupation | Chief Engineer |
| Industry | Pumping Station |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 2600 |
| Highest Grade | H 4 |
| 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 John 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
John Mahoney
Head · 1940 · age 68 · b. ~1872 · 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 — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01665-00655)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Francis M. Ryan | 22 | Head | Time Keeper | Eire |
| 42 | Benjamin F. Ryan | 23 | Son | Time Keeper | Massachusetts |
| 43 | Charles Fianuoli | 35 | Head | Machinist | Italy |
| 44 | Josephine Fianuoli | 36 | Wife | Machine Oper. | Italy |
| 45 | John H. Mahoney THIS PERSON | 68 | Head | Chief Engineer | Massachusetts |
| 46 | Charlotte N. Mahoney | 45 | Wife | Train Matron | Maine |
| 47 | John N. Fitzgerald | 22 | Son | Laborer | Massachusetts |
| 48 | Lillian F. Fitzgerald | 18 | Daughter | — | Massachusetts |
| 49 | Kathline Fitzgerald | 15 | Daughter | — | Massachusetts |
| 50 | George Bagley | 57 | Head | Carpenter | Maine |
| 51 | Frances Bagley | 51 | Wife | — | Massachusetts |
| 52 | Frances Hardiman | 23 | Daughter | Waitress | Maine |
| 53 | Salvatore Bianciforti | 49 | Head | Truck Driver | Italy |
| 54 | Beatrice Bianciforti | 40 | Wife | — | Italy |
| 55 | Concetta Bianciforti | 15 | Daughter | — | Massachusetts |
| 56 | Rose Mary Bianciforti | 10 | Daughter | — | Massachusetts |
| 57 | Joseph Hurley | 53 | Head | Fireman | Massachusetts |
| 58 | Mary E. Hurley | 44 | Wife | — | Massachusetts |
| 59 | Francis J. Hurley | 10 | Son | — | Massachusetts |
| 60 | George Thorp | 31 | Head | Machinist | Massachusetts |
| 61 | Katherine Thorp | 37 | Wife | — | Canada English |
| 62 | Florence Thorp | 45 | Sister | — | Massachusetts |
| 63 | Katherine G. Walton | 55 | Head | Maid | Massachusetts |
| 64 | Emil Bellerive | 41 | Head | Carpenter | Canada French |
| 65 | Theresa Bellerive | 40 | Wife | — | Canada French |
| 66 | Loyola Bellerive | 17 | Daughter | — | Massachusetts |
| 67 | Catherine Bellerive | 13 | Daughter | — | Massachusetts |
| 68 | Robert Bellerive | 10 | Son | — | Massachusetts |
| 69 | Donald Brunton | 34 | Head | Mechanic | Massachusetts |
| 70 | Mary Brunton | 25 | Wife | Stenographer | Massachusetts |
| 71 | George Winfield | 58 | Head | Sheet Metal Worker | Massachusetts |
| 72 | Caroline Winfield | 57 | Sister | Linen Woman | Massachusetts |
| 73 | Leo J. Barry | 28 | Head | Bottler | Massachusetts |
| 74 | Ruth Barry | 28 | Wife | — | Massachusetts |
| 75 | Rosemary Barry | 2 | Daughter | — | Massachusetts |
| 76 | John H. Barry | 1 | Son | — | Massachusetts |
| 77 | William O'Connell | 52 | Head | Tonic Mixer | Massachusetts |
| 78 | Sarah O'Connell | 53 | Wife | — | Massachusetts |
| 79 | Mary E. O'Connell | 26 | Daughter | Office Clerk | Massachusetts |
| 80 | Eileen O'Connell | 23 | Daughter | Cashier | 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)