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Mary Mahoney — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Mahoney across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1892), then head of a 7-person household.
Age 48
b. ~1892
Female
Spouse
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Mahoney |
| Given Name | Mary D. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Everett City |
| Est. Birth Year | ~1892 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Geraldine Mahoney | Daughter | — | 18 | ~1922 |
| Elaine Stevens | Daughter | — | 3 | ~1937 |
| Coral Stevens | Daughter | — | 5 | ~1935 |
| Dorothy Stevens | Daughter | — | 21 | ~1919 |
| William Mahoney | Head | — | 49 | ~1891 |
| Susan Mckenna | Other | — | 83 | ~1857 |
| Mary Mahoney | Spouse | — | 48 | ~1892 |
Census Appearances
1920
Middlesex, Massachusetts
Spouse, age 28
Middlesex, Massachusetts · implied b. ~1892 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Mary D. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Other, age 36
Middlesex, Massachusetts · implied b. ~1894 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Mary D |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Age at First Marriage | 19 |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Spouse, age 48
Middlesex-County, Massachusetts · implied b. ~1892 — 7 household members
| Surname | Mahoney |
| Given Name | Mary D. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville |
| 1935 Residence (County) | Middlesex |
| Class of Worker | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Massachusetts |
| 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 Mary 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
Mary Mahoney
Spouse · 1940 · age 48 · b. ~1892 · 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-t0627-01605-00203)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ralph D. Phinney | 42 | Head | Mail Man | Massachusetts |
| 2 | Annie E. Phinney | 41 | Wife | — | Massachusetts |
| 3 | Ester R. Phinney | 18 | Daughter | Stenographer | Massachusetts |
| 4 | Douglas R. Phinney | 11 | Son | — | Massachusetts |
| 5 | Ralph D. Jr. Phinney | 4 | Son | — | Massachusetts |
| 6 | William J. Mahoney | 49 | Head | Timekeeper | Massachusetts |
| 7 | Mary D. Mahoney THIS PERSON | 48 | Wife | — | Massachusetts |
| 8 | Geraldine M. Mahoney | 18 | Daughter | Artist | Massachusetts |
| 9 | Dorothy A. Stevens | 21 | Daughter | — | Massachusetts |
| 10 | Coral E. Stevens | 5 | Daughter | — | Massachusetts |
| 11 | Elaine M. Stevens | 3 | Daughter | — | Massachusetts |
| 12 | Susan A. Mckenna | 83 | Mother in law | — | Massachusetts |
| 13 | William S. Mccarthy | 23 | Head | Shipper | Massachusetts |
| 14 | Mary E. Mccarthy | 23 | Wife | — | Massachusetts |
| 15 | Patricia A. Mccarthy | 3 | Daughter | — | Massachusetts |
| 16 | Thomas J. Mccarthy | 53 | Father | Edge Setter | Massachusetts |
| 17 | Herbert Baker | 60 | Head | Rigger | Newfoundland |
| 18 | Gertrude M. Baker | 48 | Wife | — | Newfoundland |
| 19 | Harold A. Baker | 26 | Son | New Worker | Massachusetts |
| 20 | Dorothy A. Baker | 24 | Daughter | Machine Operator | Massachusetts |
| 21 | Raymond A. Baker | 22 | Son | Mechanic | Massachusetts |
| 22 | Florence M. Baker | 20 | Daughter | Stenographer | Massachusetts |
| 23 | Ruth L. Baker | 16 | Daughter | — | Massachusetts |
| 24 | Warren C. Baker | 14 | Son | — | Massachusetts |
| 25 | Velmer F. Baker | 9 | Daughter | — | Massachusetts |
| 26 | Harold Rood | 46 | Head | Electrician | Massachusetts |
| 27 | Helen M. Rood | 36 | Wife | — | Massachusetts |
| 28 | Marion C. Rood | 4 | Daughter | — | Massachusetts |
| 29 | Josephine Rood | 78 | Head | — | Norway |
| 30 | Helen Rood Parker | 48 | Daughter | Clerk | New York |
| 31 | Lawrence R. Parker | 16 | Son in law | — | Massachusetts |
| 32 | Clara G. Rood | 42 | Daughter | Clerk | Massachusetts |
| 33 | Phillip Spillane | 39 | Head | Carpenter | Ireland |
| 34 | Rose J. Spillane | 40 | Wife | — | Ireland |
| 35 | Patrick J. Mcateer | 37 | Brother in law | Shipper | Ireland |
| 36 | Phillip J. Spillane | 9 | Son | — | Massachusetts |
| 37 | John Spillane | 8 | Son | — | Massachusetts |
| 38 | Joseph Spillane | 6 | Son | — | Massachusetts |
| 39 | Alphonse Touchette | 53 | Head | Shipper | Canada |
| 40 | Aedea Touchette | 53 | Wife | — | Canada |
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)