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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.~1895), then head of a 6-person household.
Age 45
b. ~1895
Female
Spouse
Born: Vermont
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Mahoney |
| Given Name | Mary I |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Vermont |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Vermont |
| Birth Country | United States |
| Birthplace (normalized) | vermont |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1895 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Dorothy Mahoney | Daughter | — | 12 | ~1928 |
| Louisa Mahoney | Daughter | — | 16 | ~1924 |
| Alfred Mahoney | Head | — | 49 | ~1891 |
| Francis Sutherland | Other | — | 21 | ~1919 |
| John Mahoney | Son | — | 13 | ~1927 |
| Mary Mahoney | Spouse | — | 45 | ~1895 |
Census Appearances
1920
Middlesex, Massachusetts
Spouse, age 25
Middlesex, Massachusetts · implied b. ~1895 — 2 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 | 25 |
| Marital Status | Married |
| Birthplace | Vermont |
| Father's Birthplace | Canada |
| Mother's Birthplace | Canada |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Vermont |
| Birth Country | United States |
| Birthplace (normalized) | vermont |
1930
Middlesex, Massachusetts
Other, age 35
Middlesex, Massachusetts · implied b. ~1895 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Mary I. |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Vermont |
| Age at First Marriage | 25 |
| Father's Birthplace | Canada English |
| Mother's Birthplace | Canada English |
| Can Read/Write | Yes |
| Birth State | Vermont |
| Birth Country | United States |
| Birthplace (normalized) | vermont |
1940
Middlesex-County, Massachusetts
Spouse, age 45
Middlesex-County, Massachusetts · implied b. ~1895 — 6 household members
| Surname | Mahoney |
| Given Name | Mary I |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Vermont |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Class of Worker | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Vermont |
| Birth Country | United States |
| Birthplace (normalized) | vermont |
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.
Show:
This person
Anchor record
Mary Mahoney
Spouse · 1940 · age 45 · b. ~1895 · 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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01704-00371)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Randolph Richardson | 30 | Son | Laborer | Massachusetts |
| 42 | Ellen A Richardson | 21 | Daughter | — | Massachusetts |
| 43 | George A Clark | 62 | Brother | — | Massachusetts |
| 44 | Frank C Mooney | 66 | Head | Custodian | Massachusetts |
| 45 | Bertha A Mooney | 64 | Wife | — | Erie |
| 46 | Mary O'Donnell | 8 | Daughter | — | Massachusetts |
| 47 | Bridget T Higgins | 56 | Lodger | Housework | Erie |
| 48 | Mary F Burns | 31 | Lodger | Nurse | Rhode Island |
| 50 | Albert S Moore | 76 | Head | Salesman | Maine |
| 51 | Annie M Moore | 74 | Wife | — | Canada |
| 52 | Alfred B Mahoney | 49 | Head | Executive Accountant | Massachusetts |
| 53 | Mary I Mahoney THIS PERSON | 45 | Wife | — | Vermont |
| 54 | Louisa A Mahoney | 16 | Daughter | — | Massachusetts |
| 55 | John A Mahoney | 13 | Son | — | Massachusetts |
| 56 | Dorothy I Mahoney | 12 | Daughter | — | Massachusetts |
| 57 | Francis Sutherland | 21 | Nephew | Laborer | Massachusetts |
| 58 | Nellie Appley | 53 | Head | — | Vermont |
| 59 | Oliver Appley | 51 | Son | Owner Fish Wholesale | Massachusetts |
| 60 | Charles F Mccarthy | 47 | Head | Plant Manager | Massachusetts |
| 61 | Irene M Mccarthy | 40 | Wife | — | Massachusetts |
| 62 | Marjorie I Mccarthy | 16 | Daughter | — | Massachusetts |
| 63 | Muriel Mccarthy | 11 | Daughter | — | Massachusetts |
| 64 | Maureen Mccarthy | 4 | Daughter | — | Massachusetts |
| 65 | Charles C Jamum|Jannum | 61 | Head | Driver | Massachusetts |
| 66 | Daisy B Jamum|Jannum | 66 | Sister | — | New Hampshire |
| 67 | Grace B Jamum|Jannum | 64 | Sister | — | Massachusetts |
| 68 | Warren B Jamum|Jannum | 55 | Brother | — | Massachusetts |
| 69 | Richard H Goode | 56 | Head | Salesman | Massachusetts |
| 70 | Lillian M Goode | 46 | Wife | — | Massachusetts |
| 71 | John R Goode | 9 | Son | — | Massachusetts |
| 72 | Hawkes Alfred Goode | 18 | Son | — | Massachusetts |
| 73 | Joseph Oliveri | 28 | Head | Assembler | Massachusetts |
| 74 | Cecilia Oliveri | 22 | Wife | — | Massachusetts |
| 75 | Stephen Duffy | 50 | Head | Clerk | Canada |
| 76 | Dorothy E Duffy | 45 | Wife | — | England |
| 77 | Mary R Duffy | 21 | Daughter | Comptometer Operator | Massachusetts |
| 78 | Dorothy I Duffy | 17 | Daughter | — | Massachusetts |
| 79 | Kathryn T Duffy | 13 | Daughter | — | Massachusetts |
| 80 | Joseph E Duffy | 11 | Son | — | 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)