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Margaret Mahoney — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Margaret Mahoney across the 1910, 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Dennis & Patrick — first a daughter (b.~1905), then head of a 6-person household.
Age 35
b. ~1905
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Mahoney |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | File clerk |
| Industry | Telephone |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1467 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | File Clerk |
| Township / Ward | Boston |
| Est. Birth Year | ~1905 |
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 Margaret | Age | Birth yr |
|---|---|---|---|---|
| Julia Mahoney | Spouse | — | 69 | ~1871 |
| Mary Mahoney | Daughter | — | 31 | ~1909 |
| John Mahoney | Son | — | 26 | ~1914 |
| Jeremiah Mahoney | Son | — | 32 | ~1908 |
| Ellen Mahoney | Daughter | — | 27 | ~1913 |
| Margaret Mahoney | Daughter | — | 35 | ~1905 |
Census Appearances
1910
Suffolk, Massachusetts
Daughter, age 5
Suffolk, Massachusetts · implied b. ~1905 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Margaret T |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1920
Suffolk, Massachusetts
Daughter, age 16
Suffolk, Massachusetts · implied b. ~1904 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Daughter, age 25
Suffolk, Massachusetts · implied b. ~1905 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Operator |
| Industry | N E Tel & Tel |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 35
Suffolk-County, Massachusetts · implied b. ~1905 — 6 household members
| Surname | Mahoney |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Occupation | File clerk |
| Industry | Telephone |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1467 |
| 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 Margaret Mahoney across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Dennis Mahoney (~0.92 confidence) and father Patrick Mahoney (~0.92 confidence) and father Patrick Mahoney (~0.92 confidence) and mother Julia Mahoney (~0.92 confidence) and mother Mary Mahoney (~0.92 confidence) and mother Rose Mahoney (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Dennis Mahoney
b. ~1880
Source father
● Household
· direct · ~0.92
Father
Patrick Mahoney
b. ~1867
Source father
● Household
· direct · ~0.92
Father
Patrick Mahoney
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Julia Mahoney
b. ~1871
Source mother
● Household
· direct · ~0.92
Mother
Mary Mahoney
b. ~1882
Source mother
● Household
· direct · ~0.92
Mother
Rose Mahoney
b. ~1882
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Margaret Mahoney
Daughter · 1940 · age 35 · b. ~1905 · Massachusetts
★ You are viewing this record
Sibling
Jeremiah Mahoney
Sibling · 1940 · age 32
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ellen Mahoney
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mahoney
Sibling · 1940 · age 31
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mahoney
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
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-t0627-01670-00149)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Julia Mahoney | 69 | Wife | — | Ireland |
| 42 | Margaret Mahoney THIS PERSON | 35 | Daughter | File Clerk | Massachusetts |
| 43 | Jeremiah Mahoney | 32 | Son | Case Taker | Massachusetts |
| 44 | Mary Mahoney | 31 | Daughter | Representative | Massachusetts |
| 45 | Ellen Mahoney | 27 | Daughter | — | Massachusetts |
| 46 | John Mahoney | 26 | Son | — | Massachusetts |
| 47 | Hannah O'Brien | 55 | Head | Attendant | Ireland |
| 48 | Nellie | 62 | Sister | — | Ireland |
| 49 | William Washington | 55 | Head | Presser | California |
| 50 | Martha | 40 | Wife | — | Massachusetts |
| 51 | Bernice | 17 | Daughter | — | Massachusetts |
| 52 | Lucille | 15 | Daughter | — | Massachusetts |
| 53 | William Jr. | 13 | Son | — | Massachusetts |
| 54 | Evelyn | 11 | Daughter | — | Massachusetts |
| 55 | Jean | 10 | Daughter | — | Massachusetts |
| 56 | Louise | 7 | Daughter | — | Massachusetts |
| 57 | Clarence | 4 | Daughter | — | Massachusetts |
| 58 | — | None | — | — | — |
| 59 | Jacob Conn | 63 | Head | — | Russia |
| 60 | Sarah | 58 | Wife | — | Russia |
| 61 | Katie Barnett | 43 | Head | — | Massachusetts |
| 62 | Nathan | 18 | Son | — | New Jersey |
| 63 | Joseph | 16 | Son | Order Boy | New Jersey |
| 64 | Anna | 11 | Daughter | — | New Jersey |
| 65 | James L. Jackson | 46 | Head | Mechanic | Alabama |
| 66 | Mila | 44 | Wife | — | Georgia |
| 67 | Oswald E. Payne | 57 | Head | Janitor | Ohio |
| 68 | Mabel C. | 61 | Wife | House Keeper | Virginia |
| 69 | Elba Richardson | 44 | Lodger | Elevator Operator | Massachusetts |
| 70 | Walter J. Dorsey | 52 | Lodger | Mechanic | Maryland |
| 71 | David Tizernsky | 40 | Head | Battery Man | Massachusetts |
| 72 | Beatrice | 40 | Wife | — | Massachusetts |
| 73 | Walter Kane | 35 | Head | Automobile Mechanic | Poland |
| 74 | Mary | 29 | Wife | — | Massachusetts |
| 75 | James | 7 | Son | — | Massachusetts |
| 76 | Helen | 5 | Daughter | — | Massachusetts |
| 77 | Harry Weinberg | 59 | Head | — | Poland |
| 78 | Mary | 59 | Wife | — | Poland |
| 79 | John Alibrandi | 34 | Head | Cobbler | Italy |
Pedigree Summary
Margaret + 4 siblings
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)