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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 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Jeremiah & John — first a daughter (b.~1912), then head of a 4-person household.
Age 28
b. ~1912
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Mahoney |
| Given Name | Margaret E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Stenographer |
| Industry | Insurance Office |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1040 |
| Highest Grade | H 4 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Stenographer |
| Township / Ward | Boston City |
| Est. Birth Year | ~1912 |
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 Margaret | Age | Birth yr |
|---|---|---|---|---|
| Mary Mahoney | Spouse | — | 52 | ~1888 |
| Gerard Mahoney | Son | — | 24 | ~1916 |
| John Mahoney | Head | — | 61 | ~1879 |
| Margaret Mahoney | Daughter | — | 28 | ~1912 |
Census Appearances
1920
Suffolk, Massachusetts
Daughter, age 8
Suffolk, Massachusetts · implied b. ~1912 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Margaret |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| 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
Suffolk, Massachusetts
Daughter, age 19
Suffolk, Massachusetts · implied b. ~1911 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Margaret A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Occupation | Stenographer |
| Industry | Insurance |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 28
Suffolk-County, Massachusetts · implied b. ~1912 — 4 household members
| Surname | Mahoney |
| Given Name | Margaret E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Occupation | Stenographer |
| Industry | Insurance Office |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1040 |
| Highest Grade | H 4 |
| 1935 Residence | Same house |
| 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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Jeremiah Mahoney (~0.92 confidence) and father John Mahoney (~0.92 confidence) and father John Mahoney (~0.92 confidence) and mother Margaret Mahoney (~0.92 confidence) and mother Mary Mahoney (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Jeremiah Mahoney
b. ~1866
Source father
● Household
· direct · ~0.92
Father
John Mahoney
b. ~1879
Source father
● Household
· direct · ~0.92
Father
John Mahoney
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
Margaret Mahoney
b. ~1876
Source mother
● Household
· direct · ~0.92
Mother
Mary Mahoney
b. ~1888
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Margaret Mahoney
Daughter · 1940 · age 28 · b. ~1912 · Massachusetts
★ You are viewing this record
Sibling
Gerard Mahoney
Sibling · 1940 · age 24
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
40 people indexed on this census page (nara:1940:m-t0627-01679-00483)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Shaheen | 34 | Head | Electrician | Massachusetts |
| 2 | Ruth Shaheen | 23 | Wife | — | Maine |
| 3 | Verna Shaheen | 2 | Daughter | 0 | Massachusetts |
| 4 | Vivian Shaheen | 0 | Daughter | — | Massachusetts |
| 5 | John F. Holmes | 48 | Head | Clerk | Massachusetts |
| 6 | Margaret T. Holmes | 45 | Wife | — | Canada |
| 7 | Romaine Holmes | 17 | Daughter | — | Massachusetts |
| 8 | Francis Holmes | 14 | Son | — | Massachusetts |
| 9 | Carol Holmes | 2 | Daughter | — | Massachusetts |
| 10 | Harry J. Grover | 65 | Head | Conductor | Vermont |
| 11 | Minnie G. Grover | 65 | Wife | — | Massachusetts |
| 12 | Paul F. Ab Byther | 26 | Step-son | Instructor | Massachusetts |
| 13 | Savin G|Irving G Friedman | 56 | Head | Machinist'S Helper | Hungary |
| 14 | Esther Friedman | 56 | Wife | — | Hungary |
| 15 | Henry Friedman | 36 | Son | Machinist | Massachusetts |
| 16 | Sidney Friedman | 27 | Son | Chemist | Massachusetts |
| 17 | Mildred Friedman | 25 | Daughter-in-law | — | Massachusetts |
| 18 | Elisabeth D. Griffin | 77 | Head | — | Canada |
| 19 | Charles N. Griffin | 56 | Son | Telegrapher | New Hampshire |
| 20 | John F. Mahoney | 61 | Head | Fireman | Massachusetts |
| 21 | Mary E. Mahoney | 52 | Wife | — | Irish Free State |
| 22 | Margaret E. Mahoney THIS PERSON | 28 | Daughter | Stenographer | Massachusetts |
| 23 | Gerard E. Mahoney | 24 | Son | Clerk-Billing | Massachusetts |
| 24 | Mabel Nelson | 63 | Head | Seamtress | Canada |
| 25 | Roberta Nelson | 25 | Daughter | Teacher | Massachusetts |
| 26 | Delia Mcdonough | 45 | Head | Seamtress | Irish Free State |
| 27 | Ellen Mcdonough | 31 | Sister | Clerk-Typist | Irish Free State |
| 28 | Mary Mcdonough | 29 | Sister | Salesman | Irish Free State |
| 29 | John R. Mee | 44 | Head | Policeman | Rhode Island |
| 30 | Rose Mee | 42 | Wife | — | Massachusetts |
| 31 | Maureen Mee | 16 | Daughter | — | Massachusetts |
| 32 | Mary E. O'Connor | 38 | Head | Stenographer Secretary | Massachusetts |
| 33 | Thomas P. O'Connor | 33 | Brother | Truck Driver | Massachusetts |
| 34 | Andrew R. O'Connor | 27 | Brother | Salesman | Massachusetts |
| 35 | James Garrity | 32 | Head | Bartender | Irish Free State |
| 36 | Bessie Garrity | 32 | Wife | — | Irish Free State |
| 37 | John J. O'Connor | 42 | Head | Policeman | Massachusetts |
| 38 | Sadie L. O'Connor | 38 | Wife | — | Massachusetts |
| 39 | James O'Connor | 10 | Son | — | Massachusetts |
| 40 | John J. O'Connor | 7 | Son | — | Massachusetts |
Pedigree Summary
Margaret + 1 sibling
Gen 1 · 5 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)