MD
Margaret Duffy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Mercer-County, New Jersey
Our Model Tree links this Margaret Duffy across the 1920, 1930 and 1940 US Censuses in Mercer-County, New Jersey (XGBoost, ~Confirmed), with identified parents Ambrose & Malichi — first a daughter (b.~1908), then head of a 3-person household.
Age 32
b. ~1908
Female
Daughter
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Mercer-County, New Jersey |
| Surname | Duffy |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Trenton City |
| 1935 Residence (County) | Mercer |
| Additional Details | |
| Occupation | Bookkeeper |
| Industry | Graham Co. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1099 |
| Highest Grade | C-2 |
| 1935 Residence | Same House |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Occupation | Bookkeeper |
| Township / Ward | Trenton City |
| Est. Birth Year | ~1908 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| Mary Duffy | Daughter | — | 38 | ~1902 |
| Anna Duffy | Head | — | 68 | ~1872 |
| Margaret Duffy | Daughter | — | 32 | ~1908 |
Census Appearances
1920
Mercer, New …
Daughter, age 11
Mercer, New Jersey · implied b. ~1909 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Mercer, New …
Daughter, age 22
Mercer, New Jersey · implied b. ~1908 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffey |
| Given Name | Margret |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Typist |
| Industry | State House |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Mercer-County, New …
Daughter, age 32
Mercer-County, New Jersey · implied b. ~1908 — 3 household members
| Surname | Duffy |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Trenton City |
| 1935 Residence (County) | Mercer |
| Occupation | Bookkeeper |
| Industry | Graham Co. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1099 |
| Highest Grade | C-2 |
| 1935 Residence | Same House |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 Duffy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Ambrose Duffy (~0.92 confidence) and father Malichi Duffey (~0.92 confidence) and mother Anastasia Duffy (~0.92 confidence) and mother Anna Duffy (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Ambrose Duffy
b. ~1872
Source father
● Household
· direct · ~0.92
Father
Malichi Duffey
b. ~1867
Source father
● Household
· direct · ~0.92
Mother
Anastasia Duffy
b. ~1878
Source mother
● Household
· direct · ~0.92
Mother
Anna Duffy
b. ~1872
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Margaret Duffy
Daughter · 1940 · age 32 · b. ~1908 · New Jersey
★ You are viewing this record
Sibling
Mary Duffy
Sibling · 1940 · age 38
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 — Mercer-County, New Jersey
Open full size
1940 US Federal Census — Mercer-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02437-00518)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Harold Finton | 36 | Head | Dairyman | New Jersey |
| 42 | Elizabeth L Finton | 35 | Wife | — | Michigan |
| 43 | Marjorie Ann Finton | 8 | Daughter | — | Michigan |
| 44 | Virginia R Finton | 5 | Daughter | — | New Jersey |
| 45 | Russell A Foss | 39 | Head | Auditor | New Jersey |
| 46 | Helen M Foss | 37 | Wife | — | New Jersey |
| 47 | Russell G Foss | 10 | Son | — | New Jersey |
| 48 | Mary C Mcnulty | 49 | Head | — | New Jersey |
| 49 | Thomas A Mcnulty | 47 | Husband | — | New Jersey |
| 50 | Thomas A Jr Mcnulty | 20 | Son | — | New Jersey |
| 51 | James B Mcnulty | 15 | Son | — | New Jersey |
| 52 | Mary Ellen Mcnulty | 6 | Daughter | — | New Jersey |
| 53 | Anna Duffy | 68 | Head | — | Ireland |
| 54 | Mary Agnes Duffy | 38 | Daughter | Cashier | New Jersey |
| 55 | Margaret Duffy THIS PERSON | 32 | Daughter | Bookkeeper | New Jersey |
| 56 | Kenneth Talley | 32 | Head | Stenographer | Ohio |
| 57 | Edith Talley | 30 | Wife | Coco Cola | New Jersey |
| 58 | Kenneth D Talley | 6 | Son | — | New Jersey |
| 59 | Donald Talley | 5 | Son | — | New Jersey |
| 60 | Gilbert Hockenbury | 47 | Head | — | New Jersey |
| 61 | Louis Hockenbury | 46 | Brother | Inspector | New Jersey |
| 62 | Ruth Hockenbury | 36 | Sister-in-law | Stenographer | New Jersey |
| 63 | Edward Connolly | 50 | Head | Salesman | New Jersey |
| 64 | Madeline Connolly | 45 | Wife | Accountant | New Jersey |
| 65 | Eleanor Connolly | 17 | Daughter | — | New Jersey |
| 66 | Edward Jr Connolly | 12 | Son | — | New Jersey |
| 67 | John S Anthony | 49 | Head | City | New Jersey |
| 68 | Grace Anthony | 49 | Wife | — | New Jersey |
| 69 | Edward Forrest | 60 | Head | Salesman | New Jersey |
| 70 | Margaret Forrest | 54 | Sister | Operator | New Jersey |
| 71 | Alice Forrest | 40 | Sister | Secretary | New Jersey |
| 72 | Bertha Marie Forrest | 60 | Sister | Teacher | New Jersey |
| 73 | Jennie P Case | 63 | Head | — | New Jersey |
| 74 | Arthur Edwards | 43 | Head | Dentist | Massachusetts |
| 75 | Marion Edwards | 36 | Wife | — | New Jersey |
| 76 | Lawrence Edwards | 12 | Son | — | New Jersey |
| 77 | Elizabeth A Edwards | 11 | Daughter | — | New Jersey |
| 78 | Sarah Jane Edwards | 3 | Daughter | — | New Jersey |
| 79 | Myles Joyce | 70 | Head | Retired | New Jersey |
| 80 | O'Malley Joyce | 67 | Sister | — | New Jersey |
Pedigree Summary
Margaret + 1 sibling
Gen 1 · 4 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)