MD
Margaret Duffy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Lawrence-County, Pennsylvania
Our Model Tree links this Margaret Duffy across the 1920, 1930 and 1940 US Censuses in Lawrence-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents John & John — first a daughter (b.~1919), then head of a 6-person household.
Age 21
b. ~1919
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lawrence-County, Pennsylvania |
| Surname | Duffy |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | ELLWOOD CITY BOROUGH |
| 1935 Residence (County) | LAWRENCE |
| Additional Details | |
| Occupation | Clerk |
| Industry | Retail Dairy Store |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 210 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Clerk |
| Township / Ward | Ellwood City Borough |
| Est. Birth Year | ~1919 |
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 |
|---|---|---|---|---|
| Eugene Duffy | Son | — | 23 | ~1917 |
| Margaret Duffy | Daughter | — | 21 | ~1919 |
| John Duffy | Head | — | 46 | ~1894 |
| Bernard Duffy | Son | — | 17 | ~1923 |
| Minnie Duffy | Spouse | — | 44 | ~1896 |
| Bernice Duffy | Daughter | — | 14 | ~1926 |
Census Appearances
1920
Lawrence, Pennsylvania
Daughter, age
Lawrence, Pennsylvania · implied b. ~1920 — 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 | 0 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | none |
| Can Read | No |
| Can Write | No |
| Speaks English | No |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Lawrence, Pennsylvania
Daughter, age 10
Lawrence, Pennsylvania · implied b. ~1920 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Margaret M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Lawrence-County, Pennsylvania
Daughter, age 21
Lawrence-County, Pennsylvania · implied b. ~1919 — 6 household members
| Surname | Duffy |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | ELLWOOD CITY BOROUGH |
| 1935 Residence (County) | LAWRENCE |
| Occupation | Clerk |
| Industry | Retail Dairy Store |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 210 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 John Duffy (~0.92 confidence) and father John Duffy (~0.92 confidence) and father John Duffy (~0.92 confidence) and mother Irene Duffy (~0.92 confidence) and mother Minnie Duffy (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Duffy
b. ~1895
Source father
● Household
· direct · ~0.92
Father
John Duffy
b. ~1894
Source father
● Household
· direct · ~0.92
Father
John Duffy
b. ~1894
Source father
● Household
· direct · ~0.92
Mother
Irene Duffy
b. ~1898
Source mother
● Household
· direct · ~0.92
Mother
Minnie Duffy
b. ~1896
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Margaret Duffy
Daughter · 1940 · age 21 · b. ~1919 · Pennsylvania
★ You are viewing this record
Sibling
Bernard Duffy
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernice Duffy
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eugene Duffy
Sibling · 1940 · age 23
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 — Lawrence-County, Pennsylvania
Open full size
1940 US Federal Census — Lawrence-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03536-00185)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Virginia Waidar | 20 | Daughter | Clerk | Pennsylvania |
| 2 | John Duffy | 46 | Head | Hot Mill | Pennsylvania |
| 3 | Minnie Duffy | 44 | Wife | — | Pennsylvania |
| 4 | Eugene Duffy | 23 | Son | Ambler | Pennsylvania |
| 5 | Margaret Duffy THIS PERSON | 21 | Daughter | Clerk | Pennsylvania |
| 6 | Bernard Duffy | 17 | Son | Newsboy | Pennsylvania |
| 7 | Bernice Duffy | 14 | Daughter | — | Pennsylvania |
| 8 | Colin J. Clarke | 71 | Head | Desk Sargent | England |
| 9 | Eva Clarke | 65 | Wife | — | Pennsylvania |
| 10 | Colin J. Jr. Clarke | 33 | Head | Inspector | Pennsylvania |
| 11 | Alice E. Clarke | 29 | Wife | — | Pennsylvania |
| 12 | Andrew Schencker | 43 | Head | Lathe Man | Transylvania |
| 13 | Mary Schencker | 42 | Wife | — | Pennsylvania |
| 14 | Andrew Jr. Schencker | 21 | Son | App Machine Shop | Pennsylvania |
| 15 | Paul A. Schencker | 18 | Son | Filer | Pennsylvania |
| 16 | Lillian M. Schencker | 15 | Daughter | — | Pennsylvania |
| 17 | Delmar Hutchinson | 33 | Head | Manager | Pennsylvania |
| 18 | Ruth Hutchinson | 31 | Wife | — | Pennsylvania |
| 19 | Delmar Jr. Hutchinson | 8 | Son | — | Pennsylvania |
| 20 | Martin Brenner | 37 | Head | Roll Turner | Pennsylvania |
| 21 | Mary Brenner | 29 | Wife | — | Roumania |
| 22 | Doris Brenner | 13 | Daughter | — | Pennsylvania |
| 23 | Janice Brenner | 4 | Daughter | — | Pennsylvania |
| 24 | Roy A. Welsh | 49 | Head | Hammerman | Pennsylvania |
| 25 | Frances Welsh | 36 | Wife | — | Ohio |
| 26 | Doris Welsh | 17 | Daughter | — | Pennsylvania |
| 27 | Roy Jr. Welsh | 14 | Son | — | Pennsylvania |
| 28 | Robt Beckley | 15 | Step Son | — | Pennsylvania |
| 29 | Leona Best | 32 | Sister-in-law | Housekeeper | Ohio |
| 30 | Frank Yanello | 50 | Head | Laborer | Italy |
| 31 | Asunda Yanello | 44 | Wife | — | Italy |
| 32 | Garret C. Cotter | 59 | Head | Moulder | Pennsylvania |
| 33 | Ellen Cotter | 57 | Wife | — | Pennsylvania |
| 34 | Mary A. Cotter | 7 | Daughter | — | Pennsylvania |
| 35 | Richard Nye | 50 | Head | Engineer | Pennsylvania |
| 36 | Etta Willa Nye | 46 | Wife | — | West Virginia |
| 37 | David Nye | 28 | Son | Mill Right | Pennsylvania |
| 38 | Marion Nye | 25 | Son | Laborer | Pennsylvania |
| 39 | Ellen Jean Nye | 18 | Daughter | House Keeper | Pennsylvania |
| 40 | May Nye | 17 | Daughter | — | Pennsylvania |
Pedigree Summary
Margaret + 3 siblings
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)