MD
Mary Duffy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this Mary Duffy across the 1910, 1920, 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed) — first a spouse (b.~1877), then head of a 4-person household.
Age 63
b. ~1877
Female
Spouse
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | PHILADELPHIA |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | Philadelphia |
| Est. Birth Year | ~1877 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Nora Duffy | Daughter | — | 25 | ~1915 |
| James Duffy | Head | — | 73 | ~1867 |
| James Duffy | Son | — | 29 | ~1911 |
| Mary Duffy | Spouse | — | 63 | ~1877 |
Census Appearances
1910
Philadelphia, Pennsylvania
Spouse, age 29
Philadelphia, Pennsylvania · implied b. ~1881 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Marie |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Ireland |
| Years Married | 2 |
| Children Born | 2 |
| Children Living | 2 |
| Year of Immigration | 1899 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1920
Philadelphia, Pennsylvania
Spouse, age 41
Philadelphia, Pennsylvania · implied b. ~1879 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Marie |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Ireland |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
Philadelphia, Pennsylvania
Spouse, age 52
Philadelphia, Pennsylvania · implied b. ~1878 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | Marie |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1882 |
| Age at First Marriage | 28 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Veteran | No |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Philadelphia-County, Pennsylvania
Spouse, age 63
Philadelphia-County, Pennsylvania · implied b. ~1877 — 4 household members
| Surname | Duffy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | PHILADELPHIA |
| Naturalization Status | Naturalized |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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 Duffy across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Duffy
Spouse · 1940 · age 63 · b. ~1877 · Pennsylvania
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Philadelphia-County, Pennsylvania
Open full size
1940 US Federal Census — Philadelphia-County, Pennsylvania
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-03746-00756)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Loraine Flannery | 14 | Daughter | — | Pennsylvania |
| 2 | Margaret Flannery | 12 | Daughter | — | Pennsylvania |
| 3 | Herman Meier | 77 | Father | — | Pennsylvania |
| 4 | Christina Baker | 65 | Head | Cutter | Scotland |
| 5 | Son Frank | None | M | S. S. White | — |
| 6 | Grand Son Frank | None | M | — | — |
| 7 | Emma Breckenridge | 55 | Sister-in-law | Store Keeper | Pennsylvania |
| 8 | Irene Bobbing | 52 | Head | Cigar Store | Pennsylvania |
| 9 | Ellsworth Mahlin | 78 | Father | — | Pennsylvania |
| 10 | Irene Mahlin | 72 | Mother | — | Pennsylvania |
| 11 | Ellsworth Mahlin | 46 | Brother | Laborer | Pennsylvania |
| 12 | Joseph Mahlin | 53 | Brother | Laborer | Pennsylvania |
| 13 | May Adam | 34 | Lodger | Officer | Pennsylvania |
| 14 | Florence Fuss | 56 | Head | — | Pennsylvania |
| 15 | Laura Vealz | 43 | Sister | — | Pennsylvania |
| 16 | Brother-In-Law Thomas | None | M | R. R. Ball. R. D. | — |
| 17 | June Thomas | 15 | Niece | — | Pennsylvania |
| 18 | Theodore Fuss | 53 | Head | Hardware Store | Pennsylvania |
| 19 | Edith Fuss | 54 | Wife | — | Delaware |
| 20 | Caroline Zimmerman | 60 | Head | — | Pennsylvania |
| 21 | Ellis Sr. Cook | 46 | Head | Well Driller | Pennsylvania |
| 22 | Fanny Cook | 42 | Wife | — | Pennsylvania |
| 23 | Ruth Cook | 22 | Daughter | Cashier | Pennsylvania |
| 24 | Ellis Jr. Cook | 92 | Father | — | Pennsylvania |
| 25 | Frank Marst | 26 | Head | Glazer | Pennsylvania |
| 26 | Mazie Marst | 26 | Wife | — | Pennsylvania |
| 27 | Kathleen Marst | 5 | Daughter | — | Pennsylvania |
| 28 | James Duffy | 73 | Head | Ice Man | England |
| 29 | Mary Duffy THIS PERSON | 63 | Wife | — | Ireland |
| 30 | James Duffy | 29 | Son | Installer | Pennsylvania |
| 31 | Nora Duffy | 25 | Daughter | Saleslady | Pennsylvania |
| 32 | James Howard | 50 | Head | Fireman | Pennsylvania |
| 33 | Theresa Howard | 46 | Wife | — | Pennsylvania |
| 34 | Elizabeth Howard | 22 | Daughter | Nurse | Pennsylvania |
| 35 | Frank Howard | 20 | Son | Machinist | Pennsylvania |
| 36 | Walter Gehr | 50 | Head | Guard | Pennsylvania |
| 37 | Verna Gehr | 48 | Wife | — | Pennsylvania |
| 38 | Verna Gehr | 23 | Daughter | Clerk | Pennsylvania |
| 39 | Dorothy Gehr | 16 | Daughter | — | Pennsylvania |
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)