JD
John Duffy — 1920 US Census Record
Linked across censuses1920 United States Federal Census · Philadelphia, Pennsylvania
Our Model Tree links this John Duffy across the 1910 and 1920 US Censuses in Philadelphia, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1900), then head of a 11-person household.
Age 20
b. ~1900
Male
Son
Born: Pennsylvania
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | Philadelphia, Pennsylvania |
| Surname | Duffy |
| Given Name | John E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Additional Details | |
| Occupation | Clerk |
| Industry | Railroad |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Clerk |
| Township / Ward | Philadelphia City |
| Est. Birth Year | ~1900 |
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.
11 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Anna Duffy | Daughter | — | 6 | ~1914 |
| John Duffy | Head | — | 43 | ~1877 |
| Kathryn Wallace | Other | — | 22 | ~1898 |
| Joseph Duffy | Son | — | 13 | ~1907 |
| Francis Duffy | Son | — | 4 | ~1916 |
| Charles Duffy | Son | — | 15 | ~1905 |
| William Duffy | Son | — | 17 | ~1903 |
| John Duffy | Son | — | 20 | ~1900 |
| Edward Duffy | Son | — | 8 | ~1912 |
| James Duffy | Son | — | 18 | ~1902 |
| Mary Duffy | Spouse | — | 40 | ~1880 |
Census Appearances
1910
Philadelphia, Pennsylvania
Son, age 9
Philadelphia, Pennsylvania · implied b. ~1901 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1920
Philadelphia, Pennsylvania
Son, age 20
Philadelphia, Pennsylvania · implied b. ~1900 — 11 household members
| Surname | Duffy |
| Given Name | John E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Clerk |
| Industry | Railroad |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| 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 John Duffy across 2 US Census years (1910 and 1920) in Philadelphia, Pennsylvania, using XGBoost record linkage.
Show:
This person
Anchor record
John Duffy
Son · 1920 · age 20 · b. ~1900 · Pennsylvania
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Sibling
Francis Duffy
Sibling · 1920 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Duffy
Sibling · 1920 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Duffy
Sibling · 1920 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Duffy
Sibling · 1920 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Duffy
Sibling · 1920 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Duffy
Sibling · 1920 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Duffy
Sibling · 1920 · age 18
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
1920 US Federal Census — Philadelphia, Pennsylvania
Open full size
1920 US Federal Census — Philadelphia, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu1648unit:0486)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ida Johns | 12 | Daughter | — | Pennsylvania |
| 2 | Edna Johns | 14 | Daughter | — | Pennsylvania |
| 3 | Mildred Johns | 11 | Daughter | — | Pennsylvania |
| 4 | Grace Augusta Johns | 34 | Boarder | Clerk | Strasbourg |
| 5 | Madeline Johns | 11 | Boarder | — | Pennsylvania |
| 6 | Martha Johns | 10 | Boarder | — | Pennsylvania |
| 7 | Helen Johns | 7 | Boarder | — | Pennsylvania |
| 8 | Norman Johns | 6 | Boarder | — | Pennsylvania |
| 9 | Thelma Johns | 4 | Boarder | — | Pennsylvania |
| 10 | Thomas Forman | 48 | Head | Stableman | Pennsylvania |
| 11 | Julia Forman | 48 | Wife | — | Pennsylvania |
| 12 | Lucy Forman | 19 | Daughter | Stockgirl | Pennsylvania |
| 13 | Edward Forman | 15 | Son | Tool Clerk | Pennsylvania |
| 14 | Thomas Forman | 14 | Son | — | Pennsylvania |
| 15 | Joseph Forman | 12 | Son | — | Pennsylvania |
| 16 | Marie Forman | 9 | Daughter | — | Pennsylvania |
| 17 | Margaret Forman | 7 | Daughter | — | Pennsylvania |
| 18 | Helen Forman | 5 | Daughter | — | Pennsylvania |
| 19 | John Duffy | 43 | Head | Lieutenant | Pennsylvania |
| 20 | Mary Duffy | 40 | Wife | — | Pennsylvania |
| 21 | John E. Duffy THIS PERSON | 20 | Son | Clerk | Pennsylvania |
| 22 | James Duffy | 18 | Son | Electrician Helper | Pennsylvania |
| 23 | William J. Duffy | 17 | Son | — | Pennsylvania |
| 24 | Charles B. Duffy | 15 | Son | — | Pennsylvania |
| 25 | Joseph L. Duffy | 13 | Son | — | Pennsylvania |
| 26 | Edward Duffy | 8 | Son | — | Pennsylvania |
| 27 | Anna R. Duffy | 6 | Daughter | — | Pennsylvania |
| 28 | Francis Duffy | 4 | Son | — | Pennsylvania |
| 29 | Kathryn G. Wallace | 22 | Niece | Operator | Pennsylvania |
| 30 | James Burns | 51 | Head | Watchman | Ireland |
| 31 | Agnes Burns | 50 | Wife | — | Ireland |
| 32 | Patrick Burns | 25 | Son | Clerk | Pennsylvania |
| 33 | Agnes Burns | 23 | Daughter | Typist | Pennsylvania |
| 34 | Anna Burns | 21 | Daughter | Typist | Pennsylvania |
| 35 | Thomas Burns | 14 | Son | — | Pennsylvania |
| 36 | John F. Mader | 48 | Head | Brakeman | Maryland |
| 37 | Dora Mader | 43 | Wife | — | Maryland |
| 38 | Paul H. Lingenwald | 22 | Nephew | Radio Inspector | Maryland |
| 39 | Jacob L. Merkel | 45 | Head | Machinist | Pennsylvania |
| 40 | Ada Merkel | 43 | Wife | — | Alabama |
| 41 | Jacob L. Jr. Merkel | 18 | Son | Machinist | Pennsylvania |
| 42 | Jessie G. Merkel | 21 | Daughter | Operator | Pennsylvania |
| 43 | Joseph B. Merkel | 9 | Son | — | Pennsylvania |
| 44 | Joseph A. Cooper | 44 | Brother in Law | Electrician | Pennsylvania |
| 45 | Ada James | 42 | Head | — | England |
| 46 | Herbert A. James | 53 | Brother | Butcher | England |
| 47 | Maggie Pond | 46 | Boarder | Operator | Pennsylvania |
| 48 | Amelia Smith | 45 | Boarder | Steam Fitter | Pennsylvania |
| 49 | Margaret Donahue | 60 | Head | — | Pennsylvania |
| 50 | James Donahue | 45 | Boarder | Stillman | Ireland |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)