JC
John Callahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this John Callahan across the 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1914), then head of a 10-person household.
Age 26
b. ~1914
Male
Son
Born: Penna
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | Callahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Penna |
| 1935 Residence (City) | Philadelphia City |
| 1935 Residence (County) | Philadelphia |
| Additional Details | |
| Occupation | Laborer |
| Industry | Private Home |
| Class of Worker | PW |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | penna |
| Occupation | Laborer |
| Township / Ward | Philadelphia City |
| Est. Birth Year | ~1914 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Susan Callahan | Daughter | — | 10 | ~1930 |
| Mary Callahan | Daughter | — | 18 | ~1922 |
| Catherine Callahan | Daughter | — | 14 | ~1926 |
| Mary Callahan | Head | — | 48 | ~1892 |
| John Callahan | Son | — | 26 | ~1914 |
| Thomas Callahan | Son | — | 20 | ~1920 |
| Charles Callahan | Son | — | 12 | ~1928 |
| Patrick Callahan | Son | — | 16 | ~1924 |
| William Callahan | Son | — | 23 | ~1917 |
| Joseph Callahan | Son | — | 21 | ~1919 |
Census Appearances
1930
Philadelphia, Pennsylvania
Son, age 17
Philadelphia, Pennsylvania · implied b. ~1913 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Penna |
| Father's Birthplace | Penna |
| Mother's Birthplace | Penna |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | penna |
1940
Philadelphia-County, Pennsylvania
Son, age 26
Philadelphia-County, Pennsylvania · implied b. ~1914 — 10 household members
| Surname | Callahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Penna |
| 1935 Residence (City) | Philadelphia City |
| 1935 Residence (County) | Philadelphia |
| Occupation | Laborer |
| Industry | Private Home |
| Class of Worker | PW |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | penna |
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 Callahan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Callahan
Son · 1940 · age 26 · b. ~1914 · Pennsylvania
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Sibling
William Callahan
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Callahan
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Susan Callahan
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Callahan
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Callahan
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patrick Callahan
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Callahan
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Callahan
Sibling · 1940 · age 20
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 — Philadelphia-County, Pennsylvania
Open full size
1940 US Federal Census — Philadelphia-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03707-00601)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | James Mccormick | 70 | Head | — | Free States |
| 2 | Catherine Mccormick | 55 | Wife | — | Penna |
| 3 | Mabre Miller | 64 | Head | — | Penna |
| 4 | William Cressman | 29 | Head | Printer | Penna |
| 5 | Margaret Cressman | 25 | Wife | — | California |
| 6 | Florence Perry | 54 | M in Law | — | Penna |
| 7 | Rose Long | 49 | Head | Nurse | Massachusetts |
| 8 | Gertrude Long | 44 | Sister | Seamstress | Massachusetts |
| 9 | Helen Long | 61 | Sister | — | Massachusetts |
| 10 | Thomas Long | 7 | Nephew | — | Penna |
| 11 | Mary Callahan | 48 | Head | — | Ireland |
| 12 | John Callahan THIS PERSON | 26 | Son | Laborer | Penna |
| 13 | William J. Callahan | 23 | Son | Book Keeper | Penna |
| 14 | Joseph G. Callahan | 21 | Son | — | Penna |
| 15 | Thomas H. Callahan | 20 | Son | — | Penna |
| 16 | Mary G. Callahan | 18 | Daughter | — | Penna |
| 17 | Patrick J. Callahan | 16 | Son | — | Penna |
| 18 | Catherine G. Callahan | 14 | Daughter | — | Penna |
| 19 | Charles L. Callahan | 12 | Son | — | Penna |
| 20 | Susan F. Callahan | 10 | Daughter | — | Penna |
| 21 | Robert Deer | 50 | Head | Night Watchman | Penna |
| 22 | Mary Deer | 44 | Wife | — | Penna |
| 23 | Marie Echowryin|Echowryia | 24 | Daughter | — | Penna |
| 24 | Charles Echowryin|Echowryia | 26 | Son in Law | Baker | Penna |
| 25 | Robert Echowryin|Echowryia | 1 | Grandson | — | Penna |
| 26 | Anna Deer | 22 | Daughter | Servant | Penna |
| 27 | Dorothy Deer | 20 | Daughter | — | Penna |
| 28 | Robert W. A. Deer | 19 | Son | Labour | Penna |
| 29 | Elizabeth Deer | 15 | Daughter | — | Penna |
| 30 | Thomas Deer | 13 | Son | — | Penna |
| 31 | Billy Deer | 12 | Son | — | Penna |
| 32 | Patricia Deer | 11 | Daughter | — | Penna |
| 33 | Francis Deer | 9 | Daughter | — | Penna |
| 34 | Robert Johnston | 73 | Head | — | Penna |
| 35 | Florence B. Johnston | 57 | Wife | — | New Jersey |
| 36 | Florence E. Johnston | 30 | Daughter | Technologist | Penna |
| 37 | George F. Simmons | 51 | Head | Clock Maker | Delaware |
| 38 | Alma E. Simmons | 44 | Wife | — | Delaware |
| 39 | Alma E. Simmons | 22 | Daughter | Clerk | Penna |
| 40 | Alma E. Simmons | 17 | Daughter | — | Penna |
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)