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John Mcgrath — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this John Mcgrath across the 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 9-person household.
Age 17
b. ~1923
Male
Son
Born: Penna
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | McGrath |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Penna |
| 1935 Residence (City) | Philadelphia City |
| 1935 Residence (County) | Philadelphia |
| Additional Details | |
| Occupation | new worker |
| Class of Worker | GW |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | Hs 8 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | penna |
| Occupation | New Worker |
| Township / Ward | Philadelphia City |
| Est. Birth Year | ~1923 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Mary Mcgrath | Daughter | — | 7 | ~1933 |
| Rita Mcgrath | Daughter | — | 20 | ~1920 |
| Elizabeth Mcgrath | Daughter | — | 26 | ~1914 |
| Joseph Mcgrath | Head | — | 53 | ~1887 |
| Francis Mcgrath | Son | — | 14 | ~1926 |
| Joseph Mcgrath | Son | — | 22 | ~1918 |
| George Mcgrath | Son | — | 11 | ~1929 |
| John Mcgrath | Son | — | 17 | ~1923 |
| Sarah Mcgrath | Spouse | — | 54 | ~1886 |
Census Appearances
1930
Philadelphia, Pennsylvania
Son, age 6
Philadelphia, Pennsylvania · implied b. ~1924 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | Jos. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Penna |
| Father's Birthplace | Penna |
| Mother's Birthplace | Penna |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | penna |
1940
Philadelphia-County, Pennsylvania
Son, age 17
Philadelphia-County, Pennsylvania · implied b. ~1923 — 9 household members
| Surname | McGrath |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Penna |
| 1935 Residence (City) | Philadelphia City |
| 1935 Residence (County) | Philadelphia |
| Occupation | new worker |
| Class of Worker | GW |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | Hs 8 |
| 1935 Residence | Same place |
| 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 Mcgrath across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Mcgrath
Son · 1940 · age 17 · b. ~1923 · Pennsylvania
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Sibling
George Mcgrath
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Mcgrath
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Mcgrath
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Mcgrath
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rita Mcgrath
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mcgrath
Sibling · 1940 · age 7
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-t0627-03709-00954)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Francis Werner | 17 | Son | Laborer | Penna |
| 2 | Florence Werner | 14 | Daughter | — | Penna |
| 3 | Anthony Jos Werner | 12 | Son | — | Penna |
| 4 | Michael Bryan | 52 | Head | — | Penna |
| 5 | Nellie Bryan | 48 | Wife | — | Penna |
| 6 | Annette Bryan | 24 | Daughter | Press Girl | Penna |
| 7 | Michael Bryan | 22 | Son | Laborer | Penna |
| 8 | James Bryan | 8 | Son | — | Penna |
| 9 | William Riley | 17 | Nephew | — | Penna |
| 10 | John Riley | 14 | Nephew | — | Penna |
| 11 | John Brady | 44 | Head | — | New York |
| 12 | Helen Brady | 43 | Wife | — | Penna |
| 13 | John Jr Brady | 20 | Son | New Worker | Penna |
| 14 | James Brady | 17 | Son | Laborer | Penna |
| 15 | Mary Brady | 15 | Daughter | — | Penna |
| 16 | Charles Brady | 12 | Son | — | Penna |
| 17 | Joseph Mcgrath | 53 | Head | Fireman | Penna |
| 18 | Sarah Mcgrath | 54 | Wife | — | Penna |
| 19 | Elizabeth Mcgrath | 26 | Daughter | Finisher | Penna |
| 20 | Joseph Mcgrath | 22 | Son | Operator | Penna |
| 21 | Rita Mcgrath | 20 | Daughter | Cleaner | Penna |
| 22 | John Mcgrath THIS PERSON | 17 | Son | New Worker | Penna |
| 23 | Francis Mcgrath | 14 | Son | — | Penna |
| 24 | George Mcgrath | 11 | Son | — | Penna |
| 25 | Mary Mcgrath | 7 | Daughter | — | Penna |
| 26 | Bernard Sobieski | 47 | Head | Laborer | Poland |
| 27 | Lucy Sobieski | 42 | Wife | — | Poland |
| 28 | Jean Sobieski | 17 | Daughter | Seamstress | Penna |
| 29 | Alfred Sobieski | 17 | Son | New Worker | Penna |
| 30 | Helen Sobieski | 14 | Daughter | — | Penna |
| 31 | Eleanor Sobieski | 12 | Daughter | — | Penna |
| 32 | Dolores Sobieski | 7 | Daughter | — | Penna |
| 33 | Valentine Mrozny | 46 | Head | Baker | Poland |
| 34 | Sophie Mrozny | 46 | Wife | — | Poland |
| 35 | Angelina Szumowski | 23 | Daughter | Mender | Penna |
| 36 | Joseph Szumowski | 27 | Son-in-law | Manager | Penna |
| 37 | Anthony Marcinowski | 68 | Head | Laborer | Poland |
| 38 | Victoria Marcinowski | 61 | Wife | — | Poland |
| 39 | Stephen Marcinowski | 20 | Son | — | Penna |
| 40 | Casimir Umbowski | 24 | Boarder | — | 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)