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John Mcgrath — 1940 US Census Record
Model Tree available1940 United States Federal Census · Bucks-County, Pennsylvania
Our Model Tree links this John Mcgrath across the 1920, 1930 and 1940 US Censuses in Bucks-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Peter & Grace — first a son (b.~1919), then head of a 5-person household.
Age 21
b. ~1919
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Bucks-County, Pennsylvania |
| Surname | McGrath |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (County) | Bucks |
| Additional Details | |
| Occupation | 40 |
| Industry | Clerk |
| Class of Worker | Chemical Plant |
| Highest Grade | H 4 |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | 40 |
| Township / Ward | Langhorne Manor 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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Mary Mcgrath | Daughter | — | 18 | ~1922 |
| Henry Mcgrath | Head | — | 50 | ~1890 |
| John Mcgrath | Son | — | 21 | ~1919 |
| Henry Mcgrath | Son | — | 22 | ~1918 |
| Frances Mcgrath | Spouse | — | 49 | ~1891 |
Census Appearances
1920
Philadelphia, Pennsylvania
Son, age
Philadelphia, Pennsylvania · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read | No |
| Can Write | No |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Philadelphia, Pennsylvania
Son, age 10
Philadelphia, Pennsylvania · implied b. ~1920 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | New York |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Bucks-County, Pennsylvania
Son, age 21
Bucks-County, Pennsylvania · implied b. ~1919 — 5 household members
| Surname | McGrath |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (County) | Bucks |
| Occupation | 40 |
| Industry | Clerk |
| Class of Worker | Chemical Plant |
| Highest Grade | H 4 |
| 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 Mcgrath across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Peter Mcgrath (~0.92 confidence) and mother Grace Mcgrath (~0.92 confidence) and father John Mcgrath (~0.92 confidence) and father Henry Mcgrath (~0.92 confidence) and mother Frances Mcgrath (~0.92 confidence) and mother Anna Mcgrath (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Peter Mcgrath
b. ~1885
Source father
● Household
· direct · ~0.92
Mother
Grace Mcgrath
b. ~1887
Source mother
● Household
· direct · ~0.92
Father
John Mcgrath
b. ~1890
Source father
● Household
· direct · ~0.92
Father
Henry Mcgrath
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Frances Mcgrath
b. ~1891
Source mother
● Household
· direct · ~0.92
Mother
Anna Mcgrath
b. ~1895
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mcgrath
Son · 1940 · age 21 · b. ~1919 · Pennsylvania
★ You are viewing this record
Sibling
Henry Mcgrath
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mcgrath
Sibling · 1940 · 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
1940 US Federal Census — Bucks-County, Pennsylvania
Open full size
1940 US Federal Census — Bucks-County, Pennsylvania
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-03445-00588)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Margaret Ann Kavanaugh | 2 | Daughter | — | Pennsylvania |
| 2 | Clarence Brewster | 36 | Head | 40 | Pennsylvania |
| 3 | Emily Brewster | 31 | Wife | — | New Jersey |
| 4 | David Brewster | 5 | Son | — | New Jersey |
| 5 | James Brewster | 3 | Son | — | New Jersey |
| 6 | William Kurlish | 26 | Head | 40 | Pennsylvania |
| 7 | Edith Kurlish | 26 | Wife | — | Pennsylvania |
| 8 | Joseph Stephenson | 44 | Head | 40 | Pennsylvania |
| 9 | Mary Stephenson | 41 | Wife | — | Pennsylvania |
| 10 | Virginia Masson | 20 | Daughter | — | Pennsylvania |
| 11 | Donald Masson | 3 | Grandson | — | Pennsylvania |
| 12 | John Sumner | 35 | Head | 40 | Massachusetts |
| 13 | Dorothy Sumner | 31 | Wife | — | Rhode Island |
| 14 | Elizabeth Ann Sumner | 1 | Daughter | — | Pennsylvania |
| 15 | William Meldrum | 46 | Head | 50 | Pennsylvania |
| 16 | Alice Meldrum | 53 | Wife | — | Pennsylvania |
| 17 | George Meldrum | 22 | Son | 40 | Pennsylvania |
| 18 | Ralph H. Wight | 50 | Head | 40 | Maine |
| 19 | Mary H. Wight | 46 | Wife | 40 | New York |
| 20 | Minnie Wood | 65 | Mother in law | — | Canada |
| 21 | Henry A. Mcgrath | 50 | Head | 40 | Pennsylvania |
| 22 | Frances M. Mcgrath | 49 | Wife | — | Pennsylvania |
| 23 | Henry Jr. Mcgrath | 22 | Son | 40 | Pennsylvania |
| 24 | John Mcgrath THIS PERSON | 21 | Son | 40 | Pennsylvania |
| 25 | Mary Mcgrath | 18 | Daughter | — | Pennsylvania |
| 26 | William Gotswald | 28 | Head | 40 | Pennsylvania |
| 27 | Mary Gotswald | 25 | Wife | — | Pennsylvania |
| 28 | William Jr. Gotswald | 1 | Son | — | New Jersey |
| 29 | Thomas E. Coe | 37 | Head | 35 | Pennsylvania |
| 30 | Marie Coe | 32 | Wife | — | Pennsylvania |
| 31 | Elaine Coe | 9 | Daughter | — | Pennsylvania |
| 32 | Amadio Cannonnandi | 55 | Head | Silk Boiler | Italy |
| 33 | Ettore Cannonnandi | 24 | Son | 40 | Pennsylvania |
| 34 | Rose Cannonnandi | 22 | Daughter | — | Pennsylvania |
| 35 | Nazzereno Decarolis | 70 | Lodger | Handy Man | Italy |
| 36 | Irene S. Seipt | 53 | Head | 44 | Pennsylvania |
| 37 | Daniel Schumo | 81 | Father | — | Pennsylvania |
| 38 | Lydia Furst | 24 | Lodger | 42 | Oregon |
| 39 | Elizabeth Barry | 30 | Lodger | 32 | Rhode Island |
Pedigree Summary
John + 2 siblings
Gen 1 · 6 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)