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John Brennan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this John Brennan across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Thomas & Frances — first a son (b.~1918), then head of a 6-person household.
Age 22
b. ~1918
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Brennan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh City |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Occupation | Helper |
| Industry | Trucking |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 640 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Helper |
| Township / Ward | Pittsburgh City |
| Est. Birth Year | ~1918 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Helen Brennan | Daughter | — | 26 | ~1914 |
| Mary Brennan | Head | — | 51 | ~1889 |
| Joseph Scanlon | Other | — | 46 | ~1894 |
| John Scanlon | Other | — | 78 | ~1862 |
| John Brennan | Son | — | 22 | ~1918 |
| Luke Brennan | Son | — | 23 | ~1917 |
Census Appearances
1920
Lehigh, Pennsylvania
Son, age 2
Lehigh, Pennsylvania · implied b. ~1918 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Allegheny, Pennsylvania
Son, age 12
Allegheny, Pennsylvania · implied b. ~1918 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Wales |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Son, age 22
Allegheny-County, Pennsylvania · implied b. ~1918 — 6 household members
| Surname | Brennan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh City |
| 1935 Residence (County) | Allegheny |
| Occupation | Helper |
| Industry | Trucking |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 640 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| 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 Brennan across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage. Identified parents: father Thomas Brennan (~0.92 confidence) and mother Frances Brennan (~0.92 confidence) and father Luke Brennan (~0.92 confidence) and mother Mary Brennan (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Thomas Brennan
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Frances Brennan
b. ~1880
Source mother
● Household
· direct · ~0.92
Father
Luke Brennan
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
Mary Brennan
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Brennan
Son · 1940 · age 22 · b. ~1918 · Pennsylvania
★ You are viewing this record
Sibling
Helen Brennan
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Luke Brennan
Sibling · 1940 · age 23
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 — Allegheny-County, Pennsylvania
Open full size
1940 US Federal Census — Allegheny-County, Pennsylvania
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-03667-00527)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | William Thomson | 96 | Father | — | Scotland |
| 42 | Urban Reich | 47 | Head | Truck Driver | Pennsylvania |
| 43 | Frances Reich | 40 | Wife | Saleslady | Pennsylvania |
| 44 | Richard Reich | 14 | Son | — | Pennsylvania |
| 45 | Mary G. Brennan | 51 | Head | — | Wales |
| 46 | Helen Brennan | 26 | Daughter | Nurse | Pennsylvania |
| 47 | Luke Brennan | 23 | Son | Truck Driver | Pennsylvania |
| 48 | John Brennan THIS PERSON | 22 | Son | Helper | Pennsylvania |
| 49 | John Scanlon | 78 | Father | — | Wales |
| 50 | Joseph Scanlon | 46 | Brother | Police Officer | Pennsylvania |
| 52 | Josephine Osborne | 82 | Head | — | Pennsylvania |
| 53 | David L. Winslow | 42 | Head | Salesman | Pennsylvania |
| 54 | Dorothy Winslow | 42 | Wife | — | Pennsylvania |
| 55 | David Winslow | 14 | Son | — | Pennsylvania |
| 56 | Phyllis Winslow | 12 | Daughter | — | Pennsylvania |
| 57 | Fred H. Dawson | 35 | Head | Laborer | Pennsylvania |
| 58 | Mary L. Dawson | 32 | Wife | — | Pennsylvania |
| 59 | Pline Aranta | 24 | Wife | — | Italy |
| 60 | James Aranta | 36 | Head | Barber | Italy |
| 61 | Marion Aranta | 5 | Daughter | — | Pennsylvania |
| 62 | Anothy Aranta | 2 | Daughter | — | Pennsylvania |
| 63 | Joseph Orlando | 47 | Head | Carpenter | Italy |
| 64 | Melante Orlando | 42 | Wife | — | Italy |
| 65 | Vincent Orlando | 27 | Son | Apprentice | Pennsylvania |
| 66 | Charles Gould | 39 | Head | Tailor | England |
| 67 | Florence Gould | 32 | Wife | — | Pennsylvania |
| 68 | Sidney Gould | 11 | Son | — | Pennsylvania |
| 69 | Lee Gould | 4 | Daughter | — | Pennsylvania |
| 70 | Rudolph Metelan | 32 | Head | Warehouseman | Pennsylvania |
| 71 | Louise Metelan | 27 | Wife | — | Pennsylvania |
| 72 | Gloria Metelan | 9 | Daughter | — | Pennsylvania |
| 73 | Louise Metelan | 7 | Daughter | — | Pennsylvania |
| 74 | George Miller | 53 | Head | Steam Helper | Pennsylvania |
| 75 | Winifred Miller | 42 | Wife | — | Pennsylvania |
| 76 | Orville Miller | 20 | Son | New Worker | Pennsylvania |
| 77 | Marvin Miller | 8 | Son | — | Pennsylvania |
| 78 | Frank Eckert | 67 | Head | Laborer | Germany |
| 79 | Mary Eckert | 65 | Wife | — | Germany |
| 80 | Ernest Kaul | 25 | Head | Truck Driver | Pennsylvania |
Pedigree Summary
John + 2 siblings
Gen 1 · 4 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)