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John Brennan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Northumberland-County, Pennsylvania
Our Model Tree links this John Brennan across the 1920, 1930 and 1940 US Censuses in Northumberland-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Charles & Anna — first a son (b.~1913), then head of a 7-person household.
Age 27
b. ~1913
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Northumberland-County, Pennsylvania |
| Surname | Brennan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Mount Carmel Borough |
| 1935 Residence (County) | Northumberland |
| Additional Details | |
| Occupation | Laborer |
| Industry | Coal Stripping |
| Class of Worker | PW |
| Hours Worked | 15 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Laborer |
| Township / Ward | Mount Carmel Borough |
| Est. Birth Year | ~1913 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Rita Brennan | Daughter | — | 11 | ~1929 |
| Charles Brennan | Head | — | 51 | ~1889 |
| Aloisius Brennan | Son | — | 18 | ~1922 |
| Francis Brennan | Son | — | 16 | ~1924 |
| John Brennan | Son | — | 27 | ~1913 |
| Charles Brennan | Son | — | 26 | ~1914 |
| Anna Brennan | Spouse | — | 51 | ~1889 |
Census Appearances
1920
Northumberland, Pennsylvania
Son, age 7
Northumberland, Pennsylvania · implied b. ~1913 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Northumberland, Pennsylvania
Son, age 18
Northumberland, Pennsylvania · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brenen |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Slate Picker |
| Industry | Coal breaker |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Northumberland-County, Pennsylvania
Son, age 27
Northumberland-County, Pennsylvania · implied b. ~1913 — 7 household members
| Surname | Brennan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Mount Carmel Borough |
| 1935 Residence (County) | Northumberland |
| Occupation | Laborer |
| Industry | Coal Stripping |
| Class of Worker | PW |
| Hours Worked | 15 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 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 2 locations, using XGBoost record linkage. Identified parents: father Charles Brennan (~0.92 confidence) and mother Anna Brennan (~0.92 confidence) and father Charles Brennan (~0.92 confidence) and mother Anna Brennan (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Charles Brennan
b. ~1884
Source father
● Household
· direct · ~0.92
Mother
Anna Brennan
b. ~1889
Source mother
● Household
· direct · ~0.92
Father
Charles Brennan
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Anna Brennan
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Brennan
Son · 1940 · age 27 · b. ~1913 · Pennsylvania
★ You are viewing this record
Sibling
Francis Brennan
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Aloisius Brennan
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Brennan
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rita Brennan
Sibling · 1940 · age 11
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 — Northumberland-County, Pennsylvania
Open full size
1940 US Federal Census — Northumberland-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03596-00658)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Leo Malarky | 40 | Head | Salesman | Pennsylvania |
| 2 | Mary Malarky | 35 | Wife | Bookkeeper | Pennsylvania |
| 3 | Evan Jones | 39 | Head | Private Detective | Pennsylvania |
| 4 | Elizabeth Jones | 36 | Wife | — | Pennsylvania |
| 5 | Anna Poklembo | 52 | Head | — | Austria |
| 6 | Mildred Poklembo | 18 | Daughter | New Worker | Pennsylvania |
| 7 | John Muldoon | 33 | Son-in-law | Engineer (Hoisting) | Pennsylvania |
| 8 | Anna Muldoon | 31 | Daughter | — | Pennsylvania |
| 9 | Anne Marie Muldoon | 9 | Grand-daughter | — | Pennsylvania |
| 10 | Joan Muldoon | 7 | Grand-daughter | — | Pennsylvania |
| 11 | Jean Muldoon | 4 | Grand-daughter | — | Pennsylvania |
| 12 | Mary Theresa Muldoon | 1 | Grand-daughter | — | Pennsylvania |
| 13 | Antoinette Przybylski | 0 | Grand-daughter | — | Pennsylvania |
| 14 | James B. Hedrick | 32 | Head | Service Man | Pennsylvania |
| 15 | Elizabeth Hedrick | 31 | Wife | — | Pennsylvania |
| 16 | James M. Hedrick | 4 | Son | — | Pennsylvania |
| 17 | Robert E. Else | 53 | Head | Salesman | Pennsylvania |
| 18 | Emma E. Else | 53 | Wife | — | Pennsylvania |
| 19 | Robert Jr. Else | 19 | Son | Salesman | Pennsylvania |
| 20 | Louis Castello | 50 | Head | Miner | Pennsylvania |
| 21 | Mary Castello | 44 | Wife | — | Pennsylvania |
| 22 | Eleanore Castello | 19 | Daughter | New Worker | Pennsylvania |
| 23 | Louis Jr. Castello | 15 | Son | — | Pennsylvania |
| 24 | Francis Castello | 14 | Son | — | Pennsylvania |
| 25 | Joseph Castello | 14 | Son | — | Pennsylvania |
| 26 | Rose Mary Castello | 12 | Daughter | — | Pennsylvania |
| 27 | Margaret Castello | 10 | Daughter | — | Pennsylvania |
| 28 | Mary Lou Castello | 8 | Daughter | — | Pennsylvania |
| 29 | Charles Castello | 5 | Son | — | Pennsylvania |
| 30 | Alice Castello | 4 | Daughter | — | Pennsylvania |
| 31 | Edward Castello | 2 | Son | — | Pennsylvania |
| 32 | Charles Brennan | 51 | Head | Laborer | Pennsylvania |
| 33 | Anna Brennan | 51 | Wife | — | Pennsylvania |
| 34 | John Brennan THIS PERSON | 27 | Son | Laborer | Pennsylvania |
| 35 | Charles Jr. Brennan | 26 | Son | — | Pennsylvania |
| 36 | Aloisius Brennan | 18 | Son | — | Pennsylvania |
| 37 | Francis Brennan | 16 | Son | — | Pennsylvania |
| 38 | Rita Brennan | 11 | Daughter | — | Pennsylvania |
| 39 | Helen Sherman | 50 | Head | Janitress | Pennsylvania |
| 40 | Anna Sherman | 23 | Daughter | Stenographer | Pennsylvania |
Pedigree Summary
John + 4 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)