WB
William Brennan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Mercer-County, New Jersey
Our Model Tree links this William Brennan across the 1920, 1930 and 1940 US Censuses in Mercer-County, New Jersey (XGBoost, ~Confirmed), with identified parents John & Florence — first a son (b.~1911), then head of a 3-person household.
Age 29
b. ~1911
Male
Son
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Mercer-County, New Jersey |
| Surname | Brennan |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Trenton City |
| 1935 Residence (County) | Mercer |
| Additional Details | |
| Occupation | Rodman |
| Industry | Surveying Project |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 860 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Occupation | Rodman |
| Township / Ward | Trenton City |
| Est. Birth Year | ~1911 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Marilyn Brennan | Daughter | — | 11 | ~1929 |
| Florence Brennan | Head | — | 52 | ~1888 |
| William Brennan | Son | — | 29 | ~1911 |
Census Appearances
1920
Mercer, New …
Son, age 8
Mercer, New Jersey · implied b. ~1912 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Mercer, New …
Son, age 18
Mercer, New Jersey · implied b. ~1912 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | William M. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Mercer-County, New …
Son, age 29
Mercer-County, New Jersey · implied b. ~1911 — 3 household members
| Surname | Brennan |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Trenton City |
| 1935 Residence (County) | Mercer |
| Occupation | Rodman |
| Industry | Surveying Project |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 860 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 William Brennan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Brennan (~0.92 confidence) and mother Florence Brennan (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Brennan
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Florence Brennan
b. ~1888
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Brennan
Son · 1940 · age 29 · b. ~1911 · New Jersey
★ You are viewing this record
Sibling
Marilyn 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 — Mercer-County, New Jersey
Open full size
1940 US Federal Census — Mercer-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02436-00535)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | William Ferdinand | 17 | Son | — | New Jersey |
| 42 | Christine Faldenger | 67 | Head | — | Yugoslavia |
| 43 | Elsie Faldenger | 34 | Daughter | Bookkeeper | New Jersey |
| 44 | Joel Mientes | 45 | Head | Salesman | Poland |
| 45 | Sarah Mientes | 39 | Wife | — | Poland |
| 46 | Eleanor Mientes | 13 | Daughter | — | New Jersey |
| 47 | Henry Kobrin | 29 | Son in law | — | Poland |
| 48 | Rosie Kobrin | 38 | Daughter | Auto Buyer | Poland |
| 49 | Merton F. Vagbolt | 29 | Head | Sanitary Inspector | Pennsylvania |
| 50 | Catherine Vagbolt | 26 | Wife | — | Pennsylvania |
| 51 | William Ricks | 31 | Head | Correspondent | New Jersey |
| 52 | Jane Ricks | 26 | Wife | Typist | New Jersey |
| 53 | Leon Morrissey | 36 | Head | Pharmacist | New Jersey |
| 54 | Geraldine Morrissey | 36 | Wife | — | Pennsylvania |
| 55 | Agnes Morrissey | 7 | Daughter | — | New Jersey |
| 56 | William Danbury | 42 | Head | Locomotive Fireman | New Jersey |
| 57 | Katherine Danbury | 42 | Wife | — | New Jersey |
| 58 | William Jr. Danbury | 17 | Son | Errand Boy | New Jersey |
| 59 | Robert Danbury | 15 | Son | — | New Jersey |
| 60 | Eileen Danbury | 12 | Daughter | — | New Jersey |
| 61 | Joyce Danbury | 8 | Daughter | — | New Jersey |
| 62 | Stephen Vreda | 65 | Head | Factory Gardener | Hungary |
| 63 | Julia Vreda | 51 | Wife | Cigar Maker | Hungary |
| 64 | William Heddus | 21 | Step son | — | New Jersey |
| 65 | Edna C. Smith | 45 | Head | Stenographer | New Jersey |
| 66 | Emma D. Smith | 73 | Mother | — | Pennsylvania |
| 67 | Victoria Frabanes | 64 | Head | — | Italy |
| 68 | Peter Frabanes | 29 | Son | Floor Man | Germany |
| 69 | Victor Frabanes | 27 | Son | Dress Manufacturer | Germany |
| 70 | Anthony Francisco | 40 | Head | Groundsman Mechanic | Italy |
| 71 | Mary Francisco | 32 | Wife | Machine Oper | Italy |
| 72 | Joseph Francisco | 22 | Brother | Baker | New Jersey |
| 73 | Matilda Francisco | 25 | Sister | Machine Oper | New Jersey |
| 74 | Cinzia Francisco | 65 | Mother | — | Italy |
| 75 | Florence Brennan | 52 | Head | — | New Jersey |
| 76 | William Brennan THIS PERSON | 29 | Son | Rodman | New Jersey |
| 77 | Marilyn Brennan | 11 | Daughter | — | New Jersey |
| 78 | John Corbitt | 43 | Head | Store Manager | New Jersey |
| 79 | Josephine Corbitt | 38 | Wife | — | Italy |
| 80 | John Corbitt | 21 | Son | — | New Jersey |
Pedigree Summary
William + 1 sibling
Gen 1 · 2 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)