MC
Mary Cox — 1940 US Census Record
Model Tree available1940 United States Federal Census · Hudson-County, New Jersey
Our Model Tree links this Mary Cox across the 1920, 1930 and 1940 US Censuses in Hudson-County, New Jersey (XGBoost, ~Confirmed), with identified parents William & John — first a daughter (b.~1916), then head of a 4-person household.
Age 24
b. ~1916
Female
Daughter
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hudson-County, New Jersey |
| Surname | Cox |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Jersey City |
| 1935 Residence (County) | Hudson |
| Additional Details | |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Jersey City |
| Est. Birth Year | ~1916 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Cox | Daughter | — | 24 | ~1916 |
| William Cox | Head | — | 58 | ~1882 |
| James Cox | Son | — | 21 | ~1919 |
| Theresa Cox | Spouse | — | 57 | ~1883 |
Census Appearances
1920
Hudson, New …
Daughter, age 3
Hudson, New Jersey · implied b. ~1917 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Hudson, New …
Daughter, age 14
Hudson, New Jersey · implied b. ~1916 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Hudson-County, New …
Daughter, age 24
Hudson-County, New Jersey · implied b. ~1916 — 4 household members
| Surname | Cox |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Jersey City |
| 1935 Residence (County) | Hudson |
| Highest Grade | Hs 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 Mary Cox across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father William Cox (~0.92 confidence) and father John Cox (~0.92 confidence) and father William Cox (~0.92 confidence) and mother Theresa Cox (~0.92 confidence) and mother Theresa Cox (~0.92 confidence) and mother Ida Cox (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
William Cox
b. ~1879
Source father
● Household
· direct · ~0.92
Father
John Cox
b. ~1881
Source father
● Household
· direct · ~0.92
Father
William Cox
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
Theresa Cox
b. ~1883
Source mother
● Household
· direct · ~0.92
Mother
Theresa Cox
b. ~1885
Source mother
● Household
· direct · ~0.92
Mother
Ida Cox
b. ~1893
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Cox
Daughter · 1940 · age 24 · b. ~1916 · New Jersey
★ You are viewing this record
Sibling
James Cox
Sibling · 1940 · age 21
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 — Hudson-County, New Jersey
Open full size
1940 US Federal Census — Hudson-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02409-00219)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Loza | 21 | Son | Laborer | New Jersey |
| 2 | Helen Loza | 20 | Daughter | Laborer | New Jersey |
| 3 | Ann Loza | 16 | Daughter | — | New Jersey |
| 4 | Walter Loza | 14 | Son | — | New Jersey |
| 5 | Stanley Loza | 9 | Son | — | New Jersey |
| 6 | Catherine Czarnecka | 51 | Head | — | Poland |
| 7 | Stanley Czarnecka | 26 | Son | Machinist | New Jersey |
| 8 | Mary Pylka | 24 | Daughter | Stenographer | New Jersey |
| 9 | Carol Pylka | 25 | Son-in-law | Printer | Poland |
| 10 | Joseph Pylka | 1 | Grandson | — | New Jersey |
| 11 | William Cox | 58 | Head | Watchman | New Jersey |
| 12 | Theresa Cox | 57 | Wife | — | New Jersey |
| 13 | Mary Cox THIS PERSON | 24 | Daughter | — | New Jersey |
| 14 | James Cox | 21 | Son | Laborer | New Jersey |
| 15 | Charles Thumm | 39 | Head | Policeman | New Jersey |
| 16 | Viola B Thumm | 35 | Wife | — | New York |
| 17 | Audry Thumm | 12 | Son | — | New Jersey |
| 18 | Mary V Thumm | 5 | Daughter | — | New Jersey |
| 19 | Charles Thumm | 3 | Son | — | New Jersey |
| 20 | Loretta Wagner | 62 | Mother-in-law | Laborer | New York |
| 21 | Walter Griffin | 46 | Head | Reactor | New Jersey |
| 22 | Josephine Griffin | 43 | Wife | — | New Jersey |
| 23 | Walter Jr Griffin | 20 | Son | Improver | New Jersey |
| 24 | Lucille Griffin | 18 | Daughter | — | New Jersey |
| 25 | George Mcdonald | 40 | Head | Trainman | Canada |
| 26 | Adele Mcdonald | 38 | Wife | — | New York |
| 27 | George Jr Mcdonald | 9 | Son | — | New Jersey |
| 28 | Louis Mcdonald | 5 | Son | — | New Jersey |
| 29 | William Weber | 46 | Head | Long Shoreman | New Jersey |
| 30 | Elizabeth Weber | 44 | Wife | — | New York |
| 31 | Harriet Weber | 26 | Daughter | Clerk | New Jersey |
| 32 | Elizabeth Weber | 13 | Daughter | — | New Jersey |
| 33 | Arthur Chiarot | 41 | Head | Cook | Italy |
| 34 | Fanny Chiarot | 34 | Wife | Inspector | Italy |
| 35 | Arthur Jr Chiarot | 6 | Son | — | New Jersey |
| 36 | Sara Curley | 55 | Head | — | New York |
| 37 | Thomas Curley | 33 | Son | Interviewer | New Jersey |
| 38 | Joseph Curley | 25 | Son | Teller | New Jersey |
| 39 | John Curley | 23 | Son | Clerk | New Jersey |
| 40 | George Knight | 53 | Head | Diver | Ireland |
Pedigree Summary
Mary + 1 sibling
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)