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Mary Black — 1940 US Census Record
Model Tree available1940 United States Federal Census · Hudson-County, New Jersey
Our Model Tree links this Mary Black across the 1910, 1920, 1930 and 1940 US Censuses in Hudson-County, New Jersey (XGBoost, ~Confirmed), with identified parents Margaret & Thomas — first a head (b.~1900), then head of a 8-person household.
Age 40
b. ~1900
Female
Head
Born: New Jersey
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Hudson-County, New Jersey |
| Surname | Black |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Widowed |
| Birthplace | New Jersey |
| 1935 Residence (City) | Jersey City |
| 1935 Residence (County) | Hudson |
| Additional Details | |
| Occupation | Clerk |
| Industry | Printing Supplies |
| Class of Worker | PW |
| Hours Worked | 37 |
| Income (1939) | 1352 |
| Highest Grade | Hs 3 |
| 1935 Residence | Same house |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Occupation | Clerk |
| Township / Ward | Jersey City |
| Est. Birth Year | ~1900 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Black | Head | — | 40 | ~1900 |
| Sarah Black | Other | — | 36 | ~1904 |
| Tekla Libon | Other | — | 75 | ~1865 |
| Thomas Ronan | Son | — | 4 | ~1936 |
| Richard Ronan | Son | — | 6 | ~1934 |
| John Ronan | Son | — | 8 | ~1932 |
| John Ronan | Son | — | 46 | ~1894 |
| Anna Ronan | Spouse | — | 38 | ~1902 |
Census Appearances
Daughter, age 11
Hudson, New Jersey · implied b. ~1899 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Black |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1920
Hudson, New …
Daughter, age 20
Hudson, New Jersey · implied b. ~1900 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Black |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Auditor |
| Industry | Pipe Foundry |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Hudson, New …
Daughter, age 32
Hudson, New Jersey · implied b. ~1898 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Black |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Clerk |
| Industry | Amunition Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Hudson-County, New …
Head, age 40
Hudson-County, New Jersey · implied b. ~1900 — 8 household members
| Surname | Black |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Widowed |
| Birthplace | New Jersey |
| 1935 Residence (City) | Jersey City |
| 1935 Residence (County) | Hudson |
| Occupation | Clerk |
| Industry | Printing Supplies |
| Class of Worker | PW |
| Hours Worked | 37 |
| Income (1939) | 1352 |
| Highest Grade | Hs 3 |
| 1935 Residence | Same house |
| 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 Black across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Margaret Black (~0.92 confidence) and father Thomas Black (~0.92 confidence) and father Richard Black (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Margaret Black
b. ~1862
Source mother
● Household
· direct · ~0.92
Father
Thomas Black
b. ~1864
Source father
● Household
· direct · ~0.92
Father
Richard Black
b. ~1864
Source father
● Household
· direct · ~0.92
This person
Anchor record
Mary Black
Head · 1940 · age 40 · b. ~1900 · New Jersey
★ You are viewing this record
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-t0627-02403-00177)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Annie Fitzgerald | 63 | Head | 0 | New Jersey |
| 2 | James Fitzgerald | 26 | Son | Clerk | New Jersey |
| 3 | Henry Fitzgerald | 23 | Son | Clerk | New Jersey |
| 4 | Mary Black THIS PERSON | 40 | Head | Clerk | New Jersey |
| 5 | Sarah Black | 36 | Sister | Clerk | New Jersey |
| 6 | Tekla Libon | 75 | Mother | 0 | Germany |
| 7 | John Ronan | 46 | Son | Radio Mechanic | New Jersey |
| 8 | Anna Ronan | 38 | Wife | 0 | New Jersey |
| 9 | John Ronan | 8 | Son | — | Long Island |
| 10 | Richard Ronan | 6 | Son | — | Long Island |
| 11 | Thomas Ronan | 4 | Son | — | Long Island |
| 12 | Irene Wahl | 29 | Head | Clerk | New Jersey |
| 13 | Estelle Wahl | 27 | Partner | Clerk | New Jersey |
| 14 | Thomas B. Jr. O'Connor | 39 | Head | Passenger Conductor | New Jersey |
| 15 | Mary O'Connor | 35 | Wife | 0 | New Jersey |
| 16 | Catherine O'Connor | 40 | Daughter | Clerical | New Jersey |
| 17 | Rose O'Connor | 35 | Daughter | Clerk | New Jersey |
| 18 | Edward O'Connor | 31 | Son | 0 | New Jersey |
| 19 | Della Briody | 58 | Sister | 0 | New Jersey |
| 20 | Mela Malti | 74 | Lodger | 0 | Germany |
| 21 | Raymond Freed | 39 | Head | Police | Pennsylvania |
| 22 | Gladys Freed | 38 | Wife | 0 | Pennsylvania |
| 23 | William Freed | 20 | Son | 0 | New Jersey |
| 24 | Gladys Freed | 18 | Daughter | 0 | Penna. |
| 25 | Audley Freed | 15 | Daughter | 0 | New Jersey |
| 26 | Raymond Freed | 12 | Son | 0 | New Jersey |
| 27 | Lois Freed | 10 | Daughter | 0 | New Jersey |
| 28 | Gloria Freed | 8 | Daughter | 0 | New Jersey |
| 29 | Richard Freed | 5 | Son | 0 | New Jersey |
| 30 | Joan Freed | 3 | Daughter | 0 | New Jersey |
| 31 | Victor Freed | 0 | Son | 0 | New Jersey |
| 32 | James Lynch | 38 | Head | Pamphlet Distributor | New Jersey |
| 33 | Sadie Lynch | 34 | Wife | 0 | New Jersey |
| 34 | James Jr. Lynch | 13 | Son | 0 | New Jersey |
| 35 | Joan Lynch | 6 | Daughter | 0 | New Jersey |
| 36 | George Lynch | 3 | Son | 0 | New Jersey |
| 37 | Beverly Lynch | 0 | Daughter | 0 | New Jersey |
| 38 | Mabel Gibson | 51 | Head | 0 | New Jersey |
| 39 | Charles Weeks | 52 | Head | Iron Roller | Pennsylvania |
| 40 | Mary Weeks | 52 | Wife | 0 | New Jersey |
Related Census Records
Pedigree Summary
Mary
Gen 1 · 3 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)