MS
Mary Sweeney — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, New Jersey
Our Model Tree links this Mary Sweeney across the 1930 and 1940 US Censuses in Essex-County, New Jersey (XGBoost, ~Confirmed) — first a daughter (b.~1929), then head of a 14-person household.
Age 11
b. ~1929
Female
Daughter
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, New Jersey |
| Surname | Sweeney |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Newark city |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Highest Grade | 5 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Newark City |
| Est. Birth Year | ~1929 |
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.
14 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Sally Sweeney | Daughter | — | ~1940 | |
| Eleanor Sweeney | Daughter | — | 9 | ~1931 |
| Mary Sweeney | Daughter | — | 11 | ~1929 |
| Ann Sweeney | Daughter | — | 3 | ~1937 |
| Catherine Sweeney | Daughter | — | 13 | ~1927 |
| John Sweeney | Head | — | 45 | ~1895 |
| William Muckolland | Other | — | 53 | ~1887 |
| Paul Harves | Other | — | 39 | ~1901 |
| Patricia Sullivan | Other | — | 75 | ~1865 |
| William Muckolland | Other | — | 17 | ~1923 |
| John Sweeney | Son | — | 17 | ~1923 |
| Michael Sweeney | Son | — | 14 | ~1926 |
| Hugh Sweeney | Son | — | 7 | ~1933 |
| Nora Sweeney | Spouse | — | 41 | ~1899 |
Census Appearances
1930
Essex, New …
Daughter, age 1
Essex, New Jersey · implied b. ~1929 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sweeney |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Essex-County, New …
Daughter, age 11
Essex-County, New Jersey · implied b. ~1929 — 14 household members
| Surname | Sweeney |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Newark city |
| 1935 Residence (County) | Essex |
| Highest Grade | 5 |
| 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 Sweeney across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Sweeney
Daughter · 1940 · age 11 · b. ~1929 · New Jersey
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Sibling
Hugh Sweeney
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Sweeney
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sally Sweeney
Sibling · 1940 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ann Sweeney
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Sweeney
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Sweeney
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eleanor Sweeney
Sibling · 1940 · age 9
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 — Essex-County, New Jersey
Open full size
1940 US Federal Census — Essex-County, New Jersey
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-02421-00299)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Nickens | 47 | Wife | — | New Haven |
| 2 | Mary Nickens | 14 | Daughter | — | New Jersey |
| 3 | Bernice Nickens | 12 | Daughter | — | New Jersey |
| 4 | Albert Nickens | 11 | Son | — | New Jersey |
| 5 | Paul Nickens | 9 | Son | — | New Jersey |
| 6 | Jean Nickens | 8 | Daughter | — | New Jersey |
| 7 | Joseph Nickens | 7 | Son | — | New Jersey |
| 8 | John Nickens | 5 | Son | — | New Jersey |
| 9 | James Nickens | 3 | Son | — | New Jersey |
| 11 | Robert Johnston | 67 | Head | Driver | Conn. |
| 12 | Lillian Johnston | 62 | Wife | — | Orange |
| 13 | George Johnston | 38 | Son | Machinist | New Jersey |
| 14 | Stanley Johnston | 29 | Son | Helper | New Jersey |
| 15 | Walter Behring | 40 | Head | Laborer | Orange |
| 16 | Rebecca Behring | 36 | Wife | — | Brooklyn |
| 17 | Frances Behring | 10 | Daughter | — | New Jersey |
| 18 | Mary Farrand | 51 | Head | Seamstress | New Jersey |
| 19 | William Farrand | 23 | Son | — | New Jersey |
| 20 | Alfred Ertman | 45 | Head | Plumber | Poland |
| 21 | Eileen Ertman | 42 | Wife | — | New Jersey |
| 23 | Harry Herriger | 25 | Head | Clerical | New Jersey |
| 24 | Annastasia Herriger | 22 | Wife | — | New Jersey |
| 25 | Roy Herriger | 0 | Son | — | New Jersey |
| 26 | John Sweeney | 45 | Head | Salesman | Ireland |
| 27 | Nora Sweeney | 41 | Wife | — | Ireland |
| 28 | John Sweeney | 17 | Son | — | New Jersey |
| 29 | Michael Sweeney | 14 | Son | — | New Jersey |
| 30 | Catherine Sweeney | 13 | Daughter | — | New Jersey |
| 31 | Mary Sweeney THIS PERSON | 11 | Daughter | — | New Jersey |
| 32 | Eleanor Sweeney | 9 | Daughter | — | New Jersey |
| 33 | Hugh Sweeney | 7 | Son | — | New Jersey |
| 34 | Ann Sweeney | 3 | Daughter | — | New Jersey |
| 35 | Sally Sweeney | 0 | Daughter | — | New Jersey |
| 36 | Patricia Sullivan | 75 | Roomer | — | Ireland |
| 37 | William Muckolland | 53 | Roomer | — | Scotland |
| 38 | William Jr. Muckolland | 17 | Roomer | — | Orange |
| 39 | Paul Harves | 39 | Roomer | — | Ireland |
| 40 | Anderson Hardy | 49 | Head | Farmer | Virginia |
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)