MC
Mary Costello — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Hudson-County, New Jersey
Our Model Tree links this Mary Costello across the 1930 and 1940 US Censuses in Hudson-County, New Jersey (XGBoost, ~Confirmed) — first a daughter (b.~1921), then head of a 9-person household.
Age 19
b. ~1921
Female
Daughter
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hudson-County, New Jersey |
| Surname | Costello |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Jersey City |
| 1935 Residence (County) | Hudson |
| Additional Details | |
| Occupation | Salesgirl |
| Industry | 5-10 Store |
| Class of Worker | PW |
| Hours Worked | 10 |
| Income (1939) | 18 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Occupation | Salesgirl |
| Township / Ward | Jersey City |
| Est. Birth Year | ~1921 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Margaret Costello | Daughter | — | 8 | ~1932 |
| Mary Costello | Daughter | — | 19 | ~1921 |
| Anna Costello | Daughter | — | 14 | ~1926 |
| Rose Costello | Daughter | — | 24 | ~1916 |
| Louis Costello | Head | — | 50 | ~1890 |
| Joseph Costello | Son | — | 6 | ~1934 |
| Louis Costello | Son | — | 16 | ~1924 |
| Charles Costello | Son | — | 23 | ~1917 |
| Anna Costello | Spouse | — | 48 | ~1892 |
Census Appearances
1930
Hudson, New …
Daughter, age 9
Hudson, New Jersey · implied b. ~1921 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Castellano |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Italy |
| Mother's Birthplace | Italy |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Hudson-County, New …
Daughter, age 19
Hudson-County, New Jersey · implied b. ~1921 — 9 household members
| Surname | Costello |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Jersey City |
| 1935 Residence (County) | Hudson |
| Occupation | Salesgirl |
| Industry | 5-10 Store |
| Class of Worker | PW |
| Hours Worked | 10 |
| Income (1939) | 18 |
| Highest Grade | No 8 |
| 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 Costello across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Costello
Daughter · 1940 · age 19 · b. ~1921 · New Jersey
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Sibling
Charles Costello
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Costello
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Costello
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Costello
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rose Costello
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Louis Costello
Sibling · 1940 · age 16
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-t0627-02405-00057)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John Hoys | 47 | Head | Fireman | Pa. |
| 42 | Rose Hoys | 44 | Wife | — | Germany |
| 43 | John Hoys | 19 | Son | Pin Boy | New Jersey |
| 44 | Helen Hoys | 16 | Daughter | — | New Jersey |
| 45 | Andrew Hoys | 14 | Son | — | New Jersey |
| 46 | Peter Hoys | 4 | Son | — | New Jersey |
| 47 | Louis Costello | 50 | Head | Salesman | Italy |
| 48 | Anna Costello | 48 | Wife | — | Italy |
| 49 | Rose Costello | 24 | Daughter | Operator | New Jersey |
| 50 | Charles Costello | 23 | Son | Salesman | New Jersey |
| 51 | Mary Costello THIS PERSON | 19 | Daughter | Salesgirl | New Jersey |
| 52 | Louis Costello | 16 | Son | New Worker | New Jersey |
| 53 | Anna Costello | 14 | Daughter | — | New Jersey |
| 54 | Margaret Costello | 8 | Daughter | — | New Jersey |
| 55 | Joseph Costello | 6 | Son | — | New Jersey |
| 56 | Charles Nanco | 44 | Head | Salesman | New York |
| 57 | Elizabeth Nanco | 31 | Wife | — | New York |
| 58 | Louis Nanco | 11 | Son | — | New Jersey |
| 59 | Charles Nanco | 6 | Son | — | New Jersey |
| 60 | Rose Nanco | 72 | Mother | — | Italy |
| 61 | Louis Musante | 57 | Head | — | New York |
| 62 | Adelaide Musante | 53 | Wife | — | Italy |
| 63 | Angelo Musante | 29 | Son | Landscaper | New Jersey |
| 64 | Louis Musante | 26 | Son | — | New Jersey |
| 65 | Peter D. Massoline | 53 | Head | Proprietor | Italy |
| 66 | Victoria Massoline | 45 | Wife | Designer | New York |
| 67 | Anna Massoline | 18 | Daughter | New Worker | New Jersey |
| 68 | Felix Mccrown | 40 | Head | Elev. Operator | Ireland |
| 69 | Theresa Mccrown | 42 | Wife | — | Scotland |
| 70 | John Mccrown | 15 | Son | — | Canada |
| 71 | James Baker | 46 | Head | Steam Fitter | England |
| 72 | Jessie Baker | 44 | Wife | — | Missouri |
| 73 | John E. Baker | 21 | Son | — | New Jersey |
| 74 | Dorothy Baker | 19 | Daughter | Stenographer | Canada |
| 75 | Marjorie Baker | 14 | Daughter | — | New Jersey |
| 76 | Sven Anderson | 34 | Head | Accountant | Sweden |
| 77 | Anna Anderson | 63 | Mother | — | Sweden |
| 78 | Morris Goretzky | 49 | Head | Salesman | Russia |
| 79 | Pauline Goretzky | 47 | Wife | — | Russia |
| 80 | Anita Goretzky | 20 | Daughter | — | New Jersey |
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)