MC
Mary Costa — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, Massachusetts
Our Model Tree links this Mary Costa across the 1930 and 1940 US Censuses in Essex-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1921), then head of a 10-person household.
Age 19
b. ~1921
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, Massachusetts |
| Surname | Costa |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Beverly City |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Occupation | Mattress stitcher |
| Industry | Mattress Factory |
| Class of Worker | PW |
| Hours Worked | 18 |
| Income (1939) | 50 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Mattress Stitcher |
| Township / Ward | Beverly 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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Catherine Costa | Spouse | — | 42 | ~1898 |
| Santa Costa | Daughter | — | 16 | ~1924 |
| Mary Costa | Daughter | — | 19 | ~1921 |
| Josephine Costa | Daughter | — | 21 | ~1919 |
| Orazio Costa | Son | — | 25 | ~1915 |
| John Costa | Head | — | 52 | ~1888 |
| Bartholomew Costa | Son | — | 8 | ~1932 |
| John Costa | Son | — | 22 | ~1918 |
| Frank Costa | Son | — | 14 | ~1926 |
| Nancy Costa | Daughter | — | 24 | ~1916 |
Census Appearances
1930
Essex, Massachusetts
Daughter, age 8
Essex, Massachusetts · implied b. ~1922 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costa |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Italy |
| Mother's Birthplace | Italy |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Essex-County, Massachusetts
Daughter, age 19
Essex-County, Massachusetts · implied b. ~1921 — 10 household members
| Surname | Costa |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Beverly City |
| 1935 Residence (County) | Essex |
| Occupation | Mattress stitcher |
| Industry | Mattress Factory |
| Class of Worker | PW |
| Hours Worked | 18 |
| Income (1939) | 50 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Costa across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Costa
Daughter · 1940 · age 19 · b. ~1921 · Massachusetts
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Sibling
John Costa
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Santa Costa
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Orazio Costa
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Costa
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nancy Costa
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Josephine Costa
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bartholomew Costa
Sibling · 1940 · age 8
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, Massachusetts
Open full size
1940 US Federal Census — Essex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01577-00730)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Elizabeth B Cafozzi | 13 | daughter | — | Massachusetts |
| 2 | Allen F Obery | 51 | head | Installer | Massachusetts |
| 3 | Grace F Q Obery | 43 | wife | — | Massachusetts |
| 4 | Dorothy E Obery | 27 | daughter | New Worker | Massachusetts |
| 5 | Judith A Obery | 5 | daughter | — | Massachusetts |
| 6 | Ralph W B Smith | 27 | head | Radio Technician | ? |
| 7 | Gladys J Smith | 22 | wife | — | Massachusetts |
| 8 | Richard W Smith | 2 | son | — | Massachusetts |
| 9 | Ralph E Smith | 1 | son | — | Massachusetts |
| 10 | Merlin J Main | 47 | head | Mechanic | Maine |
| 11 | Daisy W B Main | 50 | wife | — | England |
| 12 | Marguerite O Main | 16 | daughter | — | Massachusetts |
| 13 | Jay A B Bartley | 36 | head | Wood Patent | England |
| 14 | Katherine B Bartley | 28 | wife | — | Massachusetts |
| 15 | Barbara J Bartley | 6 | daughter | — | Massachusetts |
| 16 | Rita E Bartley | 3 | daughter | — | Massachusetts |
| 17 | John Costa | 52 | head | Machinist | Italy |
| 18 | Catherine B Costa | 42 | wife | — | Italy |
| 19 | Nancy B Costa | 24 | daughter | Leather Scourer | Massachusetts |
| 20 | Orazio Costa | 25 | son | Mattress Stuffer | Massachusetts |
| 21 | John B Costa | 22 | son | Mattress Stuffer | Massachusetts |
| 22 | Josephine Costa | 21 | daughter | Mattress Stitcher | Massachusetts |
| 23 | Mary Costa THIS PERSON | 19 | daughter | Mattress Stitcher | Massachusetts |
| 24 | Santa Costa | 16 | daughter | — | Massachusetts |
| 25 | Frank Costa | 14 | son | — | Massachusetts |
| 26 | Bartholomew Costa | 8 | son | — | Massachusetts |
| 27 | John B Vellenuza | 57 | head | Laborer | Italy |
| 28 | Annie Vellenuza | 48 | wife | — | Italy |
| 29 | Guy Vellenuza | 29 | son | Laborer | Massachusetts |
| 30 | Orazio Vellenuza | 27 | son | Assembler | Massachusetts |
| 31 | Frank Vellenuza | 25 | son | Assembler | Massachusetts |
| 32 | Peter Vellenuza | 23 | son | Plumber Aid | Massachusetts |
| 33 | Edwin H Venderberg | 59 | head | Machine Painter | Sweden |
| 34 | Florence E B Venderberg | 58 | wife | — | Massachusetts |
| 35 | Helen E Venderberg | 34 | daughter | Telephone Oper. | Massachusetts |
| 36 | Edwin J Venderberg | 30 | son | Truck Driver | Massachusetts |
| 37 | Edith D Venderberg | 24 | daughter | Saleslady | Massachusetts |
| 38 | John J B Donovan | 47 | lodger | Watchman | Massachusetts |
| 39 | Charles A Morse | 25 | head | Accountant | Massachusetts |
| 40 | Luella A B Morse | 25 | wife | — | Massachusetts |
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)