MC
Mary Costa — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Bristol-County, Massachusetts
Our Model Tree links this Mary Costa across the 1930 and 1940 US Censuses in Bristol-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1918), then head of a 8-person household.
Age 22
b. ~1918
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Bristol-County, Massachusetts |
| Surname | Costa |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Fall River |
| 1935 Residence (County) | Bristol |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Fall River |
| Est. Birth Year | ~1918 |
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 |
|---|---|---|---|---|
| Bernadette Costa | Daughter | — | 4 | ~1936 |
| John Costa | Son | — | 30 | ~1910 |
| Mary Costa | Spouse | — | 48 | ~1892 |
| Manuel Costa | Son | — | 21 | ~1919 |
| Joseph Costa | Son | — | 25 | ~1915 |
| Mary Costa | Daughter | — | 22 | ~1918 |
| Americo Costa | Head | — | 64 | ~1876 |
| Amancio Costa | Son | — | 27 | ~1913 |
Census Appearances
1930
Bristol, Massachusetts
Daughter, age 11
Bristol, Massachusetts · implied b. ~1919 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costa |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Azores |
| Mother's Birthplace | Azores |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Bristol-County, Massachusetts
Daughter, age 22
Bristol-County, Massachusetts · implied b. ~1918 — 8 household members
| Surname | Costa |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Fall River |
| 1935 Residence (County) | Bristol |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 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 22 · b. ~1918 · Massachusetts
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Sibling
Bernadette Costa
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Costa
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Amancio Costa
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Costa
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Manuel Costa
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 — Bristol-County, Massachusetts
Open full size
1940 US Federal Census — Bristol-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01689-00377)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Francis Giroux | 50 | Head | — | Massachusetts |
| 2 | Maude Giroux | 26 | Wife | Chauffeur | Massachusetts |
| 3 | Julietta Giroux | 7 | Daughter | Dress Maker | Massachusetts |
| 4 | Thomas Giroux | 7 | Grandson | — | Massachusetts |
| 5 | Albert Giroux | 5 | Grandson | — | Massachusetts |
| 6 | Vivian Giroux | 1 | Granddaughter | — | Massachusetts |
| 7 | Donat Caron | 55 | Boarder | — | Massachusetts |
| 8 | Americo Costa | 64 | Head | — | Portugal |
| 9 | Mary Costa | 48 | Wife | Dress Maker | Portugal |
| 10 | John Costa | 30 | Son | Salesman | Massachusetts |
| 11 | Amancio Costa | 27 | Son | Truck Driver | Massachusetts |
| 12 | Joseph Costa | 25 | Son | Floor Walker | Massachusetts |
| 13 | Manuel Costa | 21 | Son | Bell Hop | Portugal |
| 14 | Mary Costa THIS PERSON | 22 | Daughter | — | Massachusetts |
| 15 | Bernadette Costa | 4 | Daughter | — | Massachusetts |
| 16 | John Kaplan | 72 | Head | — | Russia |
| 17 | Hattie Kaplan | 70 | Wife | — | Russia |
| 18 | Marion Kaplan | 47 | Daughter | Trimmer | Russia |
| 19 | Arthur Chabot | 62 | Head | Room Fixer | Massachusetts |
| 20 | Roseanna Chabot | 57 | Wife | — | Massachusetts |
| 21 | Alexander Chabot | 23 | Son | Weaver | Massachusetts |
| 22 | Lorraine Chabot | 17 | Daughter | Power Machine Operator | Massachusetts |
| 23 | Bertha Noel | 27 | Daughter | Trimmer | Massachusetts |
| 24 | Yveth Noel | 3 | Granddaughter | — | Massachusetts |
| 25 | Thomas Burke | 56 | Head | Operator | Massachusetts |
| 26 | Eda Burke | 50 | Wife | — | Massachusetts |
| 27 | Irene Burke | 25 | Daughter | Cone Winder | Massachusetts |
| 28 | Alice Burke | 23 | Daughter | — | Massachusetts |
| 29 | Enda Burke | 12 | Daughter | — | Massachusetts |
| 30 | Marie Lavallee | 81 | Mother-in-law | — | Canada French |
| 31 | David Prudman | 66 | Head | Salesman | Russia |
| 32 | Fannie Prudman | 56 | Wife | — | Russia |
| 33 | Clara Prudman | 31 | Daughter | Teacher | Massachusetts |
| 34 | Bella Prudman | 25 | Daughter | Social Worker | Massachusetts |
| 35 | Helen Prudman | 23 | Daughter | Stenographer | Massachusetts |
| 36 | Leonard Prudman | 18 | Son | — | Massachusetts |
| 37 | Alfred Bernier | 48 | Head | Doffer | Canada French |
| 38 | Alice Bernier | 47 | Wife | — | Canada French |
| 39 | Roland Bernier | 16 | Son | — | Massachusetts |
| 40 | Roger Bernier | 14 | Son | — | 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)