MC
Mary Costa — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Mary Costa across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 10-person household.
Age 18
b. ~1922
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Costa |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | H 2 |
| 1935 Residence | Same Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City |
| Est. Birth Year | ~1922 |
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 |
|---|---|---|---|---|
| Anna Costa | Daughter | — | 15 | ~1925 |
| Josephine Costa | Daughter | — | 11 | ~1929 |
| Joseph Costa | Son | — | 1 | ~1939 |
| Head Costa | Other | — | — | |
| Mary Costa | Daughter | — | 18 | ~1922 |
| Grace Bellesta | Spouse | — | 45 | ~1895 |
| Salvatore Bellesta | Head | — | 41 | ~1899 |
| Antoinette Costa | Daughter | — | 3 | ~1937 |
| Rita Costa | Daughter | — | 8 | ~1932 |
| Jenny Costa | Spouse | — | 40 | ~1900 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 7
Suffolk, Massachusetts · implied b. ~1923 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costa |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Albania |
| Mother's Birthplace | Albania |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 18
Suffolk-County, Massachusetts · implied b. ~1922 — 10 household members
| Surname | Costa |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | H 2 |
| 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 18 · b. ~1922 · Massachusetts
★ You are viewing this record
Sibling
Anna Costa
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Antoinette Costa
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Costa
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rita Costa
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Josephine Costa
Sibling · 1940 · age 11
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 — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01660-00531)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Frank Novello | 49 | Head | Bricklayer | Italy |
| 42 | Prudence Novello | 44 | Wife | — | Italy |
| 43 | Frank Dreato | 64 | Head | Cabinet Maker | Italy |
| 44 | Grace Dreato | 61 | Wife | — | Italy |
| 45 | Helen Dreato | 29 | Daughter | Pencil Maker | Massachusetts |
| 46 | John Dreato | 24 | Son | Non Experienced | Massachusetts |
| 47 | Idilia Dreato | 22 | Daughter | Non Experienced | Massachusetts |
| 48 | Gloria Dreato | 17 | Daughter | — | Massachusetts |
| 49 | Pasquale Scolar | 54 | Head | Roofer | Italy |
| 50 | Mary Scolar | 48 | Wife | — | Italy |
| 51 | Vincent Scolar | 23 | Son | Printer | Massachusetts |
| 52 | Rosario Scolar | 20 | Son | Counter Helper | Massachusetts |
| 53 | Peter Scolar | 18 | Son | New Worker | Massachusetts |
| 54 | Dominic Scolar | 15 | Son | — | Massachusetts |
| 55 | Idalina Scolar | 14 | Daughter | — | Massachusetts |
| 56 | Anthony Scolar | 11 | Son | — | Massachusetts |
| 57 | Mary Scolar | 1 | Daughter | — | Massachusetts |
| 58 | Raffell Preziosi | 67 | Head | Photographer | Italy |
| 59 | Edith Preziosi | 29 | Daughter | Social Service | Massachusetts |
| 60 | Irma Preziosi | 25 | Daughter | Bookkeeper | Massachusetts |
| 61 | Idolo Preziosi | 23 | Daughter | Salesman | Massachusetts |
| 62 | Ines Preziosi | 20 | Daughter | — | Massachusetts |
| 63 | Antonio Sannazzaro | 58 | Head | Labourer | Italy |
| 64 | Carmella Sannazzaro | 46 | Wife | — | Italy |
| 65 | James Sannazzaro | 25 | Son | Truck Driver | Massachusetts |
| 66 | Margaret Sannazzaro | 23 | Daughter | Presser | Massachusetts |
| 67 | Louis Sannazzaro | 20 | Son | Salesman | Massachusetts |
| 68 | Toni Sannazzaro | 12 | Son | — | Massachusetts |
| 69 | Marcella Sannazzaro | 10 | Daughter | — | Massachusetts |
| 70 | Marcella Cafuerci | 72 | Head | — | Italy |
| 71 | Salvatore Bellesta | 41 | Head | Barber | Italy |
| 72 | Grace Bellesta | 45 | Wife | — | Camp Brighit |
| 73 | Head Costa | None | M | — | Al |
| 74 | Jenny Costa | 40 | Wife | Labourer | Italy |
| 75 | Mary Costa THIS PERSON | 18 | Daughter | — | Massachusetts |
| 76 | Anna Costa | 15 | Daughter | — | Massachusetts |
| 77 | Josephine Costa | 11 | Daughter | — | Massachusetts |
| 78 | Rita Costa | 8 | Daughter | — | Massachusetts |
| 79 | Antoinette Costa | 3 | Daughter | — | Massachusetts |
| 80 | Joseph Costa | 1 | 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)