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.~1924), then head of a 8-person household.
Age 16
b. ~1924
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 | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | New worker |
| Hours Worked | 30 |
| Income (1939) | 0 |
| Highest Grade | H-1 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | New Worker |
| Township / Ward | Boston City |
| Est. Birth Year | ~1924 |
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 |
|---|---|---|---|---|
| Phyllis Costa | Daughter | — | 28 | ~1912 |
| Mary Costa | Daughter | — | 16 | ~1924 |
| Ralph Costa | Son | — | 11 | ~1929 |
| Philip Costa | Son | — | 15 | ~1925 |
| Vincenzo Costa | Head | — | 58 | ~1882 |
| Lillian Costa | Daughter | — | 17 | ~1923 |
| Lordoria Costa | Spouse | — | 47 | ~1893 |
| Anna Costa | Daughter | — | 26 | ~1914 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 6
Suffolk, Massachusetts · implied b. ~1924 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costa |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Italy |
| Mother's Birthplace | Italy |
| Occupation | none |
| Can Read/Write | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 16
Suffolk-County, Massachusetts · implied b. ~1924 — 8 household members
| Surname | Costa |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Occupation | New worker |
| Hours Worked | 30 |
| Income (1939) | 0 |
| Highest Grade | H-1 |
| 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 16 · b. ~1924 · Massachusetts
★ You are viewing this record
Sibling
Lillian Costa
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ralph Costa
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Costa
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Phyllis Costa
Sibling · 1940 · age 28
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Philip Costa
Sibling · 1940 · age 15
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-t0627-01660-00018)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Vincenzo Costa | 58 | Head | — | Italy |
| 2 | Lordoria Costa | 47 | Wife | — | Italy |
| 3 | Phyllis Costa | 28 | daughter | Dipper | Italy |
| 4 | Anna Costa | 26 | daughter | Dipper | Italy |
| 5 | Lillian Costa | 17 | daughter | New Worker | Massachusetts |
| 6 | Mary Costa THIS PERSON | 16 | daughter | New Worker | Massachusetts |
| 7 | Philip Costa | 15 | Son | — | Massachusetts |
| 8 | Ralph Costa | 11 | Son | — | Massachusetts |
| 9 | Vincent Fasoli | 50 | Head | — | Italy |
| 10 | Mary Fasoli | 39 | wife | — | Massachusetts |
| 11 | Mary Fasoli | 19 | daughter | Presser | Massachusetts |
| 12 | Dominic Fasoli | 16 | Son | — | Massachusetts |
| 13 | Frank Fasoli | 15 | Son | — | Massachusetts |
| 14 | Louisa Fasoli | 10 | daughter | — | Massachusetts |
| 15 | Albert Passacantilli | 22 | Head | Shipper | Massachusetts |
| 16 | Josephine Passacantilli | 22 | Wife | Seamstress | Italy |
| 17 | Vincent Amicangelo | 28 | Head | Teacher | Massachusetts |
| 18 | Mildred Amicangelo | 23 | Wife | — | Massachusetts |
| 19 | Vincenzo Amicangelo | 2 | Son | — | Massachusetts |
| 20 | Federico Crognale | 39 | Head | Plasterer | Italy |
| 21 | Anna Crognale | 36 | Wife | — | Italy |
| 22 | Mary Crognale | 16 | daughter | — | Italy |
| 23 | Clora Crognale | 13 | daughter | — | Italy |
| 24 | Annette Crognale | 1 | daughter | — | Massachusetts |
| 25 | Susi Arangelo | 62 | Lodger | Laborer | Italy |
| 26 | Carmine Bruno | 38 | Lodger | Laborer | Italy |
| 27 | Charles Di Mascio | 52 | Lodger | Cement Finisher | Italy |
| 28 | Domenico Di Pietro | 26 | Lodger | Laborer | Italy |
| 29 | Silvester Derbans | 26 | Head | Truck Driver | Massachusetts |
| 30 | Rita Derbans | 24 | Wife | — | Massachusetts |
| 31 | Joseph Derbans | 1 | Son | — | Massachusetts |
| 32 | Lucia Forte | 56 | Head | — | Italy |
| 33 | Ernest Forte | 30 | Son | Stock Fitting | Massachusetts |
| 34 | Erminia Forte | 28 | daughter | Checker | Massachusetts |
| 35 | Ottavio Forte | 25 | Son | Odd Man | Massachusetts |
| 36 | Olga Forte | 23 | daughter | Stitcher | Massachusetts |
| 37 | Edna Forte | 22 | daughter | Cutter | Massachusetts |
| 38 | Ugo Forte | 19 | Son | Delivery Boy | Massachusetts |
| 39 | Annibale Forte | 15 | Son | — | Massachusetts |
| 40 | Philip Casoli | 40 | Head | Bed Laster | Italy |
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)