MC
Mary Costa — 1920 US Census Record
Linked across censuses1920 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this Mary Costa across the 1910 and 1920 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1879), then head of a 10-person household.
Age 41
b. ~1879
Female
Spouse
Born: Portugal
Married
1920 Census Record Details
| Census Year | 1920 |
| Location | Middlesex, Massachusetts |
| Surname | Costa |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Portugal |
| Year of Immigration | 1891 |
| Naturalization Status | Alien |
| Father's Birthplace | Portugal |
| Mother's Birthplace | Portugal |
| Additional Details | |
| Can Read | No |
| Can Write | No |
| Speaks English | No |
| Mother Tongue | Portuguese |
| Birth Country | Portugal |
| Birthplace (normalized) | portugal |
| Township / Ward | Cambridge City |
| Est. Birth Year | ~1879 |
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 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| John Costa | Son | — | 21 | ~1899 |
| Mary Costa | Spouse | — | 41 | ~1879 |
| Julia Costa | Daughter | — | 2 | ~1918 |
| Joseph Costa | Son | — | 22 | ~1898 |
| Mary Costa | Daughter | — | 7 | ~1913 |
| Frank Costa | Son | — | 16 | ~1904 |
| Manuel Costa | Son | — | 14 | ~1906 |
| Antonio Costa | Son | — | 10 | ~1910 |
| Sophie Costa | Daughter | — | 5 | ~1915 |
| Joseph Costa | Head | — | 48 | ~1872 |
Census Appearances
1910
Bristol, Massachusetts
Spouse, age 30
Bristol, Massachusetts · implied b. ~1880 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costa |
| Given Name | Mary S. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Portugal |
| Years Married | 11 |
| Children Born | 7 |
| Children Living | 7 |
| Year of Immigration | 1890 |
| Father's Birthplace | Portugal |
| Mother's Birthplace | Portugal |
| Birth Country | Portugal |
| Birthplace (normalized) | portugal |
1920
Middlesex, Massachusetts
Spouse, age 41
Middlesex, Massachusetts · implied b. ~1879 — 10 household members
| Surname | Costa |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Portugal |
| Year of Immigration | 1891 |
| Naturalization Status | Alien |
| Father's Birthplace | Portugal |
| Mother's Birthplace | Portugal |
| Can Read | No |
| Can Write | No |
| Speaks English | No |
| Mother Tongue | Portuguese |
| Birth Country | Portugal |
| Birthplace (normalized) | portugal |
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 (1910 and 1920) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Costa
Spouse · 1920 · age 41 · b. ~1879 · Massachusetts
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1920 US Federal Census — Middlesex, Massachusetts
Open full size
1920 US Federal Census — Middlesex, Massachusetts
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu707unit:0095)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Antonio Silva | 13 | Son | — | Massachusetts |
| 2 | John Louis | 34 | Head | Laborer | Portugal |
| 3 | Mary Louis | 30 | Wife | — | Portugal |
| 4 | Mary Louis | 7 | Daughter | — | Massachusetts |
| 5 | Dorothy Louis | 4 | Daughter | — | Massachusetts |
| 6 | Daniel Louis | 2 | Son | — | Massachusetts |
| 7 | Irene Louis | 0 | Daughter | — | Massachusetts |
| 8 | Manuel Fronis | 40 | Head | Laborer | Massachusetts |
| 9 | Felicia Fronis | 32 | Wife | — | Connecticut |
| 10 | John Fronis | 10 | Son | — | Connecticut |
| 11 | George Fronis | 8 | Son | — | Connecticut |
| 12 | Rose Fronis | 12 | Daughter | — | Connecticut |
| 13 | Edward Fronis | 7 | Son | — | Connecticut |
| 14 | Joseph Costa | 48 | Head | Laborer | Portugal |
| 15 | Mary Costa THIS PERSON | 41 | Wife | — | Portugal |
| 16 | Joseph Costa | 22 | Son | Laborer | Massachusetts |
| 17 | John Costa | 21 | Son | Laborer | Massachusetts |
| 18 | Frank Costa | 16 | Son | Laborer | Massachusetts |
| 19 | Manuel Costa | 14 | Son | — | Massachusetts |
| 20 | Antonio Costa | 10 | Son | — | Massachusetts |
| 21 | Mary Costa | 7 | Daughter | — | Massachusetts |
| 22 | Sophie Costa | 5 | Daughter | — | Massachusetts |
| 23 | Julia Costa | 2 | Daughter | — | Massachusetts |
| 24 | Manuel Everett | 28 | Head | Laborer | Portugal |
| 25 | Maria Everett | 28 | Wife | — | Portugal |
| 26 | Mary Everett | 3 | Daughter | — | Massachusetts |
| 27 | Sophie Everett | 2 | Daughter | — | Massachusetts |
| 28 | Sarah Thompson | 56 | Head | — | Ireland |
| 29 | Daniel E. Mcgrath | 60 | Head | Laborer | Massachusetts |
| 30 | John Mcgrath | 57 | Brother | Laborer | Massachusetts |
| 31 | Patrick Mcgrath | 52 | Brother | Laborer | Massachusetts |
| 32 | Michael Mcgrath | 48 | Brother | Laborer | Massachusetts |
| 33 | James Mcgrath | 46 | Brother | Laborer | Massachusetts |
| 34 | John Costa | 42 | Head | Laborer | Portugal |
| 35 | Mary Costa | 35 | Wife | — | Portugal |
| 36 | John Costa | 15 | Son | — | Massachusetts |
| 37 | Joseph Costa | 12 | Son | — | Massachusetts |
| 38 | Mary Costa | 8 | Daughter | — | Massachusetts |
| 39 | Antonio Brito | 36 | Head | Laborer | Portugal |
| 40 | Georgina Brito | 24 | Wife | — | Massachusetts |
| 41 | Joseph Brito | 5 | Son | — | Massachusetts |
| 42 | Victoria Brito | 3 | Daughter | — | Massachusetts |
| 43 | John Brito | 28 | Head | Laborer | Portugal |
| 44 | Mary Brito | 27 | Wife | — | Portugal |
| 45 | Mary Brito | 0 | Daughter | — | Massachusetts |
| 46 | John Mclean | 57 | Head | Laborer | Scotland |
| 47 | Mary Mclean | 50 | Wife | — | Ireland |
| 48 | John Medeiros | 35 | Head | Laborer | Portugal |
| 49 | Mary Medeiros | 30 | Wife | — | Portugal |
| 50 | John Medeiros | 12 | Son | — | Massachusetts |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)