MC
Mary Costello — 1920 US Census Record
Linked across censuses1920 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this Mary Costello across the 1920, 1930 and 1940 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1886), then head of a 3-person household.
Age 34
b. ~1886
Female
Spouse
Born: Maine
Married
1920 Census Record Details
| Census Year | 1920 |
| Location | Middlesex, Massachusetts |
| Surname | Costello |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Maine |
| Father's Birthplace | Maine |
| Mother's Birthplace | Maine |
| Additional Details | |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maine |
| Birth Country | United States |
| Birthplace (normalized) | maine |
| Township / Ward | Cambridge City |
| Est. Birth Year | ~1886 |
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.
3 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Ethel Costello | Daughter | — | 2 | ~1918 |
| John Costello | Head | — | 34 | ~1886 |
| Mary Costello | Spouse | — | 34 | ~1886 |
Census Appearances
1920
Middlesex, Massachusetts
Spouse, age 34
Middlesex, Massachusetts · implied b. ~1886 — 3 household members
| Surname | Costello |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Maine |
| Father's Birthplace | Maine |
| Mother's Birthplace | Maine |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maine |
| Birth Country | United States |
| Birthplace (normalized) | maine |
1930
Suffolk, Massachusetts
Spouse, age 44
Suffolk, Massachusetts · implied b. ~1886 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costello |
| Given Name | Martha A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Maine |
| Age at First Marriage | 29 |
| Father's Birthplace | Maine |
| Mother's Birthplace | New Brunswick |
| Occupation | At Home |
| Can Read/Write | Yes |
| Birth State | Maine |
| Birth Country | United States |
| Birthplace (normalized) | maine |
1940
Suffolk-County, Massachusetts
Spouse, age 54
Suffolk-County, Massachusetts · implied b. ~1886 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costello |
| Given Name | Martha H. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Maine |
| 1935 Residence (City) | City of Boston |
| 1935 Residence (County) | Suffolk |
| Occupation | Specialist |
| Industry | Public School |
| Class of Worker | OA |
| Hours Worked | 56 |
| Income (1939) | 533 |
| Highest Grade | H-4 |
| 1935 Residence | Same Place |
| Birth State | Maine |
| Birth Country | United States |
| Birthplace (normalized) | maine |
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 Costello across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Costello
Spouse · 1920 · age 34 · b. ~1886 · 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:1166)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Matthew Shea | 32 | Head | Dentist | Massachusetts |
| 52 | Charles Shea | 28 | Son | Printer | Massachusetts |
| 53 | Margaret Shea | 22 | Daughter | Operator | Massachusetts |
| 54 | Alice Shea | 21 | Daughter | Bookkeeper | Massachusetts |
| 55 | Grace Shea | 20 | Daughter | — | Massachusetts |
| 56 | Fannie M Hough | 36 | Daughter | Bookkeeper | Massachusetts |
| 57 | Leonard Hough | 13 | Grandson | — | New York |
| 58 | Catherine Hough | 6 | Granddaughter | — | New York |
| 59 | Mary E Halloran | 31 | Cousin | Bookkeeper | Massachusetts |
| 60 | Henry Clark | 59 | Head | Laborer | Massachusetts |
| 61 | Mary E Clark | 58 | Wife | — | Massachusetts |
| 62 | Agnes Clark | 27 | Daughter | — | Massachusetts |
| 63 | Catherine Connell | 48 | Boarder | Book Binder | Massachusetts |
| 64 | Hattie Wilson | 65 | Head | — | New York |
| 65 | Charles Wilson | 36 | Son | Commercial Traveler | New York |
| 66 | Sadie Wilson | 35 | Daughter in law | — | Canada |
| 67 | Charles Wilson | 11 | Grandson | — | Massachusetts |
| 68 | Floyd Wilson | 10 | Grandson | — | Massachusetts |
| 69 | Michael Cleary | 64 | Head | — | Ireland |
| 70 | Ellen Cleary | 66 | Wife | — | Ireland |
| 71 | Dennis Bourne | 35 | Head | Teamster | Massachusetts |
| 72 | Mary Bourne | 32 | Wife | — | Massachusetts |
| 73 | Gerald Bourne | 4 | Son | — | Massachusetts |
| 74 | Ruth Bourne | 2 | Daughter | — | Massachusetts |
| 75 | James De Luca | 45 | Head | Shoemaker | Italy |
| 76 | Augusta De Luca | 45 | Wife | — | Italy |
| 77 | Mary De Luca | 18 | Daughter | — | Italy |
| 78 | Joseph De Luca | 17 | Son | Shoemaker | Massachusetts |
| 79 | Anthony De Luca | 15 | Son | — | Massachusetts |
| 80 | Thomas De Luca | 11 | Son | — | Massachusetts |
| 81 | Michael De Luca | 10 | Son | — | Massachusetts |
| 82 | Yolanda De Luca | 8 | Daughter | — | Massachusetts |
| 83 | Esther De Luca | 7 | Daughter | — | Massachusetts |
| 84 | Clotilda De Luca | 4 | Daughter | — | Massachusetts |
| 85 | Mary O'Brien | 82 | Head | — | England |
| 86 | Mary O'Brien | 51 | Daughter | — | Ireland |
| 87 | John Gors | 22 | Nephew | Tire Maker | Massachusetts |
| 88 | Joseph Gors | 19 | Nephew | Book Binder | Massachusetts |
| 89 | Francis Gors | 18 | Nephew | Candy Maker | Massachusetts |
| 90 | Edmund Gors | 13 | Nephew | — | Massachusetts |
| 91 | John Costello | 34 | Head | Chauffeur | Massachusetts |
| 92 | Mary Costello THIS PERSON | 34 | Wife | — | Maine |
| 93 | Ethel Costello | 2 | Daughter | — | Massachusetts |
| 94 | Patrick Mcclancy | 53 | Head | Cook | Ireland |
| 95 | Catherine Mcclancy | 50 | Wife | — | Ireland |
| 96 | Mary Carney | 7 | Niece | — | Massachusetts |
| 97 | Thomas Burns | 35 | Head | Printer | Massachusetts |
| 98 | Mary Burns | 32 | Wife | — | Massachusetts |
| 99 | Michael Sullivan | 50 | Head | Laborer | Ireland |
| 100 | Ellen Sullivan | 52 | Wife | — | Ireland |
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)