MC
Mary Costello — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, Massachusetts
Our Model Tree links this Mary Costello across the 1920, 1930 and 1940 US Censuses in Essex-County, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1883), then head of a 6-person household.
Age 57
b. ~1883
Female
Spouse
Born: England
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, Massachusetts |
| Surname | Costello |
| Given Name | Mary G |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Lynn |
| 1935 Residence (County) | Essex |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth Country | England |
| Birthplace (normalized) | england |
| Township / Ward | Lynn |
| Est. Birth Year | ~1883 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Kathryn Costello | Daughter | — | 21 | ~1919 |
| Eleanore Costello | Daughter | — | 30 | ~1910 |
| Genevieve Costello | Daughter | — | 24 | ~1916 |
| Jeremiah Costello | Head | — | 64 | ~1876 |
| Charles Costello | Son | — | 15 | ~1925 |
| Mary Costello | Spouse | — | 57 | ~1883 |
Census Appearances
1920
Essex, Massachusetts
Spouse, age 37
Essex, Massachusetts · implied b. ~1883 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Castello |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | England |
| Year of Immigration | 1889 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | England |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | England |
| Year of Naturalization | 1895 |
| Birthplace (normalized) | england |
1930
Essex, Massachusetts
Spouse, age 47
Essex, Massachusetts · implied b. ~1883 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costello |
| Given Name | Mary G |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | England |
| Naturalization Status | Naturalized |
| Year of Immigration | 1889 |
| Age at First Marriage | 26 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | England |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | England |
| Birthplace (normalized) | england |
1940
Essex-County, Massachusetts
Spouse, age 57
Essex-County, Massachusetts · implied b. ~1883 — 6 household members
| Surname | Costello |
| Given Name | Mary G |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Lynn |
| 1935 Residence (County) | Essex |
| Naturalization Status | Naturalized |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth Country | England |
| Birthplace (normalized) | england |
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 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Costello
Spouse · 1940 · age 57 · b. ~1883 · Massachusetts
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Essex-County, Massachusetts
Open full size
1940 US Federal Census — Essex-County, Massachusetts
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-01696-00152)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Isabelle Murphy | 34 | Head | Waitress | Newfoundland |
| 42 | Robert J Murphy | 23 | Son | Painter | Mass |
| 43 | Charles W Murphy | 18 | Son | — | Mass |
| 44 | Henry A Shore | 40 | Head | Milk Man | Vermont |
| 45 | Irene J Shore | 35 | Wife | Storekeeper | New Brunswick |
| 46 | Elaine C Shore | 9 | Daughter | — | New York |
| 47 | Margaret L Shore | 5 | Daughter | — | Vermont |
| 48 | Margaret Carson | 30 | Sister-law | Private Duty | New Brunswick |
| 49 | Cora F Burrage | 60 | Servant | Housekeeper | Mass |
| 50 | Arthur Shore | 60 | Head | Laborer | Vermont |
| 51 | Lottie Shore | 55 | Wife | — | Vermont |
| 52 | Francis C Shore | 18 | Son | Road Builder | Mass |
| 53 | Herald De Leon | 25 | Son-law | Salesman | Mass |
| 54 | Ruth De Leon | 24 | Daughter | — | Mass |
| 55 | Barbara De Leon | 2 | Grandchild | — | Rhode Island |
| 56 | Claire De Leon | 0 | Grandchild | — | Mass |
| 57 | Julia Grummore | 72 | Mother | — | Vermont |
| 58 | Jeremiah Costello | 64 | Head | Book Salesman | Mass |
| 59 | Mary G Costello THIS PERSON | 57 | Wife | — | England |
| 60 | Eleanore Costello | 30 | Daughter | Clerk | Mass |
| 61 | Genevieve Costello | 24 | Daughter | Clerk | Mass |
| 62 | Kathryn Costello | 21 | Daughter | Clerk | Mass |
| 63 | Charles Costello | 15 | Son | — | Mass |
| 64 | William Blodgett | 38 | Head | Machinist | Mass |
| 65 | Bertha Blodgett | 39 | Wife | — | Conn |
| 66 | Ernest Stedman | 19 | Lodger | Machine Operator | Mass |
| 67 | Agnes Bennett | 60 | Head | — | England |
| 68 | Irene White | 40 | Lodger | Sales Girl Rep. | Mass |
| 69 | Anthony Maheras | 32 | Head | Foreman | Mass |
| 70 | Mary Maheras | 28 | Wife | — | Mass |
| 71 | Delores Maheras | 11 | Daughter | — | Mass |
| 72 | Charles Maheras | 7 | Son | — | Mass |
| 73 | Helen Maheras | 4 | Daughter | — | Mass |
| 74 | William Mcnutt | 76 | Head | — | Nova Scotia |
| 75 | Emma Mcnutt | 69 | Wife | — | Nova Scotia |
| 76 | Lotta M Mcnutt | 40 | Daughter | Maid | Nova Scotia |
| 77 | Mary F Stratton | 74 | Head | — | New York |
| 78 | Helen J Stratton | 62 | Sister | — | Conn |
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)