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John Mccormack — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this John Mccormack across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1918), then head of a 10-person household.
Age 22
b. ~1918
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | McCormack |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Hours Worked | 44 |
| Highest Grade | H-3 |
| 1935 Residence | Same Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City |
| Est. Birth Year | ~1918 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Donald Mccormack | Son | — | 24 | ~1916 |
| Delores Mccormack | Daughter | — | 10 | ~1930 |
| Janet Mccormack | Daughter | — | 11 | ~1929 |
| Joan Mccormack | Daughter | — | 18 | ~1922 |
| Josephine Mccormack | Spouse | — | 46 | ~1894 |
| Judith Mccormack | Daughter | — | 8 | ~1932 |
| Donald Mccormack | Head | — | 47 | ~1893 |
| Gerald Mccormack | Son | — | 14 | ~1926 |
| Ursula Mccormack | Daughter | — | 16 | ~1924 |
| John Mccormack | Son | — | 22 | ~1918 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 12
Suffolk, Massachusetts · implied b. ~1918 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormick |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Son, age 22
Suffolk-County, Massachusetts · implied b. ~1918 — 10 household members
| Surname | McCormack |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Hours Worked | 44 |
| Highest Grade | H-3 |
| 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 John Mccormack across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Mccormack
Son · 1940 · age 22 · b. ~1918 · Massachusetts
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Sibling
Donald Mccormack
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Judith Mccormack
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gerald Mccormack
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joan Mccormack
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ursula Mccormack
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Delores Mccormack
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Janet Mccormack
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-t0627-01659-00217)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Edward Donovan | 34 | Head | Stevedore | Mass |
| 42 | Catherine Donovan | 34 | Wife | — | Mass |
| 43 | Edward Donovan | 5 | Son | — | Mass |
| 44 | George Hopkins | 52 | Head | Operator | Mass |
| 45 | Grace V. Hopkins | 19 | Daughter | — | Massachusetts |
| 46 | Edward Hopkins | 18 | Son | — | Massachusetts |
| 47 | Donald Mccormack | 47 | Head | Helper | Massachusetts |
| 48 | Josephine Mccormack | 46 | Wife | — | Massachusetts |
| 49 | Donald Jr. Mccormack | 24 | Son | New Worker | Massachusetts |
| 50 | John Mccormack THIS PERSON | 22 | Son | — | Massachusetts |
| 51 | Joan Mccormack | 18 | Daughter | — | Massachusetts |
| 52 | Ursula Mccormack | 16 | Daughter | — | Massachusetts |
| 53 | Gerald Mccormack | 14 | Son | — | Massachusetts |
| 54 | Janet Mccormack | 11 | Daughter | — | Massachusetts |
| 55 | Delores Mccormack | 10 | Daughter | — | Massachusetts |
| 56 | Judith Mccormack | 8 | Daughter | — | Massachusetts |
| 57 | Tobias Francini | 56 | Head | Storekeeper | Italy |
| 58 | Olivia Francini | 25 | Daughter | — | Mass |
| 59 | Victor Francini | 21 | Son | Clerk | Mass |
| 60 | Joseph Francini | 21 | Son | Clerk | Mass |
| 61 | Walter Francini | 15 | Son | — | Italy |
| 62 | Frank Francini | 9 | Son | — | Italy |
| 63 | Mary Francini | 52 | Wife | — | Italy |
| 64 | Eli Shmager | 40 | Head | Storekeeper | Russia |
| 65 | Ethel Shmager | 44 | Wife | — | Russia |
| 66 | Ruben Shmager | 18 | Son | — | Mass |
| 67 | David Shmager | 13 | Son | — | Mass |
| 68 | Norma Shmager | 5 | Daughter | — | Mass |
| 69 | John Clinton | 37 | Head | Chauffeur | New York |
| 70 | Mary Clinton | 31 | Wife | — | Mass |
| 71 | Mary L. Clinton | 5 | Daughter | — | Mass |
| 72 | John Clinton | 4 | Son | — | Mass |
| 73 | James A. Driscoll | 55 | Head | Jail Officer | Mass |
| 74 | James A. Jr. Driscoll | 26 | Son | Clerk | Massachusetts |
| 75 | Cornelius J. Driscoll | 23 | Son | Clerk | Massachusetts |
| 76 | Arthur C. Driscoll | 21 | Son | New Worker | Massachusetts |
| 77 | Jane M. O'Neill | 31 | Head | Chauffeur | Massachusetts |
| 78 | Ruth E. O'Neill | 34 | Wife | — | Massachusetts |
| 79 | Ruth M. O'Neill | 12 | Daughter | — | Massachusetts |
| 80 | James J. Jr. O'Neill | 11 | Son | — | Massachusetts |
Related Census Records
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)