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John Mccormack — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, Massachusetts
Our Model Tree links this John Mccormack across the 1930 and 1940 US Censuses in Essex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1926), then head of a 9-person household.
Age 14
b. ~1926
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, Massachusetts |
| Surname | McCormack |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lawrence |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Highest Grade | S 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Lawrence |
| Est. Birth Year | ~1926 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Raymond Mccormack | Son | — | 8 | ~1932 |
| Theresa Mccormack | Daughter | — | 12 | ~1928 |
| Lillian Mccormack | Spouse | — | 34 | ~1906 |
| James Mccormack | Son | — | 7 | ~1933 |
| Patrick Mccormack | Son | — | 10 | ~1930 |
| John Mccormack | Son | — | 14 | ~1926 |
| Helen Mccormack | Daughter | — | 2 | ~1938 |
| Leo Mccormack | Son | — | 10 | ~1930 |
| Frank Mccormack | Head | — | 36 | ~1904 |
Census Appearances
1930
Essex, Massachusetts
Son, age 4
Essex, Massachusetts · implied b. ~1926 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormick |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | England |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Essex-County, Massachusetts
Son, age 14
Essex-County, Massachusetts · implied b. ~1926 — 9 household members
| Surname | McCormack |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lawrence |
| 1935 Residence (County) | Essex |
| Highest Grade | S 8 |
| 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 14 · b. ~1926 · Massachusetts
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Sibling
Leo Mccormack
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Theresa Mccormack
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patrick Mccormack
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Mccormack
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Mccormack
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Mccormack
Sibling · 1940 · age 8
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 — Essex-County, Massachusetts
Open full size
1940 US Federal Census — Essex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01584-00083)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | James Devlin | 14 | Son | — | Massachusetts |
| 42 | Joseph Michaud | 32 | Head | Butcher | Canada French |
| 43 | Josephine Michaud | 29 | Wife | 0 | Massachusetts |
| 44 | Roger Michaud | 5 | Son | — | Massachusetts |
| 45 | Yvonne Michaud | 4 | Daughter | — | Massachusetts |
| 46 | Lorraine Michaud | 2 | Daughter | — | Massachusetts |
| 47 | Frank Mccormack | 36 | Head | Chauffeur | Maine |
| 48 | Lillian Mccormack | 34 | Wife | Mender | Massachusetts |
| 49 | John Mccormack THIS PERSON | 14 | Son | — | Massachusetts |
| 50 | Theresa Mccormack | 12 | Daughter | — | Massachusetts |
| 51 | Leo Mccormack | 10 | Son | — | Massachusetts |
| 52 | Patrick Mccormack | 10 | Son | — | Massachusetts |
| 53 | Raymond Mccormack | 8 | Son | — | Massachusetts |
| 54 | James Mccormack | 7 | Son | — | Massachusetts |
| 55 | Helen Mccormack | 2 | Daughter | — | Massachusetts |
| 56 | Ernest Hatfield | 31 | Head | Carrier | England |
| 57 | Grace Hatfield | 33 | Wife | 0 | Massachusetts |
| 58 | Sheila Hatfield | 16 | Daughter | New Worker | Massachusetts |
| 59 | Ernest Hatfield | 9 | Son | — | Massachusetts |
| 60 | Richard Hatfield | 6 | Son | — | Massachusetts |
| 61 | Elaine Hatfield | 5 | Daughter | — | Massachusetts |
| 62 | Muriel Hatfield | 3 | Daughter | — | Massachusetts |
| 63 | Nancy Hatfield | 0 | Daughter | — | Massachusetts |
| 64 | Alphonse Mognon | 67 | Head | Doffer | Canada French |
| 65 | Eleonora Mognon | 62 | Wife | 0 | Canada French |
| 66 | Wilfred Mognon | 44 | Son | Watchman | New Hampshire |
| 67 | Leo Bergeron | 37 | Head | Spinner | Massachusetts |
| 68 | Fedora Bergeron | 34 | Wife | Doffer | Massachusetts |
| 69 | Richard Bergeron | 3 | Son | — | Massachusetts |
| 70 | Nellie O'Neil | 62 | Head | 0 | Massachusetts |
| 71 | Cornelius O'Neil | 34 | Son | Bricklayer | Massachusetts |
| 72 | Lucy Cartier | 39 | Head | Winder | Canada French |
| 73 | Clifford Cartier | 20 | Son | Spinner | Massachusetts |
| 74 | Irene Cartier | 19 | Daughter | New Worker | Massachusetts |
| 75 | Edward Cartier | 15 | Son | New Worker | Massachusetts |
| 76 | Michael Guido | 34 | Head | Laborer | Italy |
| 77 | Sophia Guido | 32 | Wife | Sorter | Massachusetts |
| 78 | Elizabeth Guido | 6 | Daughter | — | Massachusetts |
| 79 | Domenico Guido | 5 | Son | — | Massachusetts |
| 80 | George Wallace | 45 | Head | Stock Clerk | Massachusetts |
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)