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John Jennings — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, Massachusetts
Our Model Tree links this John Jennings across the 1930 and 1940 US Censuses in Essex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 9-person household.
Age 15
b. ~1925
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, Massachusetts |
| Surname | Jennings |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Salem City |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Industry | S |
| Highest Grade | H 1 |
| 1935 Residence | Same House |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Salem City |
| Est. Birth Year | ~1925 |
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 |
|---|---|---|---|---|
| Patricia Jennings | Daughter | — | 1 | ~1939 |
| Margaret Jennings | Daughter | — | 1 | ~1939 |
| Eileen Jennings | Daughter | — | 16 | ~1924 |
| Josephine Jennings | Daughter | — | 2 | ~1938 |
| Nancy Jennings | Daughter | — | 7 | ~1933 |
| Patrick Jennings | Head | — | 42 | ~1898 |
| John Jennings | Son | — | 15 | ~1925 |
| William Jennings | Son | — | 10 | ~1930 |
| Margaret Jennings | Spouse | — | 41 | ~1899 |
Census Appearances
1930
Essex, Massachusetts
Son, age 4
Essex, Massachusetts · implied b. ~1926 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jennings |
| Given Name | John J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Essex-County, Massachusetts
Son, age 15
Essex-County, Massachusetts · implied b. ~1925 — 9 household members
| Surname | Jennings |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Salem City |
| 1935 Residence (County) | Essex |
| Industry | S |
| Highest Grade | H 1 |
| 1935 Residence | Same House |
| 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 Jennings across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Jennings
Son · 1940 · age 15 · b. ~1925 · Massachusetts
★ You are viewing this record
Sibling
Margaret Jennings
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Jennings
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nancy Jennings
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Josephine Jennings
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Jennings
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eileen Jennings
Sibling · 1940 · age 16
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-t0627-01589-01030)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Charles Leiko | 46 | Head | Machinist | Poland |
| 2 | Marcella Leiko | 42 | Wife | — | Poland |
| 3 | Adolph Leiko | 26 | Son | Shoe Worker | Massachusetts |
| 4 | Marion Leiko | 19 | Daughter | — | Massachusetts |
| 5 | Patrick Jennings | 42 | Head | Leather Worker | Irish Free State |
| 6 | Margaret Jennings | 41 | Wife | — | Irish Free State |
| 7 | Eileen Jennings | 16 | Daughter | — | Massachusetts |
| 8 | John Jennings THIS PERSON | 15 | Son | — | Massachusetts |
| 9 | William Jennings | 10 | Son | — | Massachusetts |
| 10 | Nancy Jennings | 7 | Daughter | — | Massachusetts |
| 11 | Josephine Jennings | 2 | Daughter | — | Massachusetts |
| 12 | Margaret A. Jennings | 1 | Daughter | — | Massachusetts |
| 13 | Patricia A. Jennings | 1 | Daughter | — | Massachusetts |
| 14 | Isidor Golper | 56 | Head | Real Estate | Russia |
| 15 | Blanche Golper | 54 | Wife | — | Russia |
| 16 | Jacob Golper | 32 | Son | Clothier | Russia |
| 17 | G. Sidney Golper | 30 | Son | Teacher | Russia |
| 18 | Arthur J. Mccrean | 33 | Head | Leather Worker | Massachusetts |
| 19 | Florence Mccrean | 35 | Wife | — | Massachusetts |
| 20 | Marcia A. Mccrean | 4 | Daughter | — | Massachusetts |
| 21 | Kevin A. Mccrean | 1 | Son | — | Massachusetts |
| 22 | Cornelius J. Mccrean | 70 | Head | — | Massachusetts |
| 23 | Mary A. Mccrean | 60 | Wife | — | Massachusetts |
| 24 | Walter H. Smith | 68 | Head | — | Massachusetts |
| 25 | William F. Leahy | 46 | Head | Cemetery Worker | Massachusetts |
| 26 | Josephine Leahy | 40 | Wife | — | Canada-French |
| 27 | Richard A. Leahy | 13 | Son | — | Massachusetts |
| 28 | Dorothy M. Leahy | 2 | Daughter | — | Massachusetts |
| 29 | Elbert Calef | 72 | Head | — | Massachusetts |
| 30 | Josephine F. Calef | 71 | Wife | — | Massachusetts |
| 31 | Elbert Calef | 21 | Son | — | Massachusetts |
| 32 | Marie Calef | 18 | Daughter | — | Massachusetts |
| 33 | Virginia Calef | 14 | Daughter | — | Massachusetts |
| 34 | Patricia Calef | 9 | Daughter | — | Massachusetts |
| 35 | Catherine Lonergan | 75 | Mother-in-law | — | Irish Free State |
| 36 | Catherine Litka | 69 | Head | — | Poland |
| 37 | Arthur Litka | 28 | Son | New Worker | Massachusetts |
| 38 | Dan Atherton | 33 | Lodger | Supervisor | Illinois |
| 39 | Albie Corthell | 45 | Head | Leather Worker | Massachusetts |
| 40 | Thomas Hill | 55 | Head | Farmer | Irish Free State |
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)