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Mary Lennon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, New Jersey
Our Model Tree links this Mary Lennon across the 1930 and 1940 US Censuses in Essex-County, New Jersey (XGBoost, ~Confirmed) — first a daughter (b.~1926), then head of a 7-person household.
Age 14
b. ~1926
Female
Daughter
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, New Jersey |
| Surname | Lennon |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Montclair Town |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Montclair Town |
| 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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Lennon | Daughter | — | 14 | ~1926 |
| Theresa Lennon | Daughter | — | 16 | ~1924 |
| John Lennon | Head | — | 39 | ~1901 |
| John Lennon | Son | — | 2 | ~1938 |
| Mrs Lennon | Spouse | — | 35 | ~1905 |
| Elizabeth Lennon | Daughter | — | 9 | ~1931 |
| William Lennon | Other | — | 51 | ~1889 |
Census Appearances
1930
Essex, New …
Daughter, age 5
Essex, New Jersey · implied b. ~1925 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lemon |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Essex-County, New …
Daughter, age 14
Essex-County, New Jersey · implied b. ~1926 — 7 household members
| Surname | Lennon |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Montclair Town |
| 1935 Residence (County) | Essex |
| Class of Worker | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 Lennon across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Lennon
Daughter · 1940 · age 14 · b. ~1926 · New Jersey
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Sibling
Elizabeth Lennon
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Lennon
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Theresa Lennon
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, New Jersey
Open full size
1940 US Federal Census — Essex-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02337-00743)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William H Berry | 81 | Head | — | Virginia |
| 2 | Mrs. Mary E Berry | 68 | Wife | — | Virginia |
| 3 | Nicholas Cardell | 45 | Head | Auto Salesman | Italy |
| 4 | Mrs. Grace Cardell | 43 | Wife | Spooler | New Jersey |
| 5 | Grace Cardell | 17 | Daughter | — | New Jersey |
| 6 | Dominick Castraglio | 50 | Brother-in-law | Gardner | Italy |
| 7 | Joseph Cardellicchio | 72 | Head | — | Italy |
| 8 | Mrs. Carmela Cardellicchio | 72 | Wife | — | Italy |
| 9 | John Lennon | 39 | Head | Milkman | New Jersey |
| 10 | Mrs. Dorothy Lennon | 35 | Wife | — | New Jersey |
| 11 | Theresa Lennon | 16 | Daughter | — | New Jersey |
| 12 | Mary Lennon THIS PERSON | 14 | Daughter | — | New Jersey |
| 13 | Elizabeth Lennon | 9 | Daughter | — | New Jersey |
| 14 | John Jr. Lennon | 2 | Son | — | New Jersey |
| 15 | William Lennon | 51 | Uncle | Die Cutter | New Jersey |
| 16 | Patsy Gallo | 44 | Head | Plumber | Italy |
| 17 | Mrs. Palmira Gallo | 38 | Wife | — | New Jersey |
| 18 | Michael Gallo | 11 | Son | — | New Jersey |
| 19 | Theresa Gallo | 10 | Daughter | — | New Jersey |
| 20 | Flora Gallo | 9 | Daughter | — | New Jersey |
| 21 | Theresa Gallo | 82 | Mother | — | Italy |
| 22 | Alice Burrough | 50 | Head | Domestic Worker | Virginia? |
| 23 | Edeline Reed | 62 | Head | — | No. Carolina? |
| 24 | Reed | 20 | Grandson | Truck Driver | No. Carolina? |
| 25 | Ethel Hamilton | 50 | Head | Domestic Worker | No. Carolina? |
| 26 | Aubrey Green | 31 | Head | — | Virginia |
| 27 | Mrs. Cora Green | 32 | Wife | — | Virginia |
| 28 | Mabel Green | 12 | Daughter | — | Virginia |
| 29 | Mary Green | 10 | Daughter | — | New Jersey |
| 30 | Johnnie Alexander | 41 | Head | Maid | No. Carolina |
| 31 | Beatrice Weeks | 55 | Head | Domestic Work | Asbury Park |
| 32 | Mrs. Kay Butler | 54 | Head | Laundress | No. Carolina |
| 33 | Raymond Holland | 22 | Son-in-law | Laborer | Virginia |
| 34 | Mrs. Hattie Holland | 21 | Daughter | — | No. Carolina |
| 35 | Katie Holland | 0 | Grand-daughter | 0 | New Jersey |
| 36 | Eldridge Layer | 39 | Head | Laborer | Maryland |
| 37 | Ara Layer | 36 | Wife | — | Maryland |
| 38 | June Layer | 14 | Daughter | — | New Jersey |
| 39 | Vernon Layer | 12 | Son | — | New Jersey |
| 40 | Calvin Layer | 11 | Son | — | New Jersey |
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)