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Mary Mckenna — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Mckenna across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1927), then head of a 11-person household.
Age 13
b. ~1927
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | McKenna |
| Given Name | Mary T. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lowell |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | H-1 |
| 1935 Residence | Same Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Lowell |
| Est. Birth Year | ~1927 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Rita Mckenna | Daughter | — | 9 | ~1931 |
| Marguerite Mckenna | Daughter | — | 7 | ~1933 |
| Mary Mckenna | Daughter | — | 13 | ~1927 |
| Jean Mckenna | Daughter | — | 4 | ~1936 |
| Helen Mckenna | Daughter | — | 8 | ~1932 |
| Thomas Mckenna | Head | — | 38 | ~1902 |
| Kenneth Mckenna | Son | — | 2 | ~1938 |
| Hugh Mckenna | Son | — | 3 | ~1937 |
| David Mckenna | Son | — | 5 | ~1935 |
| Thomas Mckenna | Son | — | 11 | ~1929 |
| Gertrude Mckenna | Spouse | — | 35 | ~1905 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 2
Middlesex, Massachusetts · implied b. ~1928 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McKenna |
| Given Name | Mary T. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 13
Middlesex-County, Massachusetts · implied b. ~1927 — 11 household members
| Surname | McKenna |
| Given Name | Mary T. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lowell |
| 1935 Residence (County) | Middlesex |
| Highest Grade | H-1 |
| 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 Mary Mckenna across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mckenna
Daughter · 1940 · age 13 · b. ~1927 · Massachusetts
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Sibling
Kenneth Mckenna
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Mckenna
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rita Mckenna
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Mckenna
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Mckenna
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jean Mckenna
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marguerite Mckenna
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hugh Mckenna
Sibling · 1940 · age 3
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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01694-00549)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert A. Cote | 22 | Head | H | Massachusetts |
| 2 | Patricia Cote | 0 | Daughter | — | Massachusetts |
| 3 | Leo Cote | 19 | Son | — | Massachusetts |
| 4 | William Cote | 4 | Son | — | Massachusetts |
| 5 | Thomas F. Mckenna | 38 | Head | Clerk | Massachusetts |
| 6 | Gertrude Mckenna | 35 | Wife | H | Massachusetts |
| 7 | Mary T. Mckenna THIS PERSON | 13 | Daughter | — | Massachusetts |
| 8 | Thomas Jr. Mckenna | 11 | Son | — | Massachusetts |
| 9 | Rita Mckenna | 9 | Daughter | — | Massachusetts |
| 10 | Helen Mckenna | 8 | Daughter | — | Massachusetts |
| 11 | Marguerite Mckenna | 7 | Daughter | — | Massachusetts |
| 12 | David Mckenna | 5 | Son | — | Massachusetts |
| 13 | Jean Mckenna | 4 | Daughter | — | Massachusetts |
| 14 | Hugh Mckenna | 3 | Son | — | Massachusetts |
| 15 | Kenneth Mckenna | 2 | Son | — | Massachusetts |
| 17 | James F. Bell | 65 | Head | Janitor | Massachusetts |
| 18 | Eva Bell | 60 | Wife | Sewer | Massachusetts |
| 19 | James Bell | 19 | Son | Quiller | Massachusetts |
| 20 | Robert Bell | 14 | Son | S | Massachusetts |
| 21 | George Ainsworth | 34 | Head | Paper Finisher | Massachusetts |
| 22 | Catherine Ainsworth | 36 | Wife | Spinner | Massachusetts |
| 23 | George Jr. Ainsworth | 13 | Son | — | Massachusetts |
| 24 | Joseph Ainsworth | 9 | Son | — | Massachusetts |
| 25 | Patricia Ainsworth | 8 | Daughter | — | Massachusetts |
| 26 | James Ainsworth | 5 | Son | — | Massachusetts |
| 27 | Mary Quirk | 50 | Head | Cloth Inspector | Ireland |
| 28 | Albert H. Miller | 47 | Head | Laborer | Massachusetts |
| 29 | Leland G. Miller | 48 | Wife | H | Massachusetts |
| 30 | Marguerite Miller | 22 | Daughter | Dress Maker | Massachusetts |
| 31 | James Miller | 23 | Son | — | Massachusetts |
| 32 | John Morris | 28 | Head | Age Operator | Massachusetts |
| 33 | Anna Morris | 25 | Wife | H | Massachusetts |
| 34 | Mary B. Morris | 1 | Daughter | — | Massachusetts |
| 35 | Roland Donato | 26 | Head | Salesman | New Hampshire |
| 36 | Frances Donato | 26 | Wife | Doffer | Massachusetts |
| 37 | James B. Davis | 35 | Head | Attendant | Massachusetts |
| 38 | Alice Davis | 32 | Wife | H | Massachusetts |
| 39 | Alice A. Sullivan | 37 | Head | Field Worker | Massachusetts |
| 40 | Edward Sullivan | 17 | Son | S | 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)