MK
Mary Keenan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Keenan across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1920), then head of a 6-person household.
Age 20
b. ~1920
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Keenan |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Salesgirl |
| Industry | Retail grocery |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 298 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Salesgirl |
| Township / Ward | Medford City |
| Est. Birth Year | ~1920 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Joseph Keenan | Son | — | 16 | ~1924 |
| Patrick Keenan | Head | — | 60 | ~1880 |
| Catherine Keenan | Spouse | — | 48 | ~1892 |
| Patrick Keenan | Son | — | 19 | ~1921 |
| Francis Keenan | Son | — | 14 | ~1926 |
| Mary Keenan | Daughter | — | 20 | ~1920 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 10
Middlesex, Massachusetts · implied b. ~1920 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Keenon |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Northern Ireland |
| Mother's Birthplace | Northern Ireland |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 20
Middlesex-County, Massachusetts · implied b. ~1920 — 6 household members
| Surname | Keenan |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Occupation | Salesgirl |
| Industry | Retail grocery |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 298 |
| Highest Grade | Hs 4 |
| 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 Keenan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Keenan
Daughter · 1940 · age 20 · b. ~1920 · Massachusetts
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Sibling
Patrick Keenan
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Keenan
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Keenan
Sibling · 1940 · age 14
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
40 people indexed on this census page (nara:1940:m-t0627-01611-00187)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Samuel Buchanan | 47 | Head | Milkman | Scotland |
| 2 | Caroline M. Buchanan | 44 | Wife | — | Massachusetts |
| 3 | Catherine H. Buchanan | 21 | Daughter | — | Massachusetts |
| 4 | Paul V. Buchanan | 20 | Son | New Worker | Massachusetts |
| 5 | Marjory E. Buchanan | 18 | Daughter | New Worker | Massachusetts |
| 6 | Robert W. Buchanan | 15 | Son | Sewing | Massachusetts |
| 7 | Jean M. Buchanan | 12 | Daughter | — | Massachusetts |
| 8 | Mary Caroline Buchanan | 6 | Daughter | — | Massachusetts |
| 9 | Patrick Keenan | 60 | Head | Laborer | Eire |
| 10 | Catherine A. Keenan | 48 | Wife | — | Eire |
| 11 | Mary E. Keenan THIS PERSON | 20 | Daughter | Salesgirl | Massachusetts |
| 12 | Patrick J. Keenan | 19 | Son | New Worker | Massachusetts |
| 13 | Joseph J. Keenan | 16 | Son | — | Massachusetts |
| 14 | Francis O. Keenan | 14 | Son | — | Massachusetts |
| 15 | George H. Harmon | 56 | Head | Checker | Massachusetts |
| 16 | Isabelle C. Harmon | 55 | Wife | — | Massachusetts |
| 17 | Robert Harmon | 23 | Son | Assistant | Massachusetts |
| 18 | Alice J. Harmon | 21 | Daughter | Paster | Massachusetts |
| 19 | Frances Harmon | 19 | Daughter | Clerical | Massachusetts |
| 20 | Donald Harmon | 18 | Son | — | Massachusetts |
| 21 | Kenneth Harmon | 15 | Son | — | Massachusetts |
| 22 | Roy Harmon | 13 | Son | — | Massachusetts |
| 23 | Marinus Van Breemen | 38 | Head | Electrician | Holland |
| 24 | Catherine Van Breemen | 35 | Wife | Salesgirl | Massachusetts |
| 25 | Paul J. Van Breemen | 17 | Son | — | Massachusetts |
| 26 | Dolores L. Van Breemen | 11 | Daughter | — | Massachusetts |
| 27 | Richard O. Daley | 71 | Head | — | England |
| 28 | Juliette Daley | 70 | Wife | — | Massachusetts |
| 29 | Vivian Walker | 45 | Daughter | — | Massachusetts |
| 30 | Mary S. Pratt | 73 | Head | — | Massachusetts |
| 31 | Warren S. Pratt | 45 | Son | Accountant | Massachusetts |
| 32 | Edmund L. Bonchi | 39 | Head | Superintendent | Massachusetts |
| 33 | Flora A. Bonchi | 42 | Wife | — | Massachusetts |
| 34 | Edmund L. Bonchi | 10 | Son | — | Massachusetts |
| 35 | George E. Bonchi | 10 | Son | — | Massachusetts |
| 36 | Robert D. Bonchi | 6 | Son | — | Massachusetts |
| 37 | George C. Brymer | 70 | Head | Syrup Mixer | Canada English |
| 38 | Mary A. Brymer | 75 | Wife | — | Canada English |
| 39 | Michael J. Maher | 73 | Head | — | Eire |
| 40 | Hannah Maher | 69 | Wife | — | Eire |
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)