JK
John Keefe — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Keefe across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1918), then head of a 5-person household.
Age 22
b. ~1918
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Keefe |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Mail Clerk |
| Class of Worker | PW |
| Hours Worked | 20 |
| Income (1939) | 0 |
| Highest Grade | H 3 |
| 1935 Residence | Same House |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Mail Clerk |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1918 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Keefe | Son | — | 22 | ~1918 |
| Joseph Keefe | Head | — | 59 | ~1881 |
| Mary Keefe | Spouse | — | 57 | ~1883 |
| Mary Keefe | Daughter | — | 18 | ~1922 |
| Walter Keefe | Son | — | 25 | ~1915 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 11
Suffolk, Massachusetts · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Keefe |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 22
Middlesex-County, Massachusetts · implied b. ~1918 — 5 household members
| Surname | Keefe |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Occupation | Mail Clerk |
| Class of Worker | PW |
| Hours Worked | 20 |
| Income (1939) | 0 |
| Highest Grade | H 3 |
| 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 Keefe across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Keefe
Son · 1940 · age 22 · b. ~1918 · Massachusetts
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Sibling
Mary Keefe
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Keefe
Sibling · 1940 · age 25
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-t0627-01702-00657)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Maurice Shaughnessy | 15 | Son | — | Massachusetts |
| 42 | Theresa Shaughnessy | 13 | Daughter | — | Massachusetts |
| 43 | Arline Shaughnessy | 7 | Daughter | — | Massachusetts |
| 44 | Manuel Goula | 36 | Head | Furniture | Portugal |
| 45 | Alice Goula | 31 | Wife | — | Massachusetts |
| 46 | Alice Goula | 10 | Daughter | — | Massachusetts |
| 47 | Thomas Goula | 4 | Son | — | Massachusetts |
| 48 | Francis Laguier | 41 | Head | Laborer | Canada English |
| 49 | Mary Laguier | 43 | Wife | — | Canada English |
| 50 | Francis Laguier | 12 | Son | — | Massachusetts |
| 51 | Mary Laguier | 10 | Daughter | — | Massachusetts |
| 52 | John Laguier | 10 | Son | — | Massachusetts |
| 53 | William Laguier | 5 | Son | — | Massachusetts |
| 54 | Elizabeth Murphy | 38 | Sister-in-law | — | Massachusetts |
| 55 | David Beasley | 52 | Head | Truck Driver | Russia |
| 56 | Jenny Beasley | 51 | Wife | — | Russia |
| 57 | Daniel J. Shea | 34 | Head | Truck Driver | Massachusetts |
| 58 | Marie Shea | 29 | Wife | — | Portugal |
| 59 | William Shea | 7 | Son | — | Massachusetts |
| 60 | Carolyn Shea | 2 | Daughter | — | Massachusetts |
| 61 | Louise Shea | 1 | Daughter | — | Massachusetts |
| 62 | Joseph Keefe | 59 | Head | Steamfitter | Massachusetts |
| 63 | Mary Keefe | 57 | Wife | — | Massachusetts |
| 64 | Walter Keefe | 25 | Son | Newswriter | Massachusetts |
| 65 | John Keefe THIS PERSON | 22 | Son | Mail Clerk | Massachusetts |
| 66 | Mary E. Keefe | 18 | Daughter | Nurses Aide | Massachusetts |
| 67 | Ira Britton | 62 | Head | — | Russia |
| 68 | Sarah Britton | 56 | Wife | — | Russia |
| 69 | Leo Fafel | 27 | Son-in-law | Salesman | Massachusetts |
| 70 | Edna Fafel | 24 | Daughter | — | Massachusetts |
| 71 | William Shea | 80 | Head | — | Canada English |
| 72 | George Shea | 47 | Brother | Packer | Massachusetts |
| 73 | Alfred Shea | 45 | Brother | Salesman | Massachusetts |
| 74 | Lena Shea | 42 | Sister | Typist | Massachusetts |
| 75 | Sadie Mcclellan | 30 | Housekeeper | Housekeeper | Massachusetts |
| 76 | Grace Kenney | 60 | Head | — | Eire |
| 77 | Alice Kenney | 30 | Daughter | — | Eire |
| 78 | John T. Kenney | 53 | Head | Laborer | Canada English |
| 79 | Josephine Kenney | 51 | Wife | — | Canada English |
| 80 | John Kenney | 25 | Son | Counterman | 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)