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John Mcnamara — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Mcnamara across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Delia & James — first a son (b.~1918), then head of a 4-person household.
Age 22
b. ~1918
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | McNamara |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Cambridge City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Messenger |
| Industry | News paper |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 224 |
| Highest Grade | H 4 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Messenger |
| Township / Ward | Cambridge 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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| James Mcnamara | Head | — | 56 | ~1884 |
| James Mcnamara | Son | — | 23 | ~1917 |
| John Mcnamara | Son | — | 22 | ~1918 |
| Delia Mcnamara | Spouse | — | 60 | ~1880 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 1
Middlesex, Massachusetts · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McNamara |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 11
Middlesex, Massachusetts · implied b. ~1919 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McNamara |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| 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 — 4 household members
| Surname | McNamara |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Cambridge City |
| 1935 Residence (County) | Middlesex |
| Occupation | Messenger |
| Industry | News paper |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 224 |
| Highest Grade | H 4 |
| 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 Mcnamara across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Delia Mcnamara (~0.92 confidence) and father James Mcnamara (~0.92 confidence) and father John Mcnamara (~0.92 confidence) and mother Margaret Mcnamara (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Delia Mcnamara
b. ~1880
Source mother
● Household
· direct · ~0.92
Father
James Mcnamara
b. ~1884
Source father
● Household
· direct · ~0.92
Father
John Mcnamara
b. ~1894
Source father
● Household
· direct · ~0.92
Mother
Margaret Mcnamara
b. ~1896
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mcnamara
Son · 1940 · age 22 · b. ~1918 · Massachusetts
★ You are viewing this record
Sibling
James Mcnamara
Sibling · 1940 · age 23
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-t0627-01684-00033)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Catherine T. Callahan | 68 | Head | — | Eire |
| 2 | Mary A. Callahan | 40 | daughter | Secretary | Massachusetts |
| 3 | Catherine P. Callahan | 39 | daughter | Clerk Office | Massachusetts |
| 4 | Daniel V. Callahan | 37 | son | Janitor | Massachusetts |
| 5 | Margaret Callahan | 33 | daughter | — | Massachusetts |
| 6 | Joseph A. Callahan | 31 | son | Salesman - Beer | Massachusetts |
| 7 | Patrick J. Nolan | 57 | Head | Cook | Newfoundland |
| 8 | Amelia Nolan | 54 | Wife | — | Newfoundland |
| 9 | Andrew Nolan | 22 | son | New Worker | Massachusetts |
| 10 | Joseph Nolan | 19 | son | Delivery Boy | Massachusetts |
| 11 | Francis Nolan | 16 | son | New Worker | Massachusetts |
| 12 | Edmund Nolan | 12 | son | — | Massachusetts |
| 13 | Edward Whalen | 30 | step-son | — | Massachusetts |
| 14 | Josephine Whalen | 29 | step-daughter | Wrapper | Massachusetts |
| 15 | William F. Higgins | 47 | Head | Laborer | Massachusetts |
| 16 | Mary A. Higgins | 51 | wife | — | Massachusetts |
| 17 | Edmund Higgins | 23 | son | — | Massachusetts |
| 18 | Richard Higgins | 17 | son | — | Massachusetts |
| 19 | William Higgins | 14 | son | — | Massachusetts |
| 20 | Antonio Cappucci | 34 | Head | Bed Laster | Italy |
| 21 | Angelina Cappucci | 28 | Wife | Packer | Massachusetts |
| 22 | Marie Cappucci | 5 | daughter | — | Massachusetts |
| 23 | Hattie Crowley | 56 | Head | Cook | Massachusetts |
| 24 | William Crowley | 25 | son | Laboratory Assistant | Massachusetts |
| 25 | Catherine Leary | 70 | Head | — | Massachusetts |
| 26 | Edward Hastings | 45 | nephew | — | Massachusetts |
| 27 | James J. Mcnamara | 56 | Head | — | Eire |
| 28 | Delia Mcnamara | 60 | Wife | — | Eire |
| 29 | James Mcnamara | 23 | son | Laborer | Massachusetts |
| 30 | John Mcnamara THIS PERSON | 22 | son | Messenger | Massachusetts |
| 31 | Bernard Gray | 29 | Head | Ship Fitter Helper | Massachusetts |
| 32 | Mary Gray | 25 | wife | — | Massachusetts |
| 33 | Bernard Jr. Gray | 2 | son | — | Massachusetts |
| 34 | Marilyn Gray | 0 | daughter | — | Massachusetts |
| 35 | Joseph Kasco | 50 | Head | Butcher | Italy |
| 36 | Josephine Kasco | 40 | Wife | — | Italy |
| 37 | Salvatore Kasco | 17 | son | New Worker | Massachusetts |
| 38 | Alice Kasco | 14 | daughter | — | Massachusetts |
| 39 | Dorothy Kasco | 20 | daughter | — | Italy |
Pedigree Summary
John + 1 sibling
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)