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John Brennan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this John Brennan across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1900), then head of a 10-person household.
Age 40
b. ~1900
Male
Head
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Brennan |
| Given Name | John A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Laborer |
| Industry | Public Welfare |
| Class of Worker | GW |
| Hours Worked | 38 |
| Income (1939) | 750 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Laborer |
| Township / Ward | Boston City |
| Est. Birth Year | ~1900 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Maureen Brennan | Daughter | — | ~1940 | |
| Margaret Brennan | Daughter | — | 13 | ~1927 |
| Catherine Brennan | Daughter | — | 5 | ~1935 |
| John Brennan | Head | — | 40 | ~1900 |
| William Brennan | Son | — | 10 | ~1930 |
| Thomas Brennan | Son | — | 11 | ~1929 |
| Edward Brennan | Son | — | 7 | ~1933 |
| John Brennan | Son | — | 14 | ~1926 |
| Richard Brennan | Son | — | 2 | ~1938 |
| Margaret Brennan | Spouse | — | 37 | ~1903 |
Census Appearances
1930
Suffolk, Massachusetts
Other, age 29
Suffolk, Massachusetts · implied b. ~1901 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | John A |
| Relationship to Head | roomer |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Age at First Marriage | 27 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Canada |
| Occupation | laborer |
| Industry | century |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Head, age 40
Suffolk-County, Massachusetts · implied b. ~1900 — 10 household members
| Surname | Brennan |
| Given Name | John A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Occupation | Laborer |
| Industry | Public Welfare |
| Class of Worker | GW |
| Hours Worked | 38 |
| Income (1939) | 750 |
| Highest Grade | No 8 |
| 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 John Brennan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Brennan
Head · 1940 · age 40 · b. ~1900 · Massachusetts
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
36 people indexed on this census page (nara:1940:m-t0627-01680-00899)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Teresa M. Holbrook | 64 | Head | — | Hungary |
| 42 | Rudolph J. Savore | 41 | Son | Truck Driver | Massachusetts |
| 43 | Emma Savore | 35 | Daughter | Receiving | Massachusetts |
| 44 | Marguerite T. Savore | 10 | Grand-daughter | — | Massachusetts |
| 45 | Michael J. Gervais | 39 | Head | Laborer | New Jersey |
| 46 | Beatrice J. Gervais | 25 | Wife | — | Massachusetts |
| 47 | Michael J. Jr. Gervais | 5 | Son | — | Massachusetts |
| 48 | Margaret R. Baker | 62 | Head | — | Eire |
| 49 | John R. Baker | 25 | Son | Punch Press Operator | Massachusetts |
| 50 | John A. Brennan THIS PERSON | 40 | Head | Laborer | Massachusetts |
| 51 | Margaret A. Brennan | 37 | Wife | — | Massachusetts |
| 52 | John R. Jr. Brennan | 14 | Son | Newsboy | Massachusetts |
| 53 | Margaret L. Brennan | 13 | Daughter | — | Massachusetts |
| 54 | Thomas D. Brennan | 11 | Son | — | Massachusetts |
| 55 | William H. Brennan | 10 | Son | — | Massachusetts |
| 56 | Edward P. Brennan | 7 | Son | — | Massachusetts |
| 57 | Catherine M. Brennan | 5 | Daughter | — | Massachusetts |
| 58 | Richard L. Brennan | 2 | Son | — | Massachusetts |
| 59 | Maureen A. Brennan | 0 | Daughter | — | Massachusetts |
| 61 | David E. Chenell | 65 | Head | — | Canada-French |
| 62 | Emily J. Chenell | 51 | Wife | — | Canada-English |
| 63 | Harold B. Chenell | 29 | Son | — | Massachusetts |
| 64 | James C. Chenell | 27 | Son | Carpenter | Canada-English |
| 65 | George R. Chenell | 24 | Son | Cost Accountant | Canada-English |
| 66 | Herbert L. Chenell | 22 | Son | Carpenter | Massachusetts |
| 67 | Eleanor J. K. Chenell | 15 | Daughter | — | Massachusetts |
| 68 | Arthur H. Collins | 30 | Head | Truck Driver | Massachusetts |
| 69 | Mildred L. Collins | 29 | Wife | Table Waitress | Massachusetts |
| 70 | Salvatore Provost | 24 | Head | Furniture Polisher | Massachusetts |
| 71 | Marguerite K. Provost | 25 | Wife | — | Connecticut |
| 72 | Peter J. Provost | 4 | Son | — | Massachusetts |
| 73 | Marguerite D. Provost | 1 | Daughter | — | Massachusetts |
| 77 | John Neill | 51 | Head | Baker | No. Ireland |
| 78 | Catherine Neill | 49 | Wife | — | No. Ireland |
| 79 | Robert J. Neill | 18 | Son | Dishwasher | Massachusetts |
| 80 | Kathleen Neill | 18 | Daughter | Drill Housework | Massachusetts |
Related Census Records
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)