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Mary Brennan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this Mary Brennan across the 1920, 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed) — first a spouse (b.~1863), then head of a 6-person household.
Age 77
b. ~1863
Female
Spouse
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Brennan |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 77 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Industry | 0 |
| Class of Worker | 0 |
| Highest Grade | H 8 |
| 1935 Residence | Same house |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1863 |
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 |
|---|---|---|---|---|
| Catherine Williams | Daughter | — | 27 | ~1913 |
| Mary Williams | Daughter | — | 54 | ~1886 |
| William Brennan | Head | — | 78 | ~1862 |
| William Williams | Other | — | 57 | ~1883 |
| William Williams | Son | — | 24 | ~1916 |
| Mary Brennan | Spouse | — | 77 | ~1863 |
Census Appearances
1920
Baltimore, Maryland
Spouse, age 56
Baltimore, Maryland · implied b. ~1864 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brannan |
| Given Name | Mary A |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
None, Maryland
Other, age 66
None, Maryland · implied b. ~1864 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brannan |
| Given Name | Mary R |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 66 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 20 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Spouse, age 77
Baltimore-City-County, Maryland · implied b. ~1863 — 6 household members
| Surname | Brennan |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 77 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Industry | 0 |
| Class of Worker | 0 |
| Highest Grade | H 8 |
| 1935 Residence | Same house |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
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 Brennan across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Brennan
Spouse · 1940 · age 77 · b. ~1863 · Maryland
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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 — Baltimore-City-County, Maryland
Open full size
1940 US Federal Census — Baltimore-City-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01539-00825)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Richard Lally | 5 | Son | — | Maryland |
| 2 | Anne Lally | 5 | Daughter | — | Maryland |
| 3 | Edward Eder | 71 | Head | Stationary Engineer | Germany |
| 4 | Mary S Eder | 67 | Wife | — | Maryland |
| 5 | Julia Eder | 27 | Daughter | Operator | Maryland |
| 6 | Edward S Eder | 24 | Son | Clerk-Operator | Maryland |
| 7 | Clarence Hessy | 61 | Head | Credit Mgr | Maryland |
| 8 | Ella S Hessy | 49 | Wife | Teacher | Maryland |
| 9 | John Hessy | 17 | Son | — | Maryland |
| 10 | Benj Palmer | 30 | Head | Bond Salesman | Maryland |
| 11 | Mary O Palmer | 28 | Wife | — | Maryland |
| 12 | Robert Palmer | 6 | Son | — | Maryland |
| 13 | John Clausen | 38 | Head | Salesman | Minnesota |
| 14 | Mildred Clausen | 36 | Wife | — | Minnesota |
| 15 | Jonathan Clausen | 14 | Son | — | Minnesota |
| 16 | Jay Clausen | 11 | Son | — | Maryland |
| 17 | Janet Clausen | 9 | Daughter | — | Maryland |
| 18 | Joseph Formey | 41 | Head | Architect | Maryland |
| 19 | Josephine Formey | 38 | Wife | — | Maryland |
| 20 | John Formey | 5 | Son | — | Maryland |
| 21 | Joseph Jr Formey | 2 | Son | — | Maryland |
| 22 | William Brennan | 78 | Head | — | Maryland |
| 23 | Mary Brennan THIS PERSON | 77 | Wife | — | Maryland |
| 24 | William Williams | 57 | Son-in-law | Deputy | Maryland |
| 25 | Mary B Williams | 54 | Daughter | — | Maryland |
| 26 | Catherine Williams | 27 | Daughter | — | Maryland |
| 27 | William Jr Williams | 24 | Son | Clerk | Maryland |
| 28 | Donald Schaut | 29 | Head | Statistician | Maryland |
| 29 | Ellen O Schaut | 28 | Wife | — | Illinois |
| 30 | Richard Schaut | 2 | Son | — | Maryland |
| 31 | Catherine Reilly | 59 | Head | — | Maryland |
| 32 | Catherine Reilly | 25 | Daughter | Dress Maker | Maryland |
| 33 | Francis Reilly | 18 | Son | — | Maryland |
| 34 | Nellie Wyman | 70 | Head | — | Maryland |
| 35 | Alice Wyman | 41 | Daughter | Teacher | Maryland |
| 36 | Charles Wyman | 39 | Son | Painter | Maryland |
| 37 | Charlotte Wyman | 36 | Daughter | — | Maryland |
| 38 | John Ford | 36 | Head | Control Supt | Maryland |
| 39 | Frances O Ford | 34 | Wife | — | Maryland |
| 40 | John Jr Ford | 8 | Son | — | Maryland |
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)