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Mary Brennan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Montgomery-County, Indiana
Our Model Tree links this Mary Brennan across the 1920, 1930 and 1940 US Censuses in Montgomery-County, Indiana (XGBoost, ~Confirmed), with identified parents James & Nora — first a daughter (b.~1899), then head of a 5-person household.
Age 41
b. ~1899
Female
Daughter
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Montgomery-County, Indiana |
| Surname | Brennan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 41 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Crawfordsville |
| 1935 Residence (County) | Montgomery |
| Additional Details | |
| Occupation | Stenographer |
| Industry | Bank |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 1200 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Stenographer |
| Township / Ward | Crawfordsville |
| Est. Birth Year | ~1899 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Brennan | Daughter | — | 41 | ~1899 |
| Helen Brennan | Daughter | — | 37 | ~1903 |
| Nora Brennan | Head | — | 72 | ~1868 |
| Robert Brennan | Son | — | 43 | ~1897 |
| Hugh Brennan | Son | — | 32 | ~1908 |
Census Appearances
1920
Montgomery, Indiana
Daughter, age 23
Montgomery, Indiana · implied b. ~1897 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Occupation | Stenographer |
| Industry | Lawyer Office |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Montgomery, Indiana
Daughter, age 30
Montgomery, Indiana · implied b. ~1900 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Occupation | Stenographer |
| Industry | Utility Office |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Montgomery-County, Indiana
Daughter, age 41
Montgomery-County, Indiana · implied b. ~1899 — 5 household members
| Surname | Brennan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 41 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Crawfordsville |
| 1935 Residence (County) | Montgomery |
| Occupation | Stenographer |
| Industry | Bank |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 1200 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 2 locations, using XGBoost record linkage. Identified parents: father James Brennan (~0.92 confidence) and mother Nora Brennan (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Brennan
b. ~1863
Source father
● Household
· direct · ~0.92
Mother
Nora Brennan
b. ~1869
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Brennan
Daughter · 1940 · age 41 · b. ~1899 · Indiana
★ You are viewing this record
Sibling
Robert Brennan
Sibling · 1940 · age 43
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Brennan
Sibling · 1940 · age 37
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hugh Brennan
Sibling · 1940 · age 32
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 — Montgomery-County, Indiana
Open full size
1940 US Federal Census — Montgomery-County, Indiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01080-00366)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mayme Ecker | 21 | Daughter | — | Pennsylvania |
| 42 | Darnell Ecker | 16 | Son | — | Indiana |
| 43 | Robert Parnell | 32 | Head | Truck Driver | Indiana |
| 44 | Thelma Parnell | 32 | Wife | — | Indiana |
| 45 | Mary Lou Parnell | 10 | Daughter | — | Indiana |
| 46 | Thomas G. Parnell | 7 | Son | — | Indiana |
| 47 | Lloyd Bayless | 30 | Head | Linotype Op. | Indiana |
| 48 | Genilee Bayless | 30 | Wife | — | Indiana |
| 49 | Lawrence Bayless | 9 | Son | — | Indiana |
| 50 | John Slattery | 45 | Head | Plasterer | Indiana |
| 51 | Elizabeth Slattery | 44 | Wife | — | Indiana |
| 52 | Cathleen Slattery | 18 | Daughter | — | Indiana |
| 53 | Philip Slattery | 13 | Son | — | Indiana |
| 54 | Kenneth Hamilton | 32 | Head | Production Mgr | Iowa |
| 55 | Esther Hamilton | 28 | Wife | Secretary | Indiana |
| 56 | Thomas Harper | 35 | Head | Salesman | Indiana |
| 57 | Neva Harper | 35 | Wife | — | Indiana |
| 58 | Charles Harper | 3 | Son | — | Indiana |
| 59 | Hugo Ingersoll | 41 | Head | Mechanic | Indiana |
| 60 | Edna Ingersoll | 41 | Wife | Binder Worker | Indiana |
| 61 | John Ingersoll | 19 | Son | — | Indiana |
| 62 | Jean Ingersoll | 14 | Daughter | — | Indiana |
| 63 | Leslie Ingersoll | 12 | Son | — | Indiana |
| 64 | Dora Church | 67 | Head | — | Indiana |
| 65 | Ed H. Church | 69 | Brother | Blacksmith | Indiana |
| 66 | Jessie D. Mason | 74 | Head | — | Ohio |
| 67 | Ralph Cowan | 25 | Head | Pressman | Indiana |
| 68 | Sarah Cowan | 28 | Wife | — | Illinois |
| 69 | Charles Tomlinson | 38 | Head | Presser | Indiana |
| 70 | Thelma Tomlinson | 32 | Wife | Stenographer | Indiana |
| 71 | Alita G. Jackson | 56 | Head | Genl Office Work | Indiana |
| 72 | Emma J. Swank | 66 | Head | — | Indiana |
| 73 | Nora Brennan | 72 | Head | — | Indiana |
| 74 | Robert Brennan | 43 | Son | Janitor | Indiana |
| 75 | Mary Brennan THIS PERSON | 41 | Daughter | Stenographer | Indiana |
| 76 | Helen Brennan | 37 | Daughter | Office Worker | Indiana |
| 77 | Hugh Brennan | 32 | Son | Pressman | Indiana |
| 78 | Harley Reed | 38 | Head | Pressman | Indiana |
| 79 | Laurene Reed | 40 | Wife | — | Indiana |
| 80 | Althea M. Reed | 15 | Daughter | — | Indiana |
Pedigree Summary
Mary + 3 siblings
Gen 1 · 2 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)