MB
Mary Brown — 1940 US Census Record
Model Tree available1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Mary Brown across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents John & John — first a daughter (b.~1918), then head of a 3-person household.
Age 22
b. ~1918
Female
Daughter
Born: PENNSYLVANIA
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | BROWN |
| Given Name | MARY M |
| Relationship to Head | DAUGHTER |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | PENNSYLVANIA |
| 1935 Residence (City) | SHALER |
| 1935 Residence (County) | ALLEGHENY |
| Additional Details | |
| Highest Grade | C-3 |
| 1935 Residence | SAME HOUSE |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Shaler |
| 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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Brown | Daughter | — | 22 | ~1918 |
| Mary Brown | Head | — | 48 | ~1892 |
| John Brown | Son | — | 19 | ~1921 |
Census Appearances
1920
Allegheny, Pennsylvania
Daughter, age 2
Allegheny, Pennsylvania · implied b. ~1918 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brown |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Allegheny, Pennsylvania
Daughter, age 12
Allegheny, Pennsylvania · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brown |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Daughter, age 22
Allegheny-County, Pennsylvania · implied b. ~1918 — 3 household members
| Surname | BROWN |
| Given Name | MARY M |
| Relationship to Head | DAUGHTER |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | PENNSYLVANIA |
| 1935 Residence (City) | SHALER |
| 1935 Residence (County) | ALLEGHENY |
| Highest Grade | C-3 |
| 1935 Residence | SAME HOUSE |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 Brown across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Brown (~0.92 confidence) and father John Brown (~0.92 confidence) and mother Mary Brown (~0.92 confidence) and mother Mary Brown (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Brown
b. ~1893
Source father
● Household
· direct · ~0.92
Father
John Brown
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Mary Brown
b. ~1893
Source mother
● Household
· direct · ~0.92
Mother
Mary Brown
b. ~1892
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Brown
Daughter · 1940 · age 22 · b. ~1918 · Pennsylvania
★ You are viewing this record
Sibling
John Brown
Sibling · 1940 · age 19
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 — Allegheny-County, Pennsylvania
Open full size
1940 US Federal Census — Allegheny-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03417-00285)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Bernard G Lennon | 14 | SON | — | PENNSYLVANIA |
| 42 | Dolores E Lennon | 12 | DAUGHTER | — | PENNSYLVANIA |
| 43 | Thomas A Lennon | 10 | SON | — | PENNSYLVANIA |
| 44 | Sylvia A Lennon | 5 | DAUGHTER | — | PENNSYLVANIA |
| 45 | George A Weiss | 27 | SON-IN-LAW | Machine Operator | PENNSYLVANIA |
| 46 | Sarah M Weiss | 20 | DAUGHTER | Domestic | PENNSYLVANIA |
| 47 | Isadore Malinowski | 65 | HEAD | — | YUGOSLAVIA |
| 48 | Kristina Malinowski | 53 | WIFE | — | YUGOSLAVIA |
| 49 | Frank A Malinowski | 26 | SON | Laborer | PENNSYLVANIA |
| 50 | Rose A Malinowski | 24 | DAUGHTER | — | PENNSYLVANIA |
| 51 | Adolph A Malinowski | 21 | SON | Machine Operator | PENNSYLVANIA |
| 52 | Bernard C Malinowski | 15 | SON | — | PENNSYLVANIA |
| 53 | Mary A Brown | 48 | HEAD | Owner | PENNSYLVANIA |
| 54 | Mary M Brown THIS PERSON | 22 | DAUGHTER | — | PENNSYLVANIA |
| 55 | John A Brown | 19 | SON | Clerk | PENNSYLVANIA |
| 56 | Herman Steigerwald | 39 | HEAD | Truck Driver | PENNSYLVANIA |
| 57 | Elsie Steigerwald | 34 | WIFE | — | PENNSYLVANIA |
| 58 | Norman Steigerwald | 13 | SON | — | PENNSYLVANIA |
| 59 | Elsie Steigerwald | 9 | DAUGHTER | — | PENNSYLVANIA |
| 60 | Donald Steigerwald | 7 | SON | — | PENNSYLVANIA |
| 61 | Adolph Feil | 39 | HEAD | Butcher | GERMANY |
| 62 | Anna Feil | 38 | WIFE | Owner | GERMANY |
| 63 | Adolph Jr Feil | 13 | SON | — | PENNSYLVANIA |
| 64 | Carl Feil | 12 | SON | — | PENNSYLVANIA |
| 65 | John Feil | 7 | SON | — | PENNSYLVANIA |
| 66 | Anna Feil | 1 | DAUGHTER | — | PENNSYLVANIA |
| 67 | William H Garrett | 68 | HEAD | — | OHIO |
| 68 | Josephine Koviak | 67 | HEAD | — | POLAND |
| 69 | Joseph Koviak | 38 | SON | Paperhanger | PENNSYLVANIA |
| 70 | Josephine Koviak | 36 | DAUGHTER | Candy Clerk | PENNSYLVANIA |
| 71 | Helen Koviak | 29 | DAUGHTER | Telephone Operator | PENNSYLVANIA |
| 72 | Anthony Koviak | 27 | SON | Truck Driver | PENNSYLVANIA |
| 73 | James C Debold | 33 | HEAD | File Clerk | PENNSYLVANIA |
| 74 | Emma M Debold | 26 | WIFE | — | PENNSYLVANIA |
| 75 | James E Debold | 3 | SON | — | PENNSYLVANIA |
| 76 | Joseph L Toth | 27 | HEAD | Laborer | PENNSYLVANIA |
| 77 | Lucille Toth | 27 | WIFE | Twister | PENNSYLVANIA |
| 78 | William J Toth | 1 | SON | — | PENNSYLVANIA |
| 79 | Mary C Lennon | 48 | HEAD | — | PENNSYLVANIA |
| 80 | Rita J Lennon | 20 | DAUGHTER | — | PENNSYLVANIA |
Pedigree Summary
Mary + 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)