MH
Mary Henderson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Mary Henderson across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a head (b.~1896), then head of a 6-person household.
Age 44
b. ~1896
Female
Head
Born: Pennsylvania
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Henderson |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 44 |
| Marital Status | Widowed |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Blawnox |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 3 |
| 1935 Residence | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Sharpsburg Borough |
| Est. Birth Year | ~1896 |
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 |
|---|---|---|---|---|
| Rita Henderson | Daughter | — | 11 | ~1929 |
| Ida Henderson | Daughter | — | 9 | ~1931 |
| Mary Henderson | Head | — | 44 | ~1896 |
| James Henderson | Son | — | 13 | ~1927 |
| Robert Henderson | Son | — | 17 | ~1923 |
| Carl Henderson | Son | — | 15 | ~1925 |
Census Appearances
1920
Allegheny, Pennsylvania
Other, age 21
Allegheny, Pennsylvania · implied b. ~1899 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Henders |
| Given Name | Mary E |
| Relationship to Head | Servant |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Servant |
| Industry | Private Home |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Allegheny, Pennsylvania
Other, age 32
Allegheny, Pennsylvania · implied b. ~1898 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Henderson |
| Given Name | Mary E. |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Age at First Marriage | 20 |
| 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
Head, age 44
Allegheny-County, Pennsylvania · implied b. ~1896 — 6 household members
| Surname | Henderson |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 44 |
| Marital Status | Widowed |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Blawnox |
| 1935 Residence (County) | Allegheny |
| Class of Worker | 0 |
| Highest Grade | No 3 |
| 1935 Residence | Pennsylvania |
| 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 Henderson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Henderson
Head · 1940 · age 44 · b. ~1896 · Pennsylvania
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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 — 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-t0627-03417-00492)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William Zygmunciah | 7 | Son | — | Pennsylvania |
| 2 | Anthony Zygmunciah | 5 | Son | — | Pennsylvania |
| 3 | Frank Zygmunciah | 4 | Son | — | Pennsylvania |
| 4 | Joseph Kaczmarczyk | 36 | Head | Laborer | Pennsylvania |
| 5 | Laura Kaczmarczyk | 30 | Wife | — | Poland |
| 6 | Frances Kaczmarczyk | 3 | Daughter | — | Pennsylvania |
| 7 | Steve Niedzielka | 57 | Boarder | Laborer | Poland |
| 8 | Steve Kaplan | 47 | Boarder | Laborer | Poland |
| 9 | Nicholas Ammer | 46 | Head | Laborer | Pennsylvania |
| 10 | Margaret Ammer | 46 | Wife | — | Pennsylvania |
| 11 | John Ab Ammer | 18 | Son | Laborer | Pennsylvania |
| 12 | Mary Henderson THIS PERSON | 44 | Head | — | Pennsylvania |
| 13 | Robert Henderson | 17 | Son | New Worker | Pennsylvania |
| 14 | Carl Henderson | 15 | Son | — | Pennsylvania |
| 15 | James Henderson | 13 | Son | — | Pennsylvania |
| 16 | Rita Henderson | 11 | Daughter | — | Pennsylvania |
| 17 | Ida Henderson | 9 | Daughter | — | Pennsylvania |
| 18 | Stanley Ulanowicz | 24 | Head | Laborer | Pennsylvania |
| 19 | Helen @ Ulanowicz | 19 | Wife | — | Pennsylvania |
| 20 | Robert Ulanowicz | 2 | Son | — | Pennsylvania |
| 21 | Victoria Ulanowicz | 51 | Mother | — | Poland |
| 22 | Grace @ Ullen | 43 | Head | — | Pennsylvania |
| 23 | Hillard, Clare Ullen | 51 | Boarder | Jack Hammerman | Pennsylvania |
| 24 | Julia @ Volcik | 63 | Head | — | Poland |
| 25 | Hanninger, Mary Volcik | 29 | Daughter | — | Pennsylvania |
| 26 | Hanninger, Charles Volcik | 6 | Grand-son | — | Pennsylvania |
| 27 | Fulke, Stella Volcik | 15 | Grand-daughter | — | New York |
| 28 | Zygmunt Switalski | 27 | Head | Food Press Operator | Pennsylvania |
| 29 | Mildred Switalski | 24 | Wife | — | Pennsylvania |
| 30 | Phillip Switalski | 5 | Son | — | Pennsylvania |
| 31 | Carol Switalski | 2 | Daughter | — | Pennsylvania |
| 32 | Patricia Switalski | 0 | Daughter | — | Pennsylvania |
| 33 | Sauer Filipchuk | 57 | Boarder | Laborer | Poland |
| 34 | Elmer Heichel | 28 | Boarder | Laborer | Pennsylvania |
| 35 | John @ Brandenberger | 68 | Head | — | Pennsylvania |
| 36 | Elizabeth Brandenberger | 11 | Wife | — | Pennsylvania |
| 37 | John Rogowski | 54 | Head | — | Poland |
| 38 | Sophie Rogowski | 39 | Wife | Homework | Poland |
| 39 | Leokadya Rogowski | 16 | Daughter | — | Pennsylvania |
| 40 | Irene Rogowski | 15 | Daughter | — | Pennsylvania |
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)