MA
Mary Armstrong — 1940 US Census Record
Model Tree available1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Mary Armstrong across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Nettie & Robert — first a spouse (b.~1908), then head of a 4-person household.
Age 32
b. ~1908
Female
Spouse
Born: Pennsylvania
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Armstrong |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | East Liberty |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Highest Grade | H 4 |
| 1935 Residence | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Aspinwall Borough |
| Est. Birth Year | ~1908 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Nancy Armstrong | Daughter | — | 3 | ~1937 |
| Samuel Armstrong | Head | — | 32 | ~1908 |
| Ronald Armstrong | Son | — | 6 | ~1934 |
| Mary Armstrong | Spouse | — | 32 | ~1908 |
Census Appearances
1920
Allegheny, Pennsylvania
Daughter, age 10
Allegheny, Pennsylvania · implied b. ~1910 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Armstrong |
| Given Name | Mary A. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Pennsylvania |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Allegheny, Pennsylvania
Daughter, age 21
Allegheny, Pennsylvania · implied b. ~1909 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Armstrong |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Age at First Marriage | 21 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Pennsylvania |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Spouse, age 32
Allegheny-County, Pennsylvania · implied b. ~1908 — 4 household members
| Surname | Armstrong |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | East Liberty |
| 1935 Residence (County) | Allegheny |
| Highest Grade | H 4 |
| 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 Armstrong across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Nettie Armstrong (~0.92 confidence) and father Robert Armstrong (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Nettie Armstrong
b. ~1881
Source mother
● Household
· direct · ~0.92
Father
Robert Armstrong
b. ~1882
Source father
● Household
· direct · ~0.92
This person
Anchor record
Mary Armstrong
Spouse · 1940 · age 32 · b. ~1908 · Pennsylvania
★ You are viewing this record
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-t0627-03397-00062)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lena Dugan | 52 | Wife | — | Pennsylvania |
| 2 | Katherine Dugan | 26 | Daughter | Clerk | Pennsylvania |
| 3 | Ruth Dugan | 25 | Daughter | New Work | Pennsylvania |
| 4 | Martha Dugan | 24 | Daughter | Collector | Pennsylvania |
| 5 | Samuel S. Dugan | 21 | Son | Bagger | Pennsylvania |
| 6 | Dorothy Dugan | 19 | Daughter | New Work | Pennsylvania |
| 7 | Albert Nonnweiler | 50 | Head | Rougher | Pennsylvania |
| 8 | Walter Nonnweiler | 22 | Son | Road Laborer | Pennsylvania |
| 9 | Paul C. Ruden | 36 | Head | Trainman | Pennsylvania |
| 10 | Jessie A. Ruden | 42 | Wife | — | Georgia |
| 11 | Anita R. Ruden | 12 | Daughter | — | Pennsylvania |
| 12 | Samuel Armstrong | 32 | Head | Shearman | Pennsylvania |
| 13 | Mary Armstrong THIS PERSON | 32 | Wife | — | Pennsylvania |
| 14 | Ronald Armstrong | 6 | Son | — | Pennsylvania |
| 15 | Nancy Armstrong | 3 | Daughter | — | Pennsylvania |
| 16 | William Corbett | 27 | Head | Machinist | New York |
| 17 | Caroline Corbett | 20 | Wife | — | Pennsylvania |
| 18 | Katherine Mcnamara | 70 | Head | — | England |
| 19 | Edward Heckathorne | 53 | Head | Truck Driver | Pennsylvania |
| 20 | Katherine Heckathorne | 50 | Wife | — | Pennsylvania |
| 21 | Katherine Heckathorne | 32 | Daughter | Operator | Pennsylvania |
| 22 | Helen Heckathorne | 23 | Daughter | Stenographer | Pennsylvania |
| 23 | Edward Heckathorne | 15 | Son | — | Pennsylvania |
| 24 | Patricia Heckathorne | 14 | Daughter | — | Pennsylvania |
| 25 | Joan Heckathorne | 9 | Daughter | — | Pennsylvania |
| 26 | Mary Mcgarry | 37 | Head | Finisher | Pennsylvania |
| 27 | Joseph Mcgarry | 39 | Brother | Laborer | Pennsylvania |
| 28 | Myron Mcgarry | 30 | Brother | Laborer | Pennsylvania |
| 29 | Louis C. Hetzel | 50 | Head | Laborer | Pennsylvania |
| 30 | Viola Hetzel | 47 | Wife | — | Pennsylvania |
| 31 | William Hetzel | 17 | Son | — | Pennsylvania |
| 32 | John Hatton | 75 | Head | — | England |
| 33 | Gertrude Hatton | 64 | Wife | — | England |
| 34 | Emily Bradbury | 81 | Sister | — | England |
| 35 | Terese Christ | 67 | Head | Seamstress | Pennsylvania |
| 36 | Ann Christ | 61 | Sister | — | Pennsylvania |
| 37 | Edward Beet | 62 | Head | Roadwork | Pennsylvania |
| 38 | Stella Beet | 59 | Wife | Cook | Pennsylvania |
| 39 | Joseph B. Kirk | 42 | Lodger | Clerk | Pennsylvania |
| 40 | Charles Gratz | 32 | Head | Clerk | Pennsylvania |
Pedigree Summary
Mary
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)