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Mary Armstrong — 1940 US Census Record
Model Tree available1940 United States Federal Census · Washington-County, Pennsylvania
Our Model Tree links this Mary Armstrong across the 1920, 1930 and 1940 US Censuses in Washington-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Charles & Sarah — first a daughter (b.~1917), then head of a 5-person household.
Age 23
b. ~1917
Female
Daughter
Born: Pennsylvania
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Washington-County, Pennsylvania |
| Surname | Armstrong |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Widowed |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Avella |
| 1935 Residence (County) | Washington |
| Additional Details | |
| Occupation | Maid |
| Industry | Private Home |
| Class of Worker | PW |
| Hours Worked | 18 |
| Income (1939) | 144 |
| Highest Grade | No 5 |
| 1935 Residence | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Maid |
| Township / Ward | Highland |
| Est. Birth Year | ~1917 |
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 Armstrong | Daughter | — | 23 | ~1917 |
| Frank Yolovich | Head | — | 51 | ~1889 |
| Robert Armstrong | Other | — | 4 | ~1936 |
| Harry Yolovich | Son | — | 13 | ~1927 |
| Nellie Yolovich | Spouse | — | 51 | ~1889 |
Census Appearances
1920
Westmoreland, Pennsylvania
Daughter, age 2
Westmoreland, Pennsylvania · implied b. ~1918 — 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 | 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
Westmoreland, Pennsylvania
Daughter, age 13
Westmoreland, Pennsylvania · implied b. ~1917 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Armstrong |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Washington-County, Pennsylvania
Daughter, age 23
Washington-County, Pennsylvania · implied b. ~1917 — 5 household members
| Surname | Armstrong |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Widowed |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Avella |
| 1935 Residence (County) | Washington |
| Occupation | Maid |
| Industry | Private Home |
| Class of Worker | PW |
| Hours Worked | 18 |
| Income (1939) | 144 |
| Highest Grade | No 5 |
| 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: father Charles Armstrong (~0.92 confidence) and mother Sarah Armstrong (~0.92 confidence) and father Frank Yolovich (~0.92 confidence) and mother Nellie Yolovich (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Charles Armstrong
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Sarah Armstrong
b. ~1884
Source mother
● Household
· direct · ~0.92
Father
Frank Yolovich
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Nellie Yolovich
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Armstrong
Daughter · 1940 · age 23 · b. ~1917 · Pennsylvania
★ You are viewing this record
Sibling
Harry Yolovich
Sibling · 1940 · age 13
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 — Washington-County, Pennsylvania
Open full size
1940 US Federal Census — Washington-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03624-00667)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Zapotocky | 57 | Wife | — | Czechoslovakia |
| 2 | Charles Zapotocky | 30 | Son | Coal Miner | Pennsylvania |
| 3 | Margaret Zapotocky | 21 | Daughter | New Worker | Pennsylvania |
| 4 | Katie Zapotocky | 19 | Daughter | New Worker | Pennsylvania |
| 5 | John Zapotocky | 17 | Son | Meatcutter | Pennsylvania |
| 6 | James Hotchkiss | 41 | Head | Coal Loader | Scotland |
| 7 | Janet Hotchkiss | 49 | Wife | — | Scotland |
| 8 | Irene Hotchkiss | 15 | Daughter | — | Pennsylvania |
| 9 | Thelma Hotchkiss | 12 | Daughter | — | Pennsylvania |
| 10 | David Shannon | 31 | Head | Coal Miner | Pennsylvania |
| 11 | Lois Mae Shannon | 10 | Daughter | — | Pennsylvania |
| 12 | Helen Lee Shannon | 8 | Daughter | — | Pennsylvania |
| 13 | Andy Szaller | 33 | Head | Snapper | Pennsylvania |
| 14 | Elizabeth Szaller | 29 | Wife | — | Pennsylvania |
| 15 | Elizabeth Ann Szaller | 3 | Daughter | — | Pennsylvania |
| 16 | Helen Marie Szaller | 2 | Daughter | — | Pennsylvania |
| 17 | Mike Ryder | 25 | Head | Coal Miner | Pennsylvania |
| 18 | Rose Ryder | 17 | Wife | — | Pennsylvania |
| 19 | Nelson Simon | 26 | Head | Coal Miner | Pennsylvania |
| 20 | Eva Simon | 27 | Wife | — | Pennsylvania |
| 21 | Andrew Simon | 5 | Daughter | — | Pennsylvania |
| 22 | Nelson Jr. Simon | 3 | Son | — | Pennsylvania |
| 23 | James Hunter | 38 | Lodger | Coal Miner | Pennsylvania |
| 24 | Frank Yolovich | 51 | Head | Coal Miner | Austria |
| 25 | Nellie Yolovich | 51 | Wife | — | Austria |
| 26 | Harry Yolovich | 13 | Son | — | Pennsylvania |
| 27 | Mary Armstrong THIS PERSON | 23 | Daughter | Maid | Pennsylvania |
| 28 | Robert Armstrong | 4 | Grandson | — | Pennsylvania |
| 29 | Steve Kocsis | 37 | Head | 1200 | Austria |
| 30 | Helen Kocsis | 29 | Wife | — | Pennsylvania |
| 31 | Patricia Kocsis | 11 | Daughter | — | Pennsylvania |
| 32 | June Kocsis | 9 | Son | — | Pennsylvania |
| 33 | Mary Kocsis | 8 | Daughter | — | Pennsylvania |
| 34 | Rosie Kocsis | 3 | Daughter | — | Pennsylvania |
| 35 | Albert Cole | 41 | Head | Motorman | England |
| 36 | Katherine Cole | 26 | Wife | — | Pennsylvania |
| 37 | James A. Cole | 13 | Son | — | Pennsylvania |
| 38 | Lillian Cole | 12 | Daughter | Cc Camp | Pennsylvania |
| 39 | Joseph Yanok | 25 | Head | Coal Miner | Pennsylvania |
| 40 | Nellie Yanok | 14 | Wife | — | 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)