MK
Mary Kovach — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Fayette-County, Pennsylvania
Our Model Tree links this Mary Kovach across the 1930 and 1940 US Censuses in Fayette-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1924), then head of a 11-person household.
Age 16
b. ~1924
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Fayette-County, Pennsylvania |
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Thompson #1 |
| 1935 Residence (County) | Fayette |
| Additional Details | |
| Occupation | New worker |
| Class of Worker | GW |
| Hours Worked | 24 |
| Income (1939) | 600 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | New Worker |
| Township / Ward | Thompson 1 |
| Est. Birth Year | ~1924 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Kovach | Daughter | — | 16 | ~1924 |
| Setnich Kovach | Other | — | 58 | ~1882 |
| Charles Kovach | Son | — | 5 | ~1935 |
| Mike Kovach | Son | — | 7 | ~1933 |
| James Kovach | Head | — | 44 | ~1896 |
| Matala Kovach | Other | — | 65 | ~1875 |
| John Kovach | Son | — | 18 | ~1922 |
| Eva Kovach | Daughter | — | 9 | ~1931 |
| Rose Kovach | Daughter | — | 3 | ~1937 |
| James Kovach | Son | — | 12 | ~1928 |
| Eva Kovach | Spouse | — | 34 | ~1906 |
Census Appearances
1930
Westmoreland, Pennsylvania
Daughter, age 5
Westmoreland, Pennsylvania · implied b. ~1925 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Yugoslavia |
| Mother's Birthplace | Yugoslavia |
| Can Read/Write | No |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Fayette-County, Pennsylvania
Daughter, age 16
Fayette-County, Pennsylvania · implied b. ~1924 — 11 household members
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Thompson #1 |
| 1935 Residence (County) | Fayette |
| Occupation | New worker |
| Class of Worker | GW |
| Hours Worked | 24 |
| Income (1939) | 600 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| 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 Kovach across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Kovach
Daughter · 1940 · age 16 · b. ~1924 · Pennsylvania
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Sibling
Mike Kovach
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Kovach
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Kovach
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Kovach
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rose Kovach
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eva Kovach
Sibling · 1940 · age 9
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 — Fayette-County, Pennsylvania
Open full size
1940 US Federal Census — Fayette-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03506-00926)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ignatz Ruer | 58 | Head | Coal Miner | Russia |
| 2 | Catherine Ruer | 52 | Wife | — | Poland |
| 3 | James Kovach | 44 | Head | Coal Miner | Hungary |
| 4 | Eva Kovach | 34 | Wife | — | Pennsylvania |
| 5 | John Kovach | 18 | Son | New Worker | Pennsylvania |
| 6 | Mary Kovach THIS PERSON | 16 | Daughter | New Worker | Pennsylvania |
| 7 | James Jr. Kovach | 12 | Son | — | Pennsylvania |
| 8 | Eva Kovach | 9 | Daughter | — | Pennsylvania |
| 9 | Mike Kovach | 7 | Son | — | Pennsylvania |
| 10 | Charles Kovach | 5 | Son | — | Pennsylvania |
| 11 | Rose Kovach | 3 | Daughter | — | Pennsylvania |
| 12 | Matala, Anna Kovach | 65 | Mother-in-law | — | Hungary |
| 13 | Setnich, George Kovach | 58 | Brother-in-law | Coal Miner | Hungary |
| 14 | John D. Geisel | 49 | Head | Coal Miner | Pennsylvania |
| 15 | Josephine Geisel | 47 | Wife | — | Pennsylvania |
| 16 | Florence Geisel | 25 | Daughter | New Worker | Pennsylvania |
| 17 | John Geisel | 20 | Son | New Worker | Pennsylvania |
| 18 | James Geisel | 17 | Son | New Worker | Pennsylvania |
| 19 | Henry Geisel | 14 | Son | — | Pennsylvania |
| 20 | Charles Geisel | 12 | Son | — | Pennsylvania |
| 21 | Donald Geisel | 8 | Son | — | Pennsylvania |
| 22 | Margaret Geisel | 6 | Daughter | — | Pennsylvania |
| 23 | George Kolesar | 22 | Head | New Worker | Pennsylvania |
| 24 | Dorothy Kolesar | 22 | Wife | — | Pennsylvania |
| 25 | Betty Ann Kolesar | 1 | Daughter | — | Pennsylvania |
| 26 | George Jr. Kolesar | 0 | Son | — | Pennsylvania |
| 27 | Morris Holliday | 32 | Head | Miner | Pennsylvania |
| 28 | Violet Holliday | 27 | Wife | — | Pennsylvania |
| 29 | Charlotte Holliday | 6 | Daughter | — | Pennsylvania |
| 30 | Ruby Holliday | 1 | Daughter | — | Pennsylvania |
| 31 | George Dickson | 56 | Head | Miner | Pennsylvania |
| 32 | Anna Dickson | 53 | Wife | — | New York |
| 33 | Grant Dickson | 23 | Son | Miner | Pennsylvania |
| 34 | Gilbert Dickson | 23 | Son | Miner | Pennsylvania |
| 35 | Edward Dickson | 20 | Son | New Worker | Pennsylvania |
| 36 | Sylvia Dickson | 14 | Daughter | — | Pennsylvania |
| 37 | Anna Tatarko | 45 | Head | — | Pennsylvania |
| 38 | Frank Tatarko | 17 | Son | — | Pennsylvania |
| 39 | William Tatarko | 16 | Son | — | Pennsylvania |
| 40 | John Tatarko | 13 | Son | — | Pennsylvania |
Related Census Records
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)