MK
Mary Kovach — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Greene-County, Pennsylvania
Our Model Tree links this Mary Kovach across the 1930 and 1940 US Censuses in Greene-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1925), then head of a 9-person household.
Age 15
b. ~1925
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Greene-County, Pennsylvania |
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Rice's Landing |
| 1935 Residence (County) | Greene |
| Additional Details | |
| Highest Grade | 7 |
| 1935 Residence | Same Place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Rices Landing |
| Est. Birth Year | ~1925 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Elizabeth Kovach | Daughter | — | 11 | ~1929 |
| Andy Kovach | Son | — | 24 | ~1916 |
| Victor Kovach | Son | — | 18 | ~1922 |
| Mary Kovach | Daughter | — | 15 | ~1925 |
| Bertha Kovach | Spouse | — | 50 | ~1890 |
| George Kovach | Son | — | 9 | ~1931 |
| Julia Kovach | Daughter | — | 27 | ~1913 |
| Mike Kovach | Head | — | 57 | ~1883 |
| Helen Kovach | Daughter | — | 20 | ~1920 |
Census Appearances
1930
Allegheny, Pennsylvania
Daughter, age 4
Allegheny, Pennsylvania · implied b. ~1926 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Czechoslovakia |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Greene-County, Pennsylvania
Daughter, age 15
Greene-County, Pennsylvania · implied b. ~1925 — 9 household members
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Rice's Landing |
| 1935 Residence (County) | Greene |
| Highest Grade | 7 |
| 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 15 · b. ~1925 · Pennsylvania
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Sibling
Victor Kovach
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Julia Kovach
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Kovach
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Andy Kovach
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Kovach
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Kovach
Sibling · 1940 · age 20
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 — Greene-County, Pennsylvania
Open full size
1940 US Federal Census — Greene-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03512-00165)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Edward Johnson | 21 | Head | Salesman | Pennsylvania |
| 2 | Velma Johnson | 18 | Wife | — | Pennsylvania |
| 3 | Annette Johnson | 0 | Daughter | — | Pennsylvania |
| 4 | John Alford | 64 | Head | Farmer | Pennsylvania |
| 5 | Jessie Alford | 56 | Wife | — | Pennsylvania |
| 6 | Sherman Alford | 25 | Son | — | Pennsylvania |
| 7 | Alvin B. Keifer | 41 | Head | Proprietor | Pennsylvania |
| 8 | Anna B. Keifer | 45 | Wife | — | Pennsylvania |
| 9 | Anthony Marinch | 40 | Head | Miner | Yugoslavia |
| 10 | Catherine Marinch | 32 | Wife | — | Pennsylvania |
| 11 | Catherine Marinch | 15 | Daughter | — | Pennsylvania |
| 12 | Anthony Jr. Marinch | 13 | Son | — | Pennsylvania |
| 13 | John Marinch | 10 | Son | — | Pennsylvania |
| 14 | William Marinch | 3 | Son | — | Pennsylvania |
| 15 | Shirley Ann Marinch | 2 | Daughter | — | Pennsylvania |
| 16 | Viola Bice | 46 | Head | Asst. Post Master | Pennsylvania |
| 17 | Delia Bice | 41 | Wife | — | Illinois |
| 18 | Shirley M. Bice | 18 | Son | — | Pennsylvania |
| 19 | Esther Bice | 16 | Daughter | — | Pennsylvania |
| 20 | Sam Braden | 72 | Head | Farmer | Pennsylvania |
| 21 | Rachael Braden | 47 | Wife | — | Pennsylvania |
| 22 | John Kovach | 24 | Head | Miner | Pennsylvania |
| 23 | Dorothy Kovach | 19 | Wife | — | Pennsylvania |
| 24 | John Jr. Kovach | 0 | Son | — | Pennsylvania |
| 25 | Mike Kovach | 57 | Head | Miner | Czechoslovakia |
| 26 | Bertha Kovach | 50 | Wife | — | Czechoslovakia |
| 27 | Julia Kovach | 27 | Daughter | — | Pennsylvania |
| 28 | Andy Kovach | 24 | Son | Miner | Pennsylvania |
| 29 | Helen Kovach | 20 | Daughter | Maid | Pennsylvania |
| 30 | Victor Kovach | 18 | Son | — | Pennsylvania |
| 31 | Mary Kovach THIS PERSON | 15 | Daughter | — | Pennsylvania |
| 32 | Elizabeth Kovach | 11 | Daughter | — | Pennsylvania |
| 33 | George Kovach | 9 | Son | — | Pennsylvania |
| 34 | John Yezorek | 35 | Head | Miner | Czechoslovakia |
| 35 | Anne Yezorek | 34 | Wife | — | Czechoslovakia |
| 36 | Mary Yezorek | 15 | Daughter | — | Pennsylvania |
| 37 | John Jr. Yezorek | 13 | Son | — | Pennsylvania |
| 38 | Michael Yezorek | 12 | Son | — | Pennsylvania |
| 39 | Margaret Yezorek | 11 | Daughter | — | Pennsylvania |
| 40 | Rose Yezorek | 10 | 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)