MK
Mary Kovach — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Mary Kovach across the 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1927), then head of a 8-person household.
Age 13
b. ~1927
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Etna Borough |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Highest Grade | 6 |
| 1935 Residence | Same Place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Etna Borough |
| Est. Birth Year | ~1927 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Anna Kovach | Spouse | — | 52 | ~1888 |
| John Kovach | Son | — | 23 | ~1917 |
| Joseph Kovach | Son | — | 26 | ~1914 |
| Michael Kovach | Head | — | 54 | ~1886 |
| Katherine Kovach | Daughter | — | 15 | ~1925 |
| Mary Kovach | Daughter | — | 13 | ~1927 |
| Margaret Kovach | Daughter | — | 25 | ~1915 |
| Peter Kovach | Son | — | 21 | ~1919 |
Census Appearances
1930
Allegheny, Pennsylvania
Daughter, age 3
Allegheny, Pennsylvania · implied b. ~1927 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kovacs |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Czechoslovakia |
| Mother's Birthplace | Czechoslovakia |
| Mother Tongue | English |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Daughter, age 13
Allegheny-County, Pennsylvania · implied b. ~1927 — 8 household members
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Etna Borough |
| 1935 Residence (County) | Allegheny |
| Highest Grade | 6 |
| 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 13 · b. ~1927 · Pennsylvania
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Sibling
Joseph Kovach
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Peter Kovach
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Kovach
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Kovach
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Katherine Kovach
Sibling · 1940 · age 15
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 — 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-t0627-03403-00747)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | George Boldy | 54 | Son | Street Improvement | Pennsylvania |
| 2 | Jane Boldy | 63 | Daughter | — | Pennsylvania |
| 3 | Earl Mc Coy | 42 | Head | Shipper | Pennsylvania |
| 4 | Ethel Mc Coy | 42 | Wife | — | Pennsylvania |
| 5 | Robert Mc Coy | 14 | Son | — | Pennsylvania |
| 6 | Eleanor Mc Coy | 12 | Daughter | — | Pennsylvania |
| 7 | Lee Schwan | 37 | Son-in-law | Property Clerk | Pennsylvania |
| 8 | Joseph Howard | 67 | Head | Laborer | Pennsylvania |
| 9 | Edith Howard | 67 | Wife | — | Pennsylvania |
| 10 | Nancy Howard | 32 | Daughter | Mail Clerk | Pennsylvania |
| 11 | Elmer Byerly | 51 | Head | Brakeman | Pennsylvania |
| 12 | Marion Byerly | 49 | Wife | — | Pennsylvania |
| 13 | Elmer Jr Byerly | 22 | Son | Laborer | Pennsylvania |
| 14 | Thomas Byerly | 18 | Son | Car Washer | Pennsylvania |
| 15 | Mary Byerly | 11 | Daughter | — | Pennsylvania |
| 16 | William Jarvis | 53 | Head | Laborer | Pennsylvania |
| 17 | Anna Jarvis | 52 | Wife | — | Pennsylvania |
| 18 | Byron Jarvis | 15 | Son | — | Pennsylvania |
| 19 | Anna Jarvis | 12 | Daughter | — | Pennsylvania |
| 20 | Michael Kovach | 54 | Head | Laborer | Yugo Slavia |
| 21 | Anna Kovach | 52 | Wife | — | Yugo Slavia |
| 22 | Joseph Kovach | 26 | Son | Laborer | Pennsylvania |
| 23 | Margaret Kovach | 25 | Daughter | Packer | Pennsylvania |
| 24 | John Kovach | 23 | Son | Laborer | Pennsylvania |
| 25 | Peter Kovach | 21 | Son | Laborer | Pennsylvania |
| 26 | Katherine Kovach | 15 | Daughter | — | Pennsylvania |
| 27 | Mary Kovach THIS PERSON | 13 | Daughter | — | Pennsylvania |
| 28 | James Derry | 55 | Head | Laborer | Pennsylvania |
| 29 | Louise Derry | 57 | Wife | — | Pennsylvania |
| 30 | James Derry | 20 | Son | Finisher | Pennsylvania |
| 31 | Robert Derry | 19 | Son | Waterman | Pennsylvania |
| 32 | Ruth Derry | 26 | Daughter | — | Pennsylvania |
| 33 | Mary L. Derry | 22 | Daughter | Stenographer | Pennsylvania |
| 34 | Walter Clark | 23 | Head | Apprentice Bricklayer | Pennsylvania |
| 35 | Jean Clark | 21 | Wife | — | Pennsylvania |
| 36 | Gustav Taylor | 55 | Head | Brakeman | Pennsylvania |
| 37 | Howard Taylor | 36 | Son | Baker | Pennsylvania |
| 38 | Harry A. Smith | 45 | Head | Laborer | Pennsylvania |
| 39 | Loretta Smith | 44 | Wife | — | Pennsylvania |
| 40 | Harry J. Smith | 18 | Son | New Worker | 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)