MK
Mary Kovach — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Montgomery-County, Pennsylvania
Our Model Tree links this Mary Kovach across the 1930 and 1940 US Censuses in Montgomery-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 12-person household.
Age 17
b. ~1923
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Montgomery-County, Pennsylvania |
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pottstown |
| 1935 Residence (County) | Montgomery |
| Additional Details | |
| Occupation | Housework |
| Industry | Private Family |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 126 |
| Highest Grade | H-1 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Housework |
| Township / Ward | Pottstown |
| Est. Birth Year | ~1923 |
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.
12 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Paul Kovach | Son | — | 10 | ~1930 |
| Theresa Kovach | Daughter | — | 11 | ~1929 |
| John Kovach | Son | — | 18 | ~1922 |
| Dorothy Kovach | Daughter | — | 15 | ~1925 |
| Bernice Kovach | Daughter | — | 7 | ~1933 |
| James Kovach | Son | — | 12 | ~1928 |
| Regina Kovach | Daughter | — | 3 | ~1937 |
| Mary Kovach | Spouse | — | 42 | ~1898 |
| Mary Kovach | Daughter | — | 17 | ~1923 |
| John Kovach | Head | — | 46 | ~1894 |
| Margaret Kovach | Daughter | — | 21 | ~1919 |
| Elizabeth Kovach | Daughter | — | 20 | ~1920 |
Census Appearances
1930
Chester, Pennsylvania
Other, age 7
Chester, Pennsylvania · implied b. ~1923 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Granddaughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Hungary |
| Mother's Birthplace | Hungary |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Montgomery-County, Pennsylvania
Daughter, age 17
Montgomery-County, Pennsylvania · implied b. ~1923 — 12 household members
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pottstown |
| 1935 Residence (County) | Montgomery |
| Occupation | Housework |
| Industry | Private Family |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 126 |
| Highest Grade | H-1 |
| 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.
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This person
Anchor record
Mary Kovach
Daughter · 1940 · age 17 · b. ~1923 · Pennsylvania
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Sibling
Regina Kovach
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Theresa Kovach
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernice Kovach
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Kovach
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Kovach
Sibling · 1940 · age 15
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
James Kovach
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Kovach
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Kovach
Sibling · 1940 · age 10
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 — Montgomery-County, Pennsylvania
Open full size
1940 US Federal Census — Montgomery-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03583-00383)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Kovach | 24 | Daughter | Machine Operator | Pennsylvania |
| 2 | Adeline Kovach | 21 | Daughter | Machine Operator | Pennsylvania |
| 3 | Verna Kovach | 17 | Daughter | — | Pennsylvania |
| 4 | Agnes Kovach | 14 | Daughter | — | Pennsylvania |
| 5 | Irene Kovach | 11 | Daughter | — | Pennsylvania |
| 6 | John Kovach | 46 | Head | Molder | Czechoslovakia |
| 7 | Mary Kovach | 42 | Wife | — | Czechoslovakia |
| 8 | Margaret Kovach | 21 | Daughter | Hairdresser | Pennsylvania |
| 9 | Elizabeth Kovach | 20 | Daughter | Elastic Machine Operator | Pennsylvania |
| 10 | John Jr. Kovach | 18 | Son | Lathe Machine Operator | Pennsylvania |
| 11 | Mary Kovach THIS PERSON | 17 | Daughter | Housework | Pennsylvania |
| 12 | Dorothy Kovach | 15 | Daughter | — | Pennsylvania |
| 13 | James Kovach | 12 | Son | — | Pennsylvania |
| 14 | Theresa Kovach | 11 | Daughter | — | Pennsylvania |
| 15 | Paul Kovach | 10 | Son | — | Pennsylvania |
| 16 | Bernice Kovach | 7 | Daughter | — | Pennsylvania |
| 17 | Regina Kovach | 3 | Daughter | — | Pennsylvania |
| 18 | John Cehlar | 62 | Head | Laborer | Czechoslovakia |
| 19 | Mary Cehlar | 62 | Wife | — | Czechoslovakia |
| 20 | Anna Cehlar | 26 | Daughter | Machine Operator | Pennsylvania |
| 21 | Betty Cehlar | 19 | Daughter | — | Pennsylvania |
| 22 | Andrew Horvat | 60 | Head | Machine Operator | Czechoslovakia |
| 23 | Anna Horvat | 58 | Wife | — | Czechoslovakia |
| 24 | Michael Horvat | 32 | Son | Proprietor | Pennsylvania |
| 25 | Mary Horvat | 26 | Daughter | Seamer | Pennsylvania |
| 26 | Frank T. Horvat | 21 | Son | Machine Operator | Pennsylvania |
| 27 | Helen Horvat | 17 | Daughter | — | Pennsylvania |
| 28 | Mary Hovanec | 31 | Lodger | Inspector | New York |
| 29 | Andrew Potpinko | 45 | Head | Die Caster | Czechoslovakia |
| 30 | Mary Potpinko | 41 | Wife | Trimmer | Czechoslovakia |
| 31 | Andrew Jr. Potpinko | 18 | Son | Tapper | Pennsylvania |
| 32 | Dorothy Potpinko | 14 | Daughter | — | Pennsylvania |
| 33 | Helen Potpinko | 12 | Daughter | — | Pennsylvania |
| 34 | Paul Potpinko | 9 | Son | — | Pennsylvania |
| 35 | Andrew Jr. Potpinko | 6 | Son | — | Pennsylvania |
| 36 | Paul Pollick | 31 | Head | Machinist | Pennsylvania |
| 37 | Anna Pollick | 28 | Wife | — | Pennsylvania |
| 38 | Eugene Pollick | 9 | Son | — | Pennsylvania |
| 39 | Barbara Wacuk | 52 | Head | — | Poland |
| 40 | George Waziy | 22 | Son | Riveter'S Helper | 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)