MK
Mary Kovach — 1940 US Census Record
Model Tree available1940 United States Federal Census · Erie-County, New York
Our Model Tree links this Mary Kovach across the 1920, 1930 and 1940 US Censuses in Erie-County, New York (XGBoost, ~Confirmed), with identified parents Anthony & Joseph — first a daughter (b.~1915), then head of a 4-person household.
Age 25
b. ~1915
Female
Daughter
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Erie-County, New York |
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Lackawanna city |
| 1935 Residence (County) | Erie |
| Additional Details | |
| Occupation | Stenographer |
| Industry | Steel mill |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1207 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Stenographer |
| Township / Ward | Lackawanna City |
| Est. Birth Year | ~1915 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Kovach | Spouse | — | 56 | ~1884 |
| John Kovach | Son | — | 19 | ~1921 |
| Mary Kovach | Daughter | — | 25 | ~1915 |
| Joseph Kovach | Head | — | 59 | ~1881 |
Census Appearances
1920
Erie, New …
Daughter, age 5
Erie, New York · implied b. ~1915 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kovacs |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Hungary |
| Mother's Birthplace | Hungary |
| Occupation | none |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Erie, New …
Daughter, age 15
Erie, New York · implied b. ~1915 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kovach |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Hungary |
| Mother's Birthplace | Hungary |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Erie-County, New …
Daughter, age 25
Erie-County, New York · implied b. ~1915 — 4 household members
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Lackawanna city |
| 1935 Residence (County) | Erie |
| Occupation | Stenographer |
| Industry | Steel mill |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1207 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Anthony Kovacs (~0.92 confidence) and father Joseph Kovach (~0.92 confidence) and mother Mary Kovach (~0.92 confidence) and mother Teresa Kovacs (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Anthony Kovacs
b. ~1883
Source father
● Household
· direct · ~0.92
Father
Joseph Kovach
b. ~1881
Source father
● Household
· direct · ~0.92
Mother
Mary Kovach
b. ~1884
Source mother
● Household
· direct · ~0.92
Mother
Teresa Kovacs
b. ~1887
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Kovach
Daughter · 1940 · age 25 · b. ~1915 · New York
★ You are viewing this record
Sibling
John Kovach
Sibling · 1940 · age 19
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 — Erie-County, New York
Open full size
1940 US Federal Census — Erie-County, New York
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-02529-00433)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | August Jr. Litwinish | 18 | Son | Laborer | New York |
| 42 | Joseph Kovach | 59 | Head | Carpenter | Hungary |
| 43 | Mary Kovach | 56 | Wife | — | Hungary |
| 44 | Mary Kovach THIS PERSON | 25 | Daughter | Stenographer | New York |
| 45 | John Kovach | 19 | Son | — | New York |
| 46 | John Ruta | 52 | Head | Machinist | Poland |
| 47 | Mary Ruta | 42 | Wife | — | Poland |
| 48 | Peter O'Rourke | 51 | Head | Policeman | Pennsylvania |
| 49 | Veronica O'Rourke | 35 | Wife | — | New York |
| 50 | Stanley Radwan | 48 | Head | Hooker | Poland |
| 51 | Felicia Radwan | 47 | Wife | — | Poland |
| 52 | Matthew Radwan | 23 | Son | Grinder | New York |
| 53 | Chester Radwan | 18 | Son | — | New York |
| 54 | Genevieve Radwan | 17 | Daughter | — | New York |
| 55 | Aloysius Radwan | 14 | Son | — | New York |
| 56 | Stanley Jr. Radwan | 12 | Son | — | New York |
| 57 | Helen Radwan | 10 | Daughter | — | New York |
| 58 | Richard Radwan | 9 | Son | — | New York |
| 59 | Daniel Radwan | 5 | Son | — | New York |
| 60 | Herman Potratz | 31 | Head | Hooker | New Jersey |
| 61 | Mary Potratz | 26 | Wife | — | Nova Scotia |
| 62 | Marylou Potratz | 5 | Daughter | — | New York |
| 63 | Sharon Potratz | 2 | Daughter | — | New York |
| 64 | Stanley Serafin | 41 | Head | Lieutenant | New York |
| 65 | Bessie Serafin | 38 | Wife | — | New York |
| 66 | Virginia Serafin | 17 | Daughter | — | New York |
| 67 | Stanley Jr. Serafin | 10 | Son | — | New York |
| 68 | Bernard Michalek | 34 | Head | Proprietor | New York |
| 69 | Bertha Michalek | 36 | Wife | — | New York |
| 70 | Robert Michalek | 2 | Son | — | New York |
| 71 | Anne Dengler | 68 | Mother | Proprietress | New York |
| 72 | Joseph Mokski | 29 | Head | Heater | New York |
| 73 | Mary Mokski | 29 | Wife | — | New York |
| 74 | Donald Mokski | 5 | Son | — | New York |
| 75 | Eugenia Mokski | 4 | Daughter | — | New York |
| 76 | Andrew Huder | 50 | Head | Car Repairman | Slovakia |
| 77 | Susanne Huder | 49 | Wife | — | Slovakia |
| 78 | Anna Huder | 17 | Daughter | — | New York |
| 79 | Susanne Huder | 15 | Daughter | — | Illinois |
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)