MK
Mary Kovach — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, New Jersey
Our Model Tree links this Mary Kovach across the 1920, 1930 and 1940 US Censuses in Middlesex-County, New Jersey (XGBoost, ~Confirmed) — first a spouse (b.~1891), then head of a 6-person household.
Age 49
b. ~1891
Female
Spouse
Born: Austria
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, New Jersey |
| Surname | Kovach |
| Given Name | Mary D. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Austria |
| 1935 Residence (City) | Carteret Borough |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Naturalized |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Austria |
| Birthplace (normalized) | austria |
| Township / Ward | Carteret Borough |
| Est. Birth Year | ~1891 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Thomas Kovach | Son | — | 17 | ~1923 |
| Edward Kovach | Son | — | 11 | ~1929 |
| Thomas Kovach | Head | — | 53 | ~1887 |
| Mary Kovach | Spouse | — | 49 | ~1891 |
| John Kovach | Son | — | 19 | ~1921 |
| Margaret Kovach | Daughter | — | 12 | ~1928 |
Census Appearances
1920
Middlesex, New …
Spouse, age 26
Middlesex, New Jersey · implied b. ~1894 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Austria |
| Year of Immigration | 1911 |
| Naturalization Status | Alien |
| Father's Birthplace | Austria |
| Mother's Birthplace | Austria |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Slovak |
| Birth Country | Austria |
| Birthplace (normalized) | austria |
1930
Middlesex, New …
Spouse, age 37
Middlesex, New Jersey · implied b. ~1893 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kovacs |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Austria |
| Naturalization Status | Naturalized |
| Year of Immigration | 1910 |
| Age at First Marriage | 24 |
| Father's Birthplace | Austria |
| Mother's Birthplace | Austria |
| Occupation | NONE |
| Can Read/Write | Yes |
| Mother Tongue | Slavish |
| Birth Country | Austria |
| Birthplace (normalized) | austria |
1940
Middlesex-County, New …
Spouse, age 49
Middlesex-County, New Jersey · implied b. ~1891 — 6 household members
| Surname | Kovach |
| Given Name | Mary D. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Austria |
| 1935 Residence (City) | Carteret Borough |
| 1935 Residence (County) | Middlesex |
| Naturalization Status | Naturalized |
| Class of Worker | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Austria |
| Birthplace (normalized) | austria |
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.
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This person
Anchor record
Mary Kovach
Spouse · 1940 · age 49 · b. ~1891 · New Jersey
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Middlesex-County, New Jersey
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1940 US Federal Census — Middlesex-County, New Jersey
Page Contents
41 people indexed on this census page (nara:1940:m-t0627-02358-00317)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John B. Diana | 25 | Head | Laborer | New Jersey |
| 2 | Mary Diana | 21 | Wife | — | New Jersey |
| 3 | John Diana | 0 | Son | — | New Jersey |
| 4 | John Albin | 56 | Head | Shipwright | Portugal |
| 5 | Berta Albin | 46 | Wife | — | Portugal |
| 6 | Joseph Jr. Lucas | 30 | Head | C. B. Clerk | New Jersey |
| 7 | John Lucas | 24 | Wife | — | New Jersey |
| 8 | Cecilia Lucas | 3 | Daughter | — | New Jersey |
| 9 | Joanne Margaret Lucas | 2 | Daughter | — | New Jersey |
| 10 | John Lepko | 38 | Head | Laborer | Hungary |
| 11 | Julia Lepko | 32 | Wife | Trimming | Hungary |
| 12 | John Lepko | 10 | Son | — | New Jersey |
| 13 | Yolanda Lepko | 5 | Daughter | — | New Jersey |
| 14 | Stephen Lepko | 27 | Brother | Clerk | Illinois |
| 15 | Michael Nemani | 46 | Head | Laborer | Hungary |
| 16 | Martha Nemani | 32 | Wife | Machine Op | Hungary |
| 17 | Matilda Nemani | 11 | Daughter | — | Hungary |
| 18 | Louis P. Nagy | 41 | Head | Shipper | Hungary |
| 19 | Louise Nagy | 40 | Wife | — | Hungary |
| 20 | Agnes Nagy | 20 | Son | Welder | Hungary |
| 21 | Frank Nagy | 14 | Son | — | Hungary |
| 22 | Elizabeth Nagy | 12 | Daughter | — | Hungary |
| 23 | Louis Nagy | 6 | Son | — | New Jersey |
| 24 | Gustav D. Mulak | 36 | Head | Fertilizer | Hungary |
| 25 | Ethel Mulak | 39 | Wife | — | Hungary |
| 26 | Gustav Mulak | 9 | Son | — | Hungary |
| 27 | Ethel Mulak | 8 | Daughter | — | New Jersey |
| 28 | Zoltan Mulak | 6 | Son | — | New Jersey |
| 29 | Thomas Kovach | 53 | Head | Sorter | Hungary |
| 30 | Mary D. Kovach THIS PERSON | 49 | Wife | — | Austria |
| 31 | John Kovach | 19 | Son | Sorter | Pennsylvania |
| 32 | Thomas Jr. Kovach | 17 | Son | — | New Jersey |
| 33 | Margaret Kovach | 12 | Daughter | — | New Jersey |
| 34 | Edward Kovach | 11 | Son | — | New Jersey |
| 35 | Joseph Augusto | 32 | Head | Operator | Portugal |
| 36 | Adele Augusto | 25 | Wife | Operator | Mass. |
| 37 | Marcella Augusto | 7 | Daughter | — | New Jersey |
| 38 | Joseph Soares | 32 | Head | Burner | Portugal |
| 39 | Adeline Soares | 31 | Wife | — | Portugal |
| 40 | Joseph Jr. Soares | 1 | Son | — | New Jersey |
| 41 | Julius Brasil | 41 | Head | Foreman | New Jersey |
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)