JK
John Kovach — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this John Kovach across the 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1922), then head of a 14-person household.
Age 18
b. ~1922
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Kovach |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Homestead |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Occupation | Laborer |
| Industry | Steel Mill |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 400 |
| Highest Grade | H-4 |
| 1935 Residence | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Laborer |
| Township / Ward | Homestead |
| Est. Birth Year | ~1922 |
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.
14 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Edward Kovach | Son | — | 8 | ~1932 |
| Helen Kovach | Daughter | — | 12 | ~1928 |
| Albert Kovach | Son | — | 10 | ~1930 |
| Anna Kovach | Other | — | 70 | ~1870 |
| Raymond Kovach | Son | — | 1 | ~1939 |
| John Kovach | Son | — | 18 | ~1922 |
| William Kovach | Son | — | 6 | ~1934 |
| Robert Kovach | Son | — | 4 | ~1936 |
| Mary Kovach | Daughter | — | 16 | ~1924 |
| Richard Kovach | Son | — | 2 | ~1938 |
| Mary Kovach | Spouse | — | 40 | ~1900 |
| Margaret Kovach | Daughter | — | 14 | ~1926 |
| John Kovach | Head | — | 45 | ~1895 |
| Elizabeth Kovach | Daughter | — | ~1940 |
Census Appearances
1930
Allegheny, Pennsylvania
Son, age 7
Allegheny, Pennsylvania · implied b. ~1923 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kovach |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Czechoslovakia |
| Can Read/Write | Yes |
| Mother Tongue | Slovak |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Son, age 18
Allegheny-County, Pennsylvania · implied b. ~1922 — 14 household members
| Surname | Kovach |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Homestead |
| 1935 Residence (County) | Allegheny |
| Occupation | Laborer |
| Industry | Steel Mill |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 400 |
| Highest Grade | H-4 |
| 1935 Residence | Pennsylvania |
| 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 John Kovach across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Kovach
Son · 1940 · age 18 · b. ~1922 · Pennsylvania
★ You are viewing this record
Sibling
Margaret Kovach
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Kovach
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Kovach
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Kovach
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Kovach
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Kovach
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Kovach
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Kovach
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Albert Kovach
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Kovach
Sibling · 1940 · age
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-t0627-03406-00418)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John Kovach | 45 | Head | Laborer | Czechoslovakia |
| 42 | Mary Kovach | 40 | Wife | — | Czechoslovakia |
| 43 | John Kovach THIS PERSON | 18 | Son | Laborer | Pennsylvania |
| 44 | Mary Kovach | 16 | Daughter | — | Pennsylvania |
| 45 | Margaret Kovach | 14 | Daughter | — | Pennsylvania |
| 46 | Helen Kovach | 12 | Daughter | — | Pennsylvania |
| 47 | Albert Kovach | 10 | Son | — | Pennsylvania |
| 48 | Edward Kovach | 8 | Son | — | Pennsylvania |
| 49 | William Kovach | 6 | Son | — | Pennsylvania |
| 50 | Robert Kovach | 4 | Son | — | Pennsylvania |
| 51 | Richard Kovach | 2 | Son | — | Pennsylvania |
| 52 | Raymond Kovach | 1 | Son | — | Pennsylvania |
| 53 | Elizabeth Kovach | 0 | Daughter | — | Pennsylvania |
| 54 | Anna Kovach | 70 | Mother | — | Czechoslovakia |
| 55 | John Sabol | 48 | Head | Laborer | Czechoslovakia |
| 56 | Mary Sabol | 45 | Wife | — | Czechoslovakia |
| 57 | John Sabol | 22 | Son | Laborer | Pennsylvania |
| 58 | Mary Sabol | 20 | Daughter | Stenographer | Pennsylvania |
| 59 | Anna Sabol | 18 | Daughter | Clerk | Pennsylvania |
| 60 | Margaret Sabol | 16 | Daughter | — | Pennsylvania |
| 61 | Helen Sabol | 14 | Daughter | — | Pennsylvania |
| 62 | Elizabeth Sabol | 12 | Daughter | — | Pennsylvania |
| 63 | Albert Sabol | 10 | Son | — | Pennsylvania |
| 64 | Edward Sabol | 8 | Son | — | Pennsylvania |
| 65 | William Sabol | 6 | Son | — | Pennsylvania |
| 66 | Robert Sabol | 4 | Son | — | Pennsylvania |
| 67 | Richard Sabol | 2 | Son | — | Pennsylvania |
| 68 | Raymond Sabol | 1 | Son | — | Pennsylvania |
| 69 | George Kovach | 50 | Head | Laborer | Czechoslovakia |
| 70 | Anna Kovach | 45 | Wife | — | Czechoslovakia |
| 71 | George Kovach | 24 | Son | Laborer | Pennsylvania |
| 72 | Anna Kovach | 22 | Daughter | Stenographer | Pennsylvania |
| 73 | Mary Kovach | 20 | Daughter | Clerk | Pennsylvania |
| 74 | Margaret Kovach | 18 | Daughter | Clerk | Pennsylvania |
| 75 | Helen Kovach | 16 | Daughter | — | Pennsylvania |
| 76 | Elizabeth Kovach | 14 | Daughter | — | Pennsylvania |
| 77 | Albert Kovach | 12 | Son | — | Pennsylvania |
| 78 | Edward Kovach | 10 | Son | — | Pennsylvania |
| 79 | William Kovach | 8 | Son | — | Pennsylvania |
| 80 | Robert Kovach | 6 | Son | — | 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)