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 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a head (b.~1870), then head of a 2-person household.
Age 70
b. ~1870
Male
Head
Born: Austria
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Kovach |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 70 |
| Marital Status | Widowed |
| Birthplace | Austria |
| 1935 Residence (City) | Homestead |
| 1935 Residence (County) | Allegheny |
| Naturalization Status | Naturalized |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 0 |
| 1935 Residence | Same Place |
| Birth Country | Austria |
| Birthplace (normalized) | austria |
| Township / Ward | Homestead |
| Est. Birth Year | ~1870 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Kovach | Head | — | 70 | ~1870 |
| Mary Kovach | Daughter | — | 27 | ~1913 |
Census Appearances
1920
Westmoreland, Pennsylvania
Head, age 54
Westmoreland, Pennsylvania · implied b. ~1866 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kovach |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Austria |
| Year of Immigration | 1900 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Austria |
| Mother's Birthplace | Austria |
| Occupation | Laborer |
| Industry | Steel Mill |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Slovak |
| Home Owned/Rented | R |
| Birth Country | Austria |
| Year of Naturalization | 1910 |
| Birthplace (normalized) | austria |
1930
Allegheny, Pennsylvania
Head, age 64
Allegheny, Pennsylvania · implied b. ~1866 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kovac |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 64 |
| Marital Status | Married |
| Birthplace | Austria |
| Naturalization Status | Alien |
| Year of Immigration | 1900 |
| Age at First Marriage | 40 |
| Father's Birthplace | Austria |
| Mother's Birthplace | Austria |
| Occupation | Laborer |
| Industry | Steel Mill |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Magyar |
| Home Owned/Rented | O |
| Home Value / Rent | 5,600 |
| Veteran | No |
| Birth Country | Austria |
| Birthplace (normalized) | austria |
1940
Allegheny-County, Pennsylvania
Head, age 70
Allegheny-County, Pennsylvania · implied b. ~1870 — 2 household members
| Surname | Kovach |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 70 |
| Marital Status | Widowed |
| Birthplace | Austria |
| 1935 Residence (City) | Homestead |
| 1935 Residence (County) | Allegheny |
| Naturalization Status | Naturalized |
| Income (1939) | 0 |
| Highest Grade | No 0 |
| 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 John Kovach across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
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This person
Anchor record
John Kovach
Head · 1940 · age 70 · b. ~1870 · Pennsylvania
★ You are viewing this record
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-t0627-03406-00174)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Vesta Martin | 39 | Lodger | Laborer | Virginia |
| 42 | Mary Johnson | 25 | Wife | — | Alabama |
| 43 | Burl Frazier | 57 | Lodger | Miner | South Carolina |
| 44 | Evelyn Boykin | 42 | Head | Housework | Virginia |
| 45 | Clara Barnes | 37 | Lodger | Housework | Virginia |
| 46 | Agnes Jamerson | 23 | Lodger | Waitress | Pennsylvania |
| 47 | Edward Covington | 47 | Lodger | Manager | Pennsylvania |
| 48 | Emma Banks | 45 | Lodger | Dressmaker | Virginia |
| 49 | George Barnett | 24 | Lodger | Laborer | Georgia |
| 50 | William Barnett | 56 | Head | Laborer | Virginia |
| 51 | Annie Barnett | 45 | Wife | — | Virginia |
| 52 | Mary Mahatta | 70 | Head | — | Austria |
| 53 | John Kovach THIS PERSON | 70 | Head | — | Austria |
| 54 | Mary Kovach | 27 | Daughter | Clerk | Pennsylvania |
| 55 | Genevieve Judkins | 31 | Head | — | Virginia |
| 56 | Glenavey Lewis | 33 | Lodger | — | Alabama |
| 57 | Henry Blizzard | 34 | Lodger | Poultry Dresser | Virginia |
| 58 | Burl Hamilton | 35 | Lodger | Laborer | South Carolina |
| 59 | Mike Salko | 37 | Head | Laborer | Slovakia |
| 60 | Sophie Salko | 33 | Wife | — | Czechoslovakia |
| 61 | Mary Salko | 13 | Daughter | — | Pennsylvania |
| 62 | Joseph Marinko | 36 | Head | Laborer | Slovakia |
| 63 | Annie Marinko | 31 | Wife | — | Czechoslovakia |
| 64 | Joseph Marinko | 11 | Son | — | Pennsylvania |
| 65 | John Marinko | 8 | Son | — | Pennsylvania |
| 66 | Andrew Marinko | 4 | Son | — | Pennsylvania |
| 67 | Micheal Rosco | 46 | Head | Rigger | New Jersey |
| 68 | Anna Rosco | 41 | Wife | — | Austria |
| 69 | Bertha Rosco | 21 | Daughter | Waitress | Pennsylvania |
| 70 | Marie Rosco | 18 | Daughter | Waitress | Pennsylvania |
| 71 | Micheal Rosco | 17 | Son | Laborer | New Jersey |
| 72 | Elizabeth Rosco | 14 | Daughter | — | Pennsylvania |
| 73 | John Rosco | 12 | Son | — | Pennsylvania |
| 74 | Anna Rosco | 10 | Daughter | — | Pennsylvania |
| 75 | Joseph Rosco | 7 | Son | — | Pennsylvania |
| 76 | Rose Marie Rosco | 5 | Daughter | — | Pennsylvania |
| 77 | Steve Gugy | 67 | Head | — | Slovakia |
| 78 | Susie Gugy | 66 | Wife | — | Slovakia |
| 79 | Paul Gugy | 36 | Son | Clerk | Pennsylvania |
| 80 | Mary Gugy | 22 | Daughter | 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)