JK
John Kovach — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cuyahoga, Ohio
Our Model Tree links this John Kovach across the 1930 and 1940 US Censuses in Cuyahoga, Ohio (XGBoost, ~Confirmed) — first a son (b.~1909), then head of a 9-person household.
Age 21
b. ~1909
Male
Son
Born: Czechoslovakia
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cuyahoga, Ohio |
| Surname | Kovach |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Czechoslovakia |
| Naturalization Status | Naturalized |
| Year of Immigration | 1911 |
| Father's Birthplace | Czechoslovakia |
| Mother's Birthplace | Czechoslovakia |
| Additional Details | |
| Occupation | Welder |
| Industry | Torch Shop |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Czech |
| Birth Country | Czechoslovakia |
| Birthplace (normalized) | czechoslovakia |
| Occupation | Welder |
| Township / Ward | Cleveland City |
| Est. Birth Year | ~1909 |
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.
9 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Anna Kovach | Daughter | — | 17 | ~1913 |
| John Kovach | Son | — | 21 | ~1909 |
| Mary Kovach | Spouse | — | 42 | ~1888 |
| Elizabeth Kovach | Daughter | — | 10 | ~1920 |
| John Kovach | Head | — | 47 | ~1883 |
| Margaret Kovach | Daughter | — | 3 | ~1927 |
| Melvina Kovach | Daughter | — | 15 | ~1915 |
| Andrew Kovach | Son | — | 12 | ~1918 |
| Michael Kovach | Son | — | 19 | ~1911 |
Census Appearances
1930
Cuyahoga, Ohio
Son, age 21
Cuyahoga, Ohio · implied b. ~1909 — 9 household members
| Surname | Kovach |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Czechoslovakia |
| Naturalization Status | Naturalized |
| Year of Immigration | 1911 |
| Father's Birthplace | Czechoslovakia |
| Mother's Birthplace | Czechoslovakia |
| Occupation | Welder |
| Industry | Torch Shop |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Czech |
| Birth Country | Czechoslovakia |
| Birthplace (normalized) | czechoslovakia |
1940
Lorain-County, Ohio
Head, age 31
Lorain-County, Ohio · implied b. ~1909
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Kovacs |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Czechoslovakia |
| 1935 Residence (City) | Cleveland |
| 1935 Residence (County) | Cuyahoga |
| Naturalization Status | Naturalized |
| Occupation | Welder |
| Industry | Welding factory |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1200 |
| Highest Grade | No 4 |
| 1935 Residence | Ohio |
| Birth Country | Czechoslovakia |
| Birthplace (normalized) | czechoslovakia |
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 · 1930 · age 21 · b. ~1909 · Ohio
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Sibling
Melvina Kovach
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Andrew Kovach
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Kovach
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Kovach
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Kovach
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Kovach
Sibling · 1930 · age 3
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
1930 US Federal Census — Cuyahoga, Ohio
Open full size
1930 US Federal Census — Cuyahoga, Ohio
Page Contents
50 people indexed on this census page (ia:1930:ohiocensus00reel1780:0372)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Lawrence Cohen | 2 | Son | — | Ohio |
| 52 | Samuel Wasser | 34 | Head | Huckster | Russia |
| 53 | Minnie Wasser | 33 | Wife | — | Russia |
| 54 | Irving Wasser | 5 | Son | — | Ohio |
| 55 | Isaac Melamed | 39 | Head | Carpenter | Russia |
| 56 | Molly Melamed | 36 | Wife | — | Russia |
| 57 | Maynard Melamed | 5 | Son | — | Ohio |
| 58 | Charlotte Melamed | 3 | Daughter | — | Ohio |
| 59 | William Melamed | 35 | Head | Carpenter | Russia |
| 60 | Eva Melamed | 63 | Mother | — | Russia |
| 61 | John Kovach | 47 | Head | Laborer | Czechoslovakia |
| 62 | Mary Kovach | 42 | Wife | — | Czechoslovakia |
| 63 | John Jr. Kovach THIS PERSON | 21 | Son | Welder | Czechoslovakia |
| 64 | Michael Kovach | 19 | Son | Trimmer | Pennsylvania |
| 65 | Anna Kovach | 17 | Daughter | Trimmer | Pennsylvania |
| 66 | Melvina Kovach | 15 | Daughter | — | Pennsylvania |
| 67 | Andrew Kovach | 12 | Son | — | Pennsylvania |
| 68 | Elizabeth Kovach | 10 | Daughter | — | Pennsylvania |
| 69 | Margaret Kovach | 3 | Daughter | — | Ohio |
| 70 | Louis Weinstein | 49 | Head | Peddler | Russia |
| 71 | Ida Weinstein | 36 | Wife | — | Russia |
| 72 | Fannie Weinstein | 14 | Daughter | — | Pennsylvania |
| 73 | Vivian Weinstein | 12 | Daughter | — | Pennsylvania |
| 74 | Anna Weinstein | 11 | Daughter | — | Ohio |
| 75 | Sidney Weinstein | 4 | Son | — | Ohio |
| 76 | Sam Kossow | 38 | Head | Painter | Russia |
| 77 | Rose Kossow | 38 | Wife | — | Russia |
| 78 | Molly Kossow | 17 | Daughter | — | Canada-English |
| 79 | Annie Kossow | 15 | Daughter | — | New York |
| 80 | Esther Kossow | 12 | Daughter | — | Ohio |
| 81 | Albert Kossow | 5 | Son | — | Ohio |
| 82 | Jacob Epstein | 38 | Head | Truck Driver | Russia |
| 83 | Goldy Epstein | 37 | Wife | — | Rumania |
| 84 | Irving Epstein | 13 | Son | — | New York |
| 85 | George Epstein | 11 | Son | — | New York |
| 86 | Max Bentoff | 29 | Head | Painter | Poland |
| 87 | Lillian Bentoff | 26 | Wife | — | Poland |
| 88 | Judith Bentoff | 3 | Daughter | — | Ohio |
| 89 | Max Appel | 33 | Brother-in-law | Store Keeper | Poland |
| 90 | Eva Appel | 32 | Sister-in-law | — | Poland |
| 91 | Sam Norr | 47 | Head | Tailor | Lithuania |
| 92 | Mary Norr | 37 | Wife | — | Russia |
| 93 | Leo Norr | 16 | Son | — | New York |
| 94 | Norton Norr | 9 | Son | — | Ohio |
| 95 | Jenny Estrein | 70 | Mother-in-law | — | Russia |
| 96 | Moses Estrein | 29 | Brother-in-law | Barber | Russia |
| 97 | Tom Corabara | 37 | Head | Laborer | Italy |
| 98 | Carmella Corabara | 28 | Wife | — | Italy |
| 99 | Josephine Corabara | 10 | Daughter | — | Ohio |
| 100 | Tony Corabara | 7 | Son | — | Ohio |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)