MK
Mary Kovach — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Lucas, Ohio
Our Model Tree links this Mary Kovach across the 1930 and 1940 US Censuses in Lucas, Ohio (XGBoost, ~Confirmed) — first a daughter (b.~1914), then head of a 12-person household.
Age 16
b. ~1914
Female
Daughter
Born: Ohio
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Lucas, Ohio |
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Czechoslovakia |
| Mother's Birthplace | Czechoslovakia |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Township / Ward | Toledo |
| Est. Birth Year | ~1914 |
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.
12 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Irene Kovach | Daughter | — | ~1930 | |
| George Kovach | Son | — | 6 | ~1924 |
| John Kovach | Son | — | 18 | ~1912 |
| Elizabeth Kovach | Daughter | — | 12 | ~1918 |
| Margaret Kovach | Daughter | — | 10 | ~1920 |
| Mary Kovach | Spouse | — | 40 | ~1890 |
| Helen Kovach | Daughter | — | 14 | ~1916 |
| Stephen Kovach | Son | — | 2 | ~1928 |
| Joseph Kovach | Son | — | 4 | ~1926 |
| Mary Kovach | Daughter | — | 16 | ~1914 |
| Anna Kovach | Daughter | — | 8 | ~1922 |
| John Kovach | Head | — | 45 | ~1885 |
Census Appearances
1930
Lucas, Ohio
Daughter, age 16
Lucas, Ohio · implied b. ~1914 — 12 household members
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Czechoslovakia |
| Mother's Birthplace | Czechoslovakia |
| Can Read/Write | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Lucas-County, Ohio
Daughter, age 26
Lucas-County, Ohio · implied b. ~1914 — 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 | 26 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Toledo |
| 1935 Residence (County) | Lucas |
| Occupation | Housework |
| Industry | Private home |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 104 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Kovach
Daughter · 1930 · age 16 · b. ~1914 · Ohio
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Sibling
Joseph Kovach
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stephen Kovach
Sibling · 1930 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Irene Kovach
Sibling · 1930 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Kovach
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Kovach
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Kovach
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Kovach
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Kovach
Sibling · 1930 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Kovach
Sibling · 1930 · age 10
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 — Lucas, Ohio
Open full size
1930 US Federal Census — Lucas, Ohio
Page Contents
50 people indexed on this census page (ia:1930:ohiocensus00reel1888:0495)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | S J Boyd | 57 | Head | — | Ohio |
| 2 | Anna Boyd | 55 | Wife | — | Ohio |
| 3 | Mildred Boyd | 22 | Daughter | Teacher | Ohio |
| 4 | Richard Boyd | 18 | Son | — | Ohio |
| 5 | Joseph Mott | 45 | Head | Laborer | Ohio |
| 6 | Alice Mott | 40 | Wife | — | Ohio |
| 7 | Joseph Jr Mott | 14 | Son | — | Ohio |
| 8 | Robert Mott | 12 | Son | — | Ohio |
| 9 | William Mott | 10 | Son | — | Ohio |
| 10 | Mary Mott | 8 | Daughter | — | Ohio |
| 11 | John Mott | 6 | Son | — | Ohio |
| 12 | James Mott | 4 | Son | — | Ohio |
| 13 | Helen Mott | 2 | Daughter | — | Ohio |
| 14 | George Mott | 0 | Son | — | Ohio |
| 15 | John Kovach | 45 | Head | Laborer | Czechoslovakia |
| 16 | Mary Kovach | 40 | Wife | — | Czechoslovakia |
| 17 | John Jr Kovach | 18 | Son | Laborer | Ohio |
| 18 | Mary Kovach THIS PERSON | 16 | Daughter | — | Ohio |
| 19 | Helen Kovach | 14 | Daughter | — | Ohio |
| 20 | Elizabeth Kovach | 12 | Daughter | — | Ohio |
| 21 | Margaret Kovach | 10 | Daughter | — | Ohio |
| 22 | Anna Kovach | 8 | Daughter | — | Ohio |
| 23 | George Kovach | 6 | Son | — | Ohio |
| 24 | Joseph Kovach | 4 | Son | — | Ohio |
| 25 | Stephen Kovach | 2 | Son | — | Ohio |
| 26 | Irene Kovach | 0 | Daughter | — | Ohio |
| 27 | Charles Cooper | 42 | Head | Laborer | Pennsylvania |
| 28 | Beulah Cooper | 38 | Wife | — | Pennsylvania |
| 29 | Barbara Cooper | 13 | Daughter | — | Pennsylvania |
| 30 | Charles Jr Cooper | 9 | Son | — | Ohio |
| 31 | Robert Cooper | 7 | Son | — | Ohio |
| 32 | Alice Cooper | 5 | Daughter | — | Ohio |
| 33 | James Cooper | 3 | Son | — | Ohio |
| 34 | William Cooper | 1 | Son | — | Ohio |
| 35 | Charles Mcdevitt | 35 | Head | Laborer | Ohio |
| 36 | Anna Mcdevitt | 30 | Wife | — | Ohio |
| 37 | Charles Jr Mcdevitt | 8 | Son | — | Ohio |
| 38 | Robert Mcdevitt | 6 | Son | — | Ohio |
| 39 | Mary Mcdevitt | 4 | Daughter | — | Ohio |
| 40 | James Mcdevitt | 2 | Son | — | Ohio |
| 41 | Alice Mcdevitt | 0 | Daughter | — | Ohio |
| 42 | John Miller | 40 | Head | Laborer | Ohio |
| 43 | Mary Miller | 35 | Wife | — | Ohio |
| 44 | John Jr Miller | 12 | Son | — | Ohio |
| 45 | Robert Miller | 10 | Son | — | Ohio |
| 46 | Alice Miller | 8 | Daughter | — | Ohio |
| 47 | James Miller | 6 | Son | — | Ohio |
| 48 | Mary Miller | 4 | Daughter | — | Ohio |
| 49 | George Miller | 2 | Son | — | Ohio |
| 50 | Helen Miller | 0 | Daughter | — | 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)