MK
Mary Kovach — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Lorain-County, Ohio
Our Model Tree links this Mary Kovach across the 1920, 1930 and 1940 US Censuses in Lorain-County, Ohio (XGBoost, ~Confirmed) — first a spouse (b.~1887), then head of a 3-person household.
Age 53
b. ~1887
Female
Spouse
Born: Russia
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Lorain-County, Ohio |
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Russia |
| 1935 Residence (City) | City of Lorain |
| 1935 Residence (County) | Lorain |
| Naturalization Status | Alien |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 0 |
| 1935 Residence | Same place |
| Birth Country | Russia |
| Birthplace (normalized) | russia |
| Township / Ward | City Of Lorain |
| Est. Birth Year | ~1887 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Michael Kovach | Head | — | 57 | ~1883 |
| Mary Kovach | Spouse | — | 53 | ~1887 |
| Anna Kovach | Daughter | — | 21 | ~1919 |
Census Appearances
1920
Lorain, Ohio
Spouse, age 35
Lorain, Ohio · implied b. ~1885 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Russia |
| Father's Birthplace | Russia |
| Mother's Birthplace | Russia |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Polish |
| Birth Country | Russia |
| Year of Naturalization | al |
| Birthplace (normalized) | russia |
1930
Lorain, Ohio
Other, age 45
Lorain, Ohio · implied b. ~1885 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Russia |
| Naturalization Status | Naturalized |
| Year of Immigration | 1910 |
| Age at First Marriage | 16 |
| Father's Birthplace | Russia |
| Mother's Birthplace | Russia |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | Russian |
| Birth Country | Russia |
| Birthplace (normalized) | russia |
1940
Lorain-County, Ohio
Spouse, age 53
Lorain-County, Ohio · implied b. ~1887 — 3 household members
| Surname | Kovach |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Russia |
| 1935 Residence (City) | City of Lorain |
| 1935 Residence (County) | Lorain |
| Naturalization Status | Alien |
| Income (1939) | 0 |
| Highest Grade | No 0 |
| 1935 Residence | Same place |
| Birth Country | Russia |
| Birthplace (normalized) | russia |
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 53 · b. ~1887 · Ohio
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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 — Lorain-County, Ohio
Open full size
1940 US Federal Census — Lorain-County, Ohio
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03102-00462)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Robert S (Jr) Demeter | 21 | Grandson | — | Ohio |
| 42 | Margaret M Demeter | 18 | Granddaughter | — | Ohio |
| 43 | Edna L Demeter | 14 | Granddaughter | — | Ohio |
| 44 | Jacob Rekich | 37 | Head | Furnace Operator | Yugoslavia |
| 45 | Anna Rekich | 35 | Wife | — | Yugoslavia |
| 46 | Louise Rekich | 16 | Daughter | — | Ohio |
| 47 | Robert Rekich | 11 | Son | — | Ohio |
| 48 | Jacob Jr Rekich | 7 | Son | — | Ohio |
| 49 | Michel Crlenjak | 47 | Head | Pipe Weighman | Yugoslavia |
| 50 | Eva Crlenjak | 42 | Wife | — | Yugoslavia |
| 51 | George Crlenjak | 25 | Son | Pipe Inspector | Minnesota |
| 52 | Frank S Crlenjak | 19 | Son | Truck Driver | Ohio |
| 53 | Joseph Crlenjak | 12 | Son | — | Minnesota |
| 54 | Steve Soth | 29 | Head | Pipe Tester | Bulgaria |
| 55 | Mary Soth | 23 | Wife | — | Ohio |
| 56 | Joan Soth | 6 | Daughter | — | Ohio |
| 57 | Maryann Soth | 2 | Daughter | — | Ohio |
| 58 | Michael Kovach | 57 | Head | Laborer | Russia |
| 59 | Mary Kovach THIS PERSON | 53 | Wife | — | Russia |
| 60 | Anna Kovach | 21 | Daughter | Housework | Missouri |
| 61 | Frank P Kucic | 35 | Head | Clerk | Ohio |
| 62 | Helen V Kucic | 30 | Wife | — | Pennsylvania |
| 63 | Charlene Kucic | 11 | Daughter | — | Ohio |
| 64 | Louretta Kucic | 7 | Daughter | — | Ohio |
| 65 | Frank P Jr Kucic | 6 | Son | — | Ohio |
| 66 | Mike Blank | 53 | Head | — | Germany |
| 67 | Francis Blank | 48 | Wife | — | Germany |
| 68 | Zechelan Geldzen | 62 | Head | Pump Tender | Poland |
| 69 | Catharine Geldzen | 59 | Wife | — | Poland |
| 70 | William Geldzen | 27 | Son | Battery Man | Missouri |
| 71 | Mary Geldzen | 24 | Son | Color Boy (Asst) | Ohio |
| 72 | Alex Geldzen | 21 | Son | Buffer | Ohio |
| 73 | Michel Geldzen | 18 | Son | — | Ohio |
| 74 | Andrew Kordelecki | 58 | Head | Pipe Threader | Poland |
| 75 | Mike Kordelecki | 29 | Son | Stenciler | Ohio |
| 76 | Walter Kordelecki | 22 | Son | Scarf Helper | Ohio |
| 77 | Benjamin Kordelecki | 31 | Son | Brakeman | Ohio |
| 78 | Mary Kordelecki | 27 | Daughter | — | Ohio |
| 79 | Benjamin Jr Kordelecki | 6 | Grandson | — | Ohio |
| 80 | Mary Jean Kordelecki | 4 | Granddaughter | — | Ohio |
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)