FK
Frank Kowalski — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Bay-County, Michigan
Our Model Tree links this Frank Kowalski across the 1920, 1930 and 1940 US Censuses in Bay-County, Michigan (XGBoost, ~Confirmed) — first a head (b.~1892), then head of a 3-person household.
Age 48
b. ~1892
Male
Head
Born: Michigan
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Bay-County, Michigan |
| Surname | Kowalski |
| Given Name | Frank |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Michigan |
| 1935 Residence (City) | Bay City |
| 1935 Residence (County) | Bay |
| Additional Details | |
| Occupation | Clerk |
| Industry | Post Office |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 266 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Occupation | Clerk |
| Township / Ward | Bay City |
| Est. Birth Year | ~1892 |
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 Frank | Age | Birth yr |
|---|---|---|---|---|
| Frank Kowalski | Head | — | 48 | ~1892 |
| Alice Kowalski | Daughter | — | 19 | ~1921 |
| Angeline Kowalski | Spouse | — | 42 | ~1898 |
Census Appearances
1920
Bay, Michigan
Head, age 27
Bay, Michigan · implied b. ~1893 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Frank |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Michigan |
| Father's Birthplace | German Poland |
| Mother's Birthplace | German Poland |
| Occupation | clerk |
| Industry | U.S. Post Office |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1930
Bay, Michigan
Head, age 38
Bay, Michigan · implied b. ~1892 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Frank |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Michigan |
| Age at First Marriage | 25 |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | Mail Clerk |
| Industry | U.S.A. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 15.00 |
| Radio Set | R |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1940
Bay-County, Michigan
Head, age 48
Bay-County, Michigan · implied b. ~1892 — 3 household members
| Surname | Kowalski |
| Given Name | Frank |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Michigan |
| 1935 Residence (City) | Bay City |
| 1935 Residence (County) | Bay |
| Occupation | Clerk |
| Industry | Post Office |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 266 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
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 Frank Kowalski across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Frank Kowalski
Head · 1940 · age 48 · b. ~1892 · Michigan
★ 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 — Bay-County, Michigan
Open full size
1940 US Federal Census — Bay-County, Michigan
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01728-00199)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Clara Bala | 21 | Daughter | Branch Maker | Michigan |
| 42 | Anthony Konieczny | 50 | Head | Labor | Poland |
| 43 | Marie Konieczny | 48 | Wife | — | Poland |
| 44 | Joseph Konieczny | 18 | Son | Labor | Michigan |
| 45 | Anna Konieczny | 30 | Daughter | Cutter | Michigan |
| 46 | Rainey Konieczny | 8 | Grandson | — | Michigan |
| 47 | Stanley Glowacki | 27 | Head | Labor | Michigan |
| 48 | Katherine Glowacki | 29 | Wife | Branch Maker | Ohio |
| 49 | Theresa Glowacki | 3 | Daughter | — | Michigan |
| 50 | Joan Glowacki | 1 | Daughter | — | Michigan |
| 51 | Edward Kozkowski | 20 | Lodger | Clerk | Michigan |
| 52 | Barney Mudarczak | 44 | Head | Automobile Worker | Michigan |
| 53 | Theresa Mudarczak | 42 | Wife | — | Michigan |
| 54 | Edmund Mudarczak | 21 | Son | — | Michigan |
| 55 | Eugenia Mudarczak | 16 | Daughter | — | Michigan |
| 56 | Anita Mudarczak | 13 | Daughter | — | Michigan |
| 57 | Doloris Mudarczak | 12 | Daughter | — | Michigan |
| 58 | Lorain Mudarczak | 10 | Daughter | — | Michigan |
| 59 | Florian Bierzinski | 34 | Head | Machine Operator | Michigan |
| 60 | Gertrude Bierzinski | 31 | Wife | — | Michigan |
| 61 | Margaret Bierzinski | 2 | Daughter | — | Michigan |
| 62 | Michael Mrozinski | 39 | Head | Machinist | Michigan |
| 63 | Helen Mrozinski | 32 | Wife | — | Michigan |
| 64 | Edward Mrozinski | 14 | Son | — | Michigan |
| 65 | Ritchie Mrozinski | 12 | Daughter | — | Michigan |
| 66 | Bernice Mrozinski | 11 | Daughter | — | Michigan |
| 67 | Gerald Mrozinski | 8 | Son | — | Michigan |
| 68 | Raymond Mrozinski | 6 | Son | — | Michigan |
| 69 | Romaine Mrozinski | 4 | Daughter | — | Michigan |
| 70 | Donald Mrozinski | 2 | Son | — | Michigan |
| 71 | Anthony Krayek | 76 | Head | — | Poland |
| 72 | Gladys Krayek | 40 | Daughter | — | Michigan |
| 73 | Stanley Duchowich | 41 | Head | Dress Maker | Michigan |
| 74 | Angeline Duchowich | 40 | Wife | Moulder | Michigan |
| 75 | Thad Dut | 44 | Head | Auto | Michigan |
| 76 | Jeanette Dut | 38 | Wife | — | Michigan |
| 77 | Frank Kowalski THIS PERSON | 48 | Head | Clerk | Michigan |
| 78 | Angeline Kowalski | 42 | Wife | — | Michigan |
| 79 | Alice Kowalski | 19 | Daughter | Operator | Michigan |
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)