MK
Mary Kozlowski — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Susquehanna-County, Pennsylvania
Our Model Tree links this Mary Kozlowski across the 1930 and 1940 US Censuses in Susquehanna-County, Pennsylvania (XGBoost, ~Confirmed) — first a spouse (b.~1885), then head of a 5-person household.
Age 55
b. ~1885
Female
Spouse
Born: Poland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Susquehanna-County, Pennsylvania |
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Harford |
| 1935 Residence (County) | Susquehanna |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | No 2 |
| 1935 Residence | Same place |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
| Township / Ward | Harford |
| Est. Birth Year | ~1885 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Martin Kozlowski | Son | — | 12 | ~1928 |
| Mary Kozlowski | Spouse | — | 55 | ~1885 |
| Nelson Kozlowski | Son | — | 19 | ~1921 |
| Raymond Kozlowski | Son | — | 14 | ~1926 |
| Martin Kozlowski | Head | — | 57 | ~1883 |
Census Appearances
1930
Susquehanna, Pennsylvania
Other, age 44
Susquehanna, Pennsylvania · implied b. ~1886 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kozlowsky |
| Given Name | Mary A. |
| Relationship to Head | wife-H |
| Sex | F |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Poland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1901 |
| Age at First Marriage | 20 |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | none |
| Can Read/Write | No |
| Mother Tongue | Polish |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
1940
Susquehanna-County, Pennsylvania
Spouse, age 55
Susquehanna-County, Pennsylvania · implied b. ~1885 — 5 household members
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Harford |
| 1935 Residence (County) | Susquehanna |
| Naturalization Status | Naturalized |
| Highest Grade | No 2 |
| 1935 Residence | Same place |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
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 Kozlowski across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Kozlowski
Spouse · 1940 · age 55 · b. ~1885 · Pennsylvania
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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 — Susquehanna-County, Pennsylvania
Open full size
1940 US Federal Census — Susquehanna-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03613-00470)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Anna H Germak | 10 | Boarder | — | Penna |
| 2 | Clarence R Baker | 26 | Head | Laborer | Penna |
| 3 | Stephen F Forsythe | 38 | Head | Farmer | Penna |
| 4 | Leona M Forsythe | 35 | Wife | — | New York |
| 5 | Gordon J Forsythe | 12 | Son | — | New York |
| 6 | Frank B Hayes | 47 | Head | Farmer | Penna |
| 7 | Mary E Hayes | 38 | Wife | — | Penna |
| 8 | Frances E Hayes | 13 | Daughter | — | Penna |
| 9 | Robert J Hayes | 9 | Son | — | Penna |
| 10 | Clarence S Hayes | 8 | Son | — | Penna |
| 11 | Richard H Hayes | 6 | Son | — | Penna |
| 12 | Ruth D Hayes | 1 | Daughter | — | Penna |
| 13 | Martin Kozlowski | 57 | Head | Farmer | Poland |
| 14 | Mary Kozlowski THIS PERSON | 55 | Wife | — | Poland |
| 15 | Nelson J Kozlowski | 19 | Son | Laborer | Penna |
| 16 | Raymond Kozlowski | 14 | Son | — | Penna |
| 17 | Martin H Kozlowski | 12 | Son | — | Penna |
| 18 | Frank N Steve | 73 | Head | Farmer | New York |
| 19 | Mary A Steve | 80 | Wife | — | Penna |
| 20 | Mary C Engates | 44 | Head | Operator | Penna |
| 21 | Pauline M Engates | 20 | Daughter | — | Penna |
| 22 | Freda L Engates | 14 | Daughter | — | Penna |
| 23 | Leona M Engates | 12 | Daughter | — | Penna |
| 24 | Walter W Parks | 24 | Head | Laborer | Penna |
| 25 | Jessie Parks | 23 | Wife | — | Penna |
| 26 | Clyde B Freeman | 54 | Head | Laborer | Penna |
| 27 | Lucy C Freeman | 65 | Wife | — | Penna |
| 28 | Hardy Horton | 20 | Head | Laborer | Penna |
| 29 | Helen W Horton | 17 | Wife | — | Penna |
| 30 | Shirley M Horton | 0 | Daughter | — | Penna |
| 31 | Jesse E Weber | 31 | Head | Laborer | Penna |
| 32 | Alice F Weber | 21 | Wife | — | Penna |
| 33 | Walter Weber | 1 | Son | — | Penna |
| 34 | Chas A Yeomans | 30 | Boarder | Laborer | Penna |
| 35 | Elmer D Tiffany | 75 | Head | — | Penna |
| 36 | Vina Tiffany | 70 | Wife | — | Penna |
| 37 | Wynn W Tiffany | 42 | Son | Laborer | Penna |
| 38 | George Wilbur | 29 | Head | Truck Driver | Penna |
| 39 | Dorothy Wilbur | 27 | Wife | — | Penna |
| 40 | Donald G Wilbur | 0 | Son | — | Penna |
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)