MK
Mary Keller — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Mercer-County, New Jersey
Our Model Tree links this Mary Keller across the 1920, 1930 and 1940 US Censuses in Mercer-County, New Jersey (XGBoost, ~Confirmed) — first a spouse (b.~1897), then head of a 6-person household.
Age 43
b. ~1897
Female
Spouse
Born: Hungary
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Mercer-County, New Jersey |
| Surname | Keller |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Hungary |
| 1935 Residence (City) | West Windsor Township |
| 1935 Residence (County) | Mercer |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Roller |
| Industry | Cigar Factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 700 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
| Occupation | Roller |
| Township / Ward | West Windsor Township |
| Est. Birth Year | ~1897 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Catherine Keller | Daughter | — | 16 | ~1924 |
| John Keller | Head | — | 47 | ~1893 |
| Stephen Keller | Other | — | 24 | ~1916 |
| Catherine Keller | Other | — | 70 | ~1870 |
| John Keller | Son | — | 12 | ~1928 |
| Mary Keller | Spouse | — | 43 | ~1897 |
Census Appearances
1920
Mercer, New …
Other, age 22
Mercer, New Jersey · implied b. ~1898 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Keller |
| Given Name | Mary |
| Relationship to Head | Daughter-in-law |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Married |
| Birthplace | Hungary |
| Naturalization Status | Un |
| Father's Birthplace | Hungary |
| Mother's Birthplace | Hungary |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
1930
Mercer, New …
Spouse, age 34
Mercer, New Jersey · implied b. ~1896 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Celler |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Hungary |
| Naturalization Status | Alien |
| Year of Immigration | 1921 |
| Age at First Marriage | 22 |
| Father's Birthplace | Hungary |
| Mother's Birthplace | Hungary |
| Can Read/Write | Yes |
| Mother Tongue | Hungarian |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
1940
Mercer-County, New …
Spouse, age 43
Mercer-County, New Jersey · implied b. ~1897 — 6 household members
| Surname | Keller |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Hungary |
| 1935 Residence (City) | West Windsor Township |
| 1935 Residence (County) | Mercer |
| Naturalization Status | Naturalized |
| Occupation | Roller |
| Industry | Cigar Factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 700 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth Country | Hungary |
| Birthplace (normalized) | hungary |
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 Keller 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 Keller
Spouse · 1940 · age 43 · b. ~1897 · New Jersey
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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 — Mercer-County, New Jersey
Open full size
1940 US Federal Census — Mercer-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02357-00867)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Alois Rothkamp | 36 | Head | Farmer | New York |
| 2 | Catherine Rothkamp | 36 | Wife | — | New York |
| 3 | Ruth Rothkamp | 11 | Daughter | — | New York |
| 4 | Alice Rothkamp | 7 | Daughter | — | New York |
| 5 | Ronald Rothkamp | 3 | Son | — | New York |
| 6 | Hiram S. Mount | 72 | Head | — | New Jersey |
| 7 | Vera Mount | 45 | Wife | — | Pennsylvania |
| 8 | Newton S. Mount | 11 | Son | — | New Jersey |
| 9 | Victor Mount | 3 | Son | — | New Jersey |
| 10 | Sarah S. Gerrity | 16 | Daughter | — | Pennsylvania |
| 11 | Kalman Hodossy | 51 | Head | Farmer | Hungary |
| 12 | Gasparina Hodossy | 51 | Wife | — | Hungary |
| 13 | Kalman Jr. Hodossy | 28 | Son | Helper | New Jersey |
| 14 | Elizabeth Hodossy | 26 | Daughter | Roller | New Jersey |
| 15 | Frank D. Tyrell | 52 | Head | Farmer | New Jersey |
| 16 | Loretta A. Tyrell | 52 | Wife | Supervisor | New Jersey |
| 17 | Bond J. Tyrell | 41 | Brother | Helper | New Jersey |
| 18 | James Neff | 19 | Lodger | Laborer | North Carolina |
| 19 | George Sherman | 31 | Head | Truck Driver | New Jersey |
| 20 | Stella A. Sherman | 29 | Wife | Farmer | New Jersey |
| 21 | Joyce Sherman | 7 | Daughter | — | New Jersey |
| 22 | Marie Sherman | 3 | Daughter | — | New Jersey |
| 23 | Sylvester Sherman | 56 | Head | Farmer | New Jersey |
| 24 | Florence W. Sherman | 53 | Wife | — | New Jersey |
| 25 | Lloyd V. Pullen | 26 | Lodger | — | New Jersey |
| 26 | Anna W. Pullen | 76 | Mother | — | New Jersey |
| 27 | Charles Allen | 24 | Head | Laborer | New Jersey |
| 28 | Nellie Allen | 21 | Wife | — | New Jersey |
| 29 | John Keller | 47 | Head | Farmer | Hungary |
| 30 | Mary Keller THIS PERSON | 43 | Wife | Roller | Hungary |
| 31 | Catherine Keller | 16 | Daughter | — | New Jersey |
| 32 | John Jr. Keller | 12 | Son | — | New Jersey |
| 33 | Stephen Keller | 24 | Lodger | — | Hungary |
| 34 | Catherine Keller | 70 | Mother | — | Hungary |
| 35 | Anna W. Smith | 63 | Head | — | New Jersey |
| 36 | Elmer H. Vans | 38 | Head | Farmer | New Jersey |
| 37 | Elsie Vans | 34 | Wife | — | New Jersey |
| 38 | Virginia Vans | 11 | Daughter | — | New Jersey |
| 39 | Harvey D. Pullen | 61 | Head | Farmer | New Jersey |
| 40 | Ada Pullen | 57 | Wife | Houseworker | New Jersey |
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)