JK
John Keller — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Lehigh-County, Pennsylvania
Our Model Tree links this John Keller across the 1930 and 1940 US Censuses in Lehigh-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1908), then head of a 9-person household.
Age 32
b. ~1908
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lehigh-County, Pennsylvania |
| Surname | Keller |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Emmaus borough |
| 1935 Residence (County) | Lehigh |
| Additional Details | |
| Occupation | Laborer |
| Industry | Pipe Foundry |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 600 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Laborer |
| Township / Ward | Emmaus Borough |
| Est. Birth Year | ~1908 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Anna Keller | Daughter | — | 19 | ~1921 |
| Florence Keller | Daughter | — | 17 | ~1923 |
| Matie Keller | Head | — | 56 | ~1884 |
| Frank Keller | Son | — | 24 | ~1916 |
| John Keller | Son | — | 32 | ~1908 |
| Edward Keller | Son | — | 13 | ~1927 |
| Anthony Keller | Son | — | 15 | ~1925 |
| Paul Keller | Son | — | 20 | ~1920 |
| Anna Keller | Spouse | — | 54 | ~1886 |
Census Appearances
1930
Lehigh, Pennsylvania
Son, age 22
Lehigh, Pennsylvania · implied b. ~1908 — 13 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koller |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Czechoslovakia |
| Mother's Birthplace | Czechoslovakia |
| Occupation | Laborer |
| Industry | Pipe Foundry |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Lehigh-County, Pennsylvania
Son, age 32
Lehigh-County, Pennsylvania · implied b. ~1908 — 9 household members
| Surname | Keller |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Emmaus borough |
| 1935 Residence (County) | Lehigh |
| Occupation | Laborer |
| Industry | Pipe Foundry |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 600 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 John Keller across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Keller
Son · 1940 · age 32 · b. ~1908 · Pennsylvania
★ You are viewing this record
Sibling
Anna Keller
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Keller
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Keller
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Keller
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Florence Keller
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anthony Keller
Sibling · 1940 · age 15
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
1940 US Federal Census — Lehigh-County, Pennsylvania
Open full size
1940 US Federal Census — Lehigh-County, Pennsylvania
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-03546-00408)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mae A. Stephens | 11 | Daughter | — | Pennsylvania |
| 2 | Michael @ Feder-Cho | 72 | Head | Chipper | Hungary |
| 3 | Mary Feder-Cho | 68 | Wife | — | Hungary |
| 4 | Michael Jr. Feder-Cho | 33 | Son | Grinder | Pennsylvania |
| 5 | Matie @ Keller | 56 | Head | Laborer | Slovakia |
| 6 | Anna Keller | 54 | Wife | — | Slovakia |
| 7 | John Keller THIS PERSON | 32 | Son | Laborer | Pennsylvania |
| 8 | Frank Keller | 24 | Son | Sprayer | Pennsylvania |
| 9 | Paul Keller | 20 | Son | Stamper | Pennsylvania |
| 10 | Anna Keller | 19 | Daughter | Button Holer | Pennsylvania |
| 11 | Florence Keller | 17 | Daughter | Operator | Pennsylvania |
| 12 | Anthony Keller | 15 | Son | — | Pennsylvania |
| 13 | Edward Keller | 13 | Son | — | Pennsylvania |
| 14 | John Vart-Jak | 67 | Head | Laborer | Czechoslovakia |
| 15 | Elizabeth Vart-Jak | 66 | Wife | — | Czechoslovakia |
| 16 | Joseph Vart-Jak | 21 | Son | Sprayer | Pennsylvania |
| 17 | Andrew Vart-Jak | 20 | Son | Thread Tagger | Pennsylvania |
| 18 | Joseph Kollar | 28 | Son-in-law | Stereotyper | Pennsylvania |
| 19 | Helen B. Kollar | 25 | Daughter | — | Pennsylvania |
| 20 | Joseph P. Kollar | 3 | Grandson | — | Pennsylvania |
| 21 | Rose Mlynch | 64 | Head | — | Czechoslovakia |
| 22 | John P. Mlynch | 30 | Son | Laborer | Pennsylvania |
| 23 | Mary M. Mlynch | 25 | Daughter-in-law | Centerer | Pennsylvania |
| 24 | Rose Marie Mlynch | 2 | Granddaughter | — | Pennsylvania |
| 25 | Andrew Becher | 58 | Head | Laborer | Czechoslovakia |
| 26 | Elizabeth Becher | 57 | Wife | — | Czechoslovakia |
| 27 | John Becher | 34 | Son | Packer | Pennsylvania |
| 28 | Josephine Becher | 26 | Daughter | Assembler | Pennsylvania |
| 29 | Irene Becher | 23 | Daughter | Packer | Pennsylvania |
| 30 | Andrew Jr. @ Becher | 20 | Son | Shipping Clerk | Pennsylvania |
| 31 | Anthony Becher | 16 | Son | — | Pennsylvania |
| 32 | John Sihorski | 48 | Head | Owner | Poland |
| 33 | Katie Sihorski | 45 | Wife | — | Poland |
| 34 | Joseph Sihorski | 20 | Son | Clerk | Pennsylvania |
| 35 | Sophie Sihorski | 18 | Daughter | Operator | Pennsylvania |
| 36 | Anna Sihorski | 17 | Daughter | — | Pennsylvania |
| 37 | Edward Sihorski | 15 | Son | — | Pennsylvania |
| 38 | Julia Sihorski | 13 | Daughter | — | Pennsylvania |
| 39 | John Jr. Sihorski | 12 | Son | — | Pennsylvania |
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)