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John Koch — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Lehigh-County, Pennsylvania
Our Model Tree links this John Koch across the 1920, 1930 and 1940 US Censuses in Lehigh-County, Pennsylvania (XGBoost, ~Confirmed) — first a head (b.~1883), then head of a 4-person household.
Age 57
b. ~1883
Male
Head
Born: New Jersey
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Lehigh-County, Pennsylvania |
| Surname | Koch, |
| Given Name | John F. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Upper Milford Township |
| 1935 Residence (County) | Lehigh |
| Additional Details | |
| Occupation | Mail Operator |
| Industry | Wire Mill |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 476 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Occupation | Mail Operator |
| Township / Ward | Upper Milford Township |
| Est. Birth Year | ~1883 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Earl Koch | Son | — | 22 | ~1918 |
| John Koch | Head | — | 57 | ~1883 |
| Marie Koch | Daughter | — | 19 | ~1921 |
| Ella Koch | Spouse | — | 57 | ~1883 |
Census Appearances
1920
Lehigh, Pennsylvania
Head, age 34
Lehigh, Pennsylvania · implied b. ~1886 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | John F |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | New Jersey |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Mechanic |
| Industry | Auto Works |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Lehigh, Pennsylvania
Head, age 45
Lehigh, Pennsylvania · implied b. ~1885 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | John F. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | New Jersey |
| Age at First Marriage | 23 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Nail-maker |
| Industry | Wire-mill |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | 6500 |
| Veteran | O |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Lehigh-County, Pennsylvania
Head, age 57
Lehigh-County, Pennsylvania · implied b. ~1883 — 4 household members
| Surname | Koch, |
| Given Name | John F. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Upper Milford Township |
| 1935 Residence (County) | Lehigh |
| Occupation | Mail Operator |
| Industry | Wire Mill |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 476 |
| Highest Grade | No 4 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 Koch across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Koch
Head · 1940 · age 57 · b. ~1883 · 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 — Lehigh-County, Pennsylvania
Open full size
1940 US Federal Census — Lehigh-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03548-00124)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ida A. Rothenberger | 65 | Wife | — | Pennsylvania |
| 2 | Paul P. Rothenberger | 32 | Son | Helper | Pennsylvania |
| 3 | Mary E. Rothenberger | 26 | Daughter | — | Pennsylvania |
| 4 | Helen E. Rothenberger | 25 | Daughter | — | Pennsylvania |
| 5 | Mary A. Heintzelman | 71 | Head | — | Pennsylvania |
| 6 | Percy Gruber, | 40 | Head | Farmer | Pennsylvania |
| 7 | Helen K. Gruber, | 42 | Wife | — | Pennsylvania |
| 8 | John Christman | 17 | Hired Hand | Helper | Pennsylvania |
| 9 | John F. Koch, THIS PERSON | 57 | Head | Mail Operator | New Jersey |
| 10 | Ella B. Koch, | 57 | Wife | — | Pennsylvania |
| 11 | Earl W. Koch, | 22 | Son | Laborer | Pennsylvania |
| 12 | Marie E. Koch, | 19 | Daughter | Operator | Pennsylvania |
| 13 | Victor Sadorvitz | 43 | Head | Laborer | Austria-Hungary |
| 14 | Angela Sadorvitz | 48 | Wife | — | Austria-Hungary |
| 15 | William Sadorvitz | 24 | Son | Laborer | Pennsylvania |
| 16 | Albert L. Sadorvitz | 19 | Son | Truck Driver | Pennsylvania |
| 17 | Frank L. Sadorvitz | 11 | Son | — | Pennsylvania |
| 18 | Walter Sadorvitz | 14 | Son | — | Pennsylvania |
| 19 | Joseph Sadorvitz | 8 | Son | — | Pennsylvania |
| 20 | Hiram M. Hillegass | 46 | Head | Laborer | Pennsylvania |
| 21 | Louise M. Hillegass | 40 | Wife | — | Pennsylvania |
| 22 | Leroy J. Hillegass | 20 | Son | Press Framer | Pennsylvania |
| 23 | Viola B. Hillegass | 16 | Daughter | Operator | Pennsylvania |
| 24 | Eva R. Hillegass | 13 | Daughter | — | Pennsylvania |
| 25 | Ray L. Hillegass | 10 | Son | — | Pennsylvania |
| 26 | Warren A. Hillegass | 5 | Son | — | Pennsylvania |
| 27 | Norman L. Hillegass | 6 | Son | — | Pennsylvania |
| 28 | Ionella L. Hillegass | 4 | Daughter | — | Pennsylvania |
| 29 | Harold F. Hillegass | 1 | Son | — | Pennsylvania |
| 30 | Albert C. Diehl, | 34 | Head | Laborer | Pennsylvania |
| 31 | Clara M. Diehl, | 29 | Wife | Operator | Pennsylvania |
| 32 | Donald L. Diehl, | 8 | Son | — | Pennsylvania |
| 33 | John Entler, | 50 | Head | Laborer | Austria |
| 34 | Anna Entler, | 48 | Wife | Operator | Austria |
| 35 | Charles Entler, | 22 | Son | Laborer | Pennsylvania |
| 36 | Helen Entler, | 20 | Daughter | Operator | Pennsylvania |
| 37 | Emily Entler, | 6 | Daughter | — | Pennsylvania |
| 38 | Clayton L. B. Kemmerer | 56 | Head | Farmer | Pennsylvania |
| 39 | Sallie A. Kemmerer | 56 | Wife | — | Pennsylvania |
| 40 | Albert W. Kemmerer | 19 | Son | Dishwasher | 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)