JF
John Frederick — 1940 US Census Record
Model Tree available1940 United States Federal Census · Lehigh-County, Pennsylvania
Our Model Tree links this John Frederick across the 1920, 1930 and 1940 US Censuses in Lehigh-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1907), then head of a 6-person household.
Age 33
b. ~1907
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lehigh-County, Pennsylvania |
| Surname | Frederick |
| Given Name | John L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Upper Milford Township |
| 1935 Residence (County) | Lehigh |
| Additional Details | |
| Occupation | Helper |
| Industry | Father's Farm |
| Class of Worker | NP |
| Hours Worked | 54 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Helper |
| Township / Ward | Upper Milford Township |
| Est. Birth Year | ~1907 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| John Frederick | Son | — | 33 | ~1907 |
| John Frederick | Head | — | 55 | ~1885 |
| Earl Frederick | Son | — | 22 | ~1918 |
| Betty Frederick | Daughter | — | 16 | ~1924 |
| Annie Frederick | Spouse | — | 55 | ~1885 |
| Lorraine Frederick | Daughter | — | 18 | ~1922 |
Census Appearances
1920
Lehigh, Pennsylvania
Son, age 13
Lehigh, Pennsylvania · implied b. ~1907 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederick |
| Given Name | John F |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Lehigh, Pennsylvania
Son, age 23
Lehigh, Pennsylvania · implied b. ~1907 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederick |
| Given Name | John L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Age at First Marriage | W |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | VVVV |
| Can Read/Write | Yes |
| Home Owned/Rented | No |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Lehigh-County, Pennsylvania
Son, age 33
Lehigh-County, Pennsylvania · implied b. ~1907 — 6 household members
| Surname | Frederick |
| Given Name | John L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Upper Milford Township |
| 1935 Residence (County) | Lehigh |
| Occupation | Helper |
| Industry | Father's Farm |
| Class of Worker | NP |
| Hours Worked | 54 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| 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 Frederick across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Frederick (~0.92 confidence) and father John Frederick (~0.92 confidence) and father S Frederick (~0.92 confidence) and mother Annie Frederick (~0.92 confidence) and mother Annie Frederick (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Frederick
b. ~1877
Source father
● Household
· direct · ~0.92
Father
John Frederick
b. ~1885
Source father
● Household
· direct · ~0.92
Father
S Frederick
b. ~1877
Source father
● Household
· direct · ~0.92
Mother
Annie Frederick
b. ~1882
Source mother
● Household
· direct · ~0.92
Mother
Annie Frederick
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Frederick
Son · 1940 · age 33 · b. ~1907 · Pennsylvania
★ You are viewing this record
Sibling
Betty Frederick
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Earl Frederick
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lorraine Frederick
Sibling · 1940 · age 18
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
40 people indexed on this census page (nara:1940:m-t0627-03548-00137)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Cora E. Wreord | 64 | Sister | — | Pennsylvania |
| 42 | James M. Simpson | 44 | Head | Accountant | Pennsylvania |
| 43 | Anna A. Howard | 65 | Housekeeper | Housework | Pennsylvania |
| 44 | Irwin W. Laird | 64 | Boarder | Barber | Pennsylvania |
| 45 | Raymond Yochum | 37 | Head | Farmer | Pennsylvania |
| 46 | Esther E. Yochum | 35 | Wife | — | Pennsylvania |
| 47 | Raymond Jr. Yochum | 15 | Son | Helper | Pennsylvania |
| 48 | Walter M. Yochum | 13 | Son | — | Pennsylvania |
| 49 | Elaine M. G. Yochum | 10 | Daughter | — | Pennsylvania |
| 50 | Gladys F. Yochum | 9 | Daughter | — | Pennsylvania |
| 51 | Delores C. Yochum | 4 | Daughter | — | Pennsylvania |
| 52 | Robert J. Ruff | 53 | Head | Truck Driver | Pennsylvania |
| 53 | Emma H. Ruff | 45 | Wife | — | Pennsylvania |
| 54 | Paul M. Ruff | 6 | Son | — | Pennsylvania |
| 55 | Charles H. Moyer | 45 | Son | Millwright | Pennsylvania |
| 56 | Adelaide L. Moyer | 30 | Daughter | — | Pennsylvania |
| 57 | Arthur W. Welsis | 45 | Head | Laborer | Pennsylvania |
| 58 | Arthur W. Jr. Welsis | 12 | Son | — | Pennsylvania |
| 59 | Earl A. Welsis | 4 | Son | — | Pennsylvania |
| 60 | Calvin E. Stout | 37 | Head | Locomotive Engineer | Pennsylvania |
| 61 | Edna V. Stout | 33 | Wife | — | Pennsylvania |
| 62 | Gloria A. Stout | 11 | Daughter | — | Pennsylvania |
| 63 | Joan M. Stout | 9 | Daughter | — | Pennsylvania |
| 64 | Patricia L. Stout | 2 | Daughter | — | Pennsylvania |
| 65 | William B. Moll | 33 | Head | Laborer | Pennsylvania |
| 66 | Helen M. Moll | 31 | Wife | — | Pennsylvania |
| 67 | Betty A. Moll | 13 | Daughter | — | Pennsylvania |
| 68 | Reda M. Moll | 9 | Daughter | — | Pennsylvania |
| 69 | Sharlene S. Moll | 4 | Daughter | — | Pennsylvania |
| 70 | Lester L. Amig | 30 | Head | Laborer | Pennsylvania |
| 71 | Mildred M. Amig | 25 | Wife | — | Pennsylvania |
| 72 | Betty May M. Amig | 8 | Daughter | — | Pennsylvania |
| 73 | Shirley M. Amig | 5 | Daughter | — | Pennsylvania |
| 74 | John S. Frederick | 55 | Head | Farmer | Pennsylvania |
| 75 | Annie E. C. Frederick | 55 | Wife | — | Pennsylvania |
| 76 | John L. Frederick THIS PERSON | 33 | Son | Helper | Pennsylvania |
| 77 | Earl C. Frederick | 22 | Son | Helper | Pennsylvania |
| 78 | Lorraine L. Frederick | 18 | Daughter | — | Pennsylvania |
| 79 | Betty Frederick | 16 | Daughter | — | Pennsylvania |
| 80 | Paul J. Freylach | 32 | Head | Flesher | Pennsylvania |
Pedigree Summary
John + 3 siblings
Gen 1 · 5 parents
~0.92
Max depth 4 (1900–1950 window)
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)