JF
John Frederick — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Montgomery-County, Pennsylvania
Our Model Tree links this John Frederick across the 1930 and 1940 US Censuses in Montgomery-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1924), then head of a 8-person household.
Age 16
b. ~1924
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Montgomery-County, Pennsylvania |
| Surname | Frederick |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Conshohocken |
| 1935 Residence (County) | Montgomery |
| Additional Details | |
| Highest Grade | 9 |
| 1935 Residence | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Spring Mill |
| Est. Birth Year | ~1924 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Frederick | Son | — | 16 | ~1924 |
| Theresa Frederick | Daughter | — | 9 | ~1931 |
| Agnes Frederick | Daughter | — | 21 | ~1919 |
| Julia Frederick | Spouse | — | 43 | ~1897 |
| Rose Frederick | Daughter | — | 14 | ~1926 |
| William Frederick | Son | — | 20 | ~1920 |
| James Frederick | Son | — | 12 | ~1928 |
| Basil Frederick | Head | — | 47 | ~1893 |
Census Appearances
1930
Chester, Pennsylvania
Son, age 6
Chester, Pennsylvania · implied b. ~1924 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederick |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Italy |
| Mother's Birthplace | Italy |
| Can Read/Write | No |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Montgomery-County, Pennsylvania
Son, age 16
Montgomery-County, Pennsylvania · implied b. ~1924 — 8 household members
| Surname | Frederick |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Conshohocken |
| 1935 Residence (County) | Montgomery |
| Highest Grade | 9 |
| 1935 Residence | Pennsylvania |
| 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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Frederick
Son · 1940 · age 16 · b. ~1924 · Pennsylvania
★ You are viewing this record
Sibling
Agnes Frederick
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Theresa Frederick
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Frederick
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rose Frederick
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Frederick
Sibling · 1940 · age 20
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 — Montgomery-County, Pennsylvania
Open full size
1940 US Federal Census — Montgomery-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03586-00333)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Joseph J. Jr. Mullen | 29 | Son | Collector | Pennsylvania |
| 42 | John J. Mullen | 26 | Son | Laborer | Pennsylvania |
| 43 | Mary V. Mullen | 62 | Sister | — | Pennsylvania |
| 44 | Robert P. Gluzinger | 26 | Head | Laborer | Pennsylvania |
| 45 | Margaret M. Gluzinger | 27 | Wife | — | Pennsylvania |
| 46 | Margaret J. Gluzinger | 3 | Daughter | — | Pennsylvania |
| 47 | John Frederick | 35 | Head | Truck Driver | Pennsylvania |
| 48 | Verna M. Frederick | 34 | Wife | — | New Jersey |
| 49 | Marie F. Frederick | 17 | Daughter | — | New Jersey |
| 50 | Eva Ward | 64 | Mother | — | New Jersey |
| 51 | Basil Frederick | 47 | Head | Mechanic | Pennsylvania |
| 52 | Julia Frederick | 43 | Wife | — | Pennsylvania |
| 53 | William Frederick | 20 | Son | Mechanic | Pennsylvania |
| 54 | Agnes Frederick | 21 | Daughter | Operator | Pennsylvania |
| 55 | John Frederick THIS PERSON | 16 | Son | — | Pennsylvania |
| 56 | Rose Frederick | 14 | Daughter | — | Pennsylvania |
| 57 | James Frederick | 12 | Son | — | Pennsylvania |
| 58 | Theresa Frederick | 9 | Daughter | — | Pennsylvania |
| 59 | Otto H. Fleising | 48 | Head | Tire Maker | Germany |
| 60 | Anna J. Fleising | 48 | Wife | — | New York |
| 61 | Otto H. Jr. Fleising | 18 | Son | — | New Jersey |
| 62 | Jeremiah J. Freas | 25 | Head | Wire Maker | Pennsylvania |
| 63 | Rita M. Freas | 24 | Wife | — | Pennsylvania |
| 64 | Jeremiah J. Jr. Freas | 2 | Son | — | Pennsylvania |
| 65 | Winfield Crawford | 35 | Head | Shipping Clerk | Pennsylvania |
| 66 | Dorothy T. Crawford | 25 | Wife | — | Pennsylvania |
| 67 | Dorothy J. Crawford | 4 | Daughter | — | Pennsylvania |
| 68 | Janet S. Crawford | 3 | Daughter | — | Pennsylvania |
| 69 | Emma R. Blackburn | 55 | Head | — | Pennsylvania |
| 70 | Walter C. Blackburn | 26 | Son | Steel Mill | Pennsylvania |
| 71 | Virginia E. Blackburn | 26 | Daughter | — | Pennsylvania |
| 72 | Walter W. Blackburn | 1 | Grandson | — | Pennsylvania |
| 73 | Raymond J. Stateler | 42 | Brother | Machine Shop | Pennsylvania |
| 74 | Margaret W. Blackburn | 58 | Daughter-in-law | Drug Company | Pennsylvania |
| 75 | Thomas H. Ramsey | 68 | Head | Steel Mill | Pennsylvania |
| 76 | Ella B. Ramsey | 69 | Wife | — | Pennsylvania |
| 77 | Albert Melchiore | 32 | Head | Clerk | Italy |
| 78 | Marie G. Melchiore | 30 | Wife | — | Pennsylvania |
| 79 | Albert J. Jr. Melchiore | 8 | Son | — | Pennsylvania |
| 80 | Barbara Lee Melchiore | 12 | Daughter | — | 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)