JK
John Knapp — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cambria-County, Pennsylvania
Our Model Tree links this John Knapp across the 1930 and 1940 US Censuses in Cambria-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1930), then head of a 7-person household.
Age 10
b. ~1930
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cambria-County, Pennsylvania |
| Surname | Knapp |
| Given Name | John Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Lilly |
| 1935 Residence (County) | Cambria |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Cresson Shaft |
| Est. Birth Year | ~1930 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Joan Knapp | Daughter | — | 12 | ~1928 |
| Victor Knapp | Son | — | 8 | ~1932 |
| Sophie Knapp | Spouse | — | 32 | ~1908 |
| Edward Knapp | Son | — | 4 | ~1936 |
| John Knapp | Head | — | 36 | ~1904 |
| Barbara Knapp | Daughter | — | 1 | ~1939 |
| John Knapp | Son | — | 10 | ~1930 |
Census Appearances
1930
Cambria, Pennsylvania
Son, age
Cambria, Pennsylvania · implied b. ~1930 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Austria-Czech |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Cambria-County, Pennsylvania
Son, age 10
Cambria-County, Pennsylvania · implied b. ~1930 — 7 household members
| Surname | Knapp |
| Given Name | John Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Lilly |
| 1935 Residence (County) | Cambria |
| Income (1939) | 0 |
| Highest Grade | No 4 |
| 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 Knapp across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Knapp
Son · 1940 · age 10 · b. ~1930 · Pennsylvania
★ You are viewing this record
Sibling
Joan Knapp
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Victor Knapp
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Knapp
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Barbara Knapp
Sibling · 1940 · age 1
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 — Cambria-County, Pennsylvania
Open full size
1940 US Federal Census — Cambria-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03452-00232)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Clara D Hunta | 63 | Head | — | Pennsylvania |
| 42 | Helen Hunta | 30 | Daughter | Farmer | Pennsylvania |
| 43 | Sylvester Hunta | 29 | Son | Dairy Man | Pennsylvania |
| 44 | Alfred Hunta | 27 | Son | — | Pennsylvania |
| 45 | Lambert Hunta | 20 | Son | — | Pennsylvania |
| 46 | W. H. Harber | 61 | Head | — | Pennsylvania |
| 47 | Gertrude Harber | 58 | Wife | — | Pennsylvania |
| 48 | Doris Harber | 26 | Daughter | Clerk | Pennsylvania |
| 49 | Joseph Harber | 20 | Son | Laborer | Pennsylvania |
| 50 | Leo Dennis | 41 | Head | Miner | Pennsylvania |
| 51 | Laura Dennis | 49 | Wife | — | Pennsylvania |
| 52 | Clyde Cooper | 26 | Lodger | Miner | Pennsylvania |
| 53 | Joe Vengloss | 50 | Head | Miner | Poland |
| 54 | Julia Vengloss | 48 | Wife | — | Poland |
| 55 | John Vengloss | 18 | Son | New Worker | Pennsylvania |
| 56 | Mary Vengloss | 16 | Daughter | — | Pennsylvania |
| 57 | Edward Vengloss | 14 | Son | — | Pennsylvania |
| 58 | Blanche Vengloss | 12 | Daughter | — | Pennsylvania |
| 59 | Nellie Vengloss | 10 | Daughter | — | Pennsylvania |
| 60 | Dorothy Vengloss | 8 | Daughter | — | Pennsylvania |
| 61 | Rose M Vengloss | 2 | Daughter | — | Pennsylvania |
| 62 | Annie Vengloss | 77 | Mother | — | Poland |
| 63 | John Knapp | 36 | Head | Miner | Pennsylvania |
| 64 | Sophie Knapp | 32 | Wife | — | Pennsylvania |
| 65 | Joan Knapp | 12 | Daughter | — | Pennsylvania |
| 66 | John Jr Knapp THIS PERSON | 10 | Son | — | Pennsylvania |
| 67 | Victor Knapp | 8 | Son | — | Pennsylvania |
| 68 | Edward Knapp | 4 | Son | — | Pennsylvania |
| 69 | Barbara Knapp | 1 | Daughter | — | Pennsylvania |
| 70 | Edwin West | 45 | Head | Miner | Pennsylvania |
| 71 | Nellie West | 40 | Wife | — | Pennsylvania |
| 72 | Hilda West | 16 | Daughter | — | Pennsylvania |
| 73 | Clarence West | 23 | Son | Miner | Pennsylvania |
| 74 | Anna M West | 22 | Daughter | — | Pennsylvania |
| 75 | Shirley West | 3 | Granddaughter | — | Pennsylvania |
| 76 | Nancy West | 3 | Granddaughter | — | Pennsylvania |
| 77 | Ronald West | 1 | Grandson | — | Pennsylvania |
| 78 | Julia Marako | 60 | Head | — | Poland |
| 79 | Michael Marako | 25 | Son | Miner | Pennsylvania |
| 80 | Julia Marako | 20 | Daughter | New Worker | 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)