JK
John Knapp — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Warren, Pennsylvania
Our Model Tree links this John Knapp across the 1930 and 1940 US Censuses in Warren, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1917), then head of a 6-person household.
Age 13
b. ~1917
Male
Son
Born: Pennsylvania
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Warren, Pennsylvania |
| Surname | Knapp |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Youngsville Borough |
| Est. Birth Year | ~1917 |
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 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Barbara Knapp | Daughter | — | 4 | ~1926 |
| Carolyn Knapp | Daughter | — | 11 | ~1919 |
| John Knapp | Son | — | 13 | ~1917 |
| Ralph Knapp | Head | — | 46 | ~1884 |
| Margaret Knapp | Other | — | 43 | ~1887 |
| Robert Knapp | Son | — | 8 | ~1922 |
Census Appearances
1930
Warren, Pennsylvania
Son, age 13
Warren, Pennsylvania · implied b. ~1917 — 6 household members
| Surname | Knapp |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Warren-County, Pennsylvania
Head, age 25
Warren-County, Pennsylvania · implied b. ~1915 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knupp |
| Given Name | John C. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Russell |
| 1935 Residence (County) | Warren |
| Occupation | dove-tailer |
| Industry | furniture factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1117 |
| Highest Grade | H-4 |
| 1935 Residence | Penna |
| 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 · 1930 · age 13 · b. ~1917 · Pennsylvania
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Sibling
Robert Knapp
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Barbara Knapp
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Carolyn Knapp
Sibling · 1930 · age 11
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
1930 US Federal Census — Warren, Pennsylvania
Open full size
1930 US Federal Census — Warren, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1930:fifteenthcensus00reel2154:0341)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Carl N. Miller | 32 | Son | Retail Merchant | Pennsylvania |
| 52 | Bernice D. Miller | 6 | Gr-Daughter | — | Pennsylvania |
| 53 | Joyce J. Miller | 4 | Gr-Daughter | — | Pennsylvania |
| 54 | Arthur R. Mead | 46 | Head | Mechanic | New York |
| 55 | Inis Mead | 47 | Wife-H | — | New York |
| 56 | Peter C. Miller | 55 | Head | Mechanic | Denmark |
| 57 | Clara A. Slater | 46 | Head | Assistant Cashier | Pennsylvania |
| 58 | Mary A. Slater | 48 | Sister-H | — | Pennsylvania |
| 59 | Sarah M. Cash | 70 | Aunt | — | Pennsylvania |
| 60 | Alfred C. Hazeltine | 35 | Head | Laborer | Pennsylvania |
| 61 | Loretta M. Hazeltine | 25 | Wife-H | — | Pennsylvania |
| 62 | Leroy A. Hazeltine | 5 | Son | — | Pennsylvania |
| 63 | Alfred E. Hazeltine | 2 | Son | — | Pennsylvania |
| 64 | Claude E. Moody | 48 | Head | Retail Merchant | New York |
| 65 | Virginia E. Moody | 11 | Niece | — | Pennsylvania |
| 66 | George S. Tanchuk | 32 | Head | Laborer | Austria |
| 67 | Amy H. Tanchuk | 14 | Wife-H | — | Canada-English |
| 68 | Peter G. Tanchuk | 1 | Son | — | Pennsylvania |
| 69 | Carrie M. Knapp | 71 | Head-H | — | Pennsylvania |
| 70 | Nelly G. Knapp | 47 | Daughter | Manuscripting | Pennsylvania |
| 71 | Ralph H. Knapp | 46 | Head | Doctor | Pennsylvania |
| 72 | Margaret S. Knapp | 43 | Wife-H | — | Massachusetts |
| 73 | John S. Knapp THIS PERSON | 13 | Son | — | Pennsylvania |
| 74 | Carolyn E. Knapp | 11 | Daughter | — | Pennsylvania |
| 75 | Robert C. Knapp | 8 | Son | — | Pennsylvania |
| 76 | Barbara Knapp | 4 | Daughter | — | Pennsylvania |
| 77 | Edward S. Martindale | 63 | Head | — | Pennsylvania |
| 78 | Nellie M. Martindale | 54 | Wife-H | — | Pennsylvania |
| 79 | James F. Troup | 28 | Son-in-law | Salesman | Pennsylvania |
| 80 | Bernice A. Troup | 23 | Daughter | — | Pennsylvania |
| 81 | Moses Olds | 50 | Head | Painter | Pennsylvania |
| 82 | Maud Olds | 48 | Wife-H | — | Pennsylvania |
| 83 | Mildred M. Graham | 17 | Daughter | — | Pennsylvania |
| 84 | Pearl M. Graham | 1 | Gr-Daughter | — | Pennsylvania |
| 85 | Melville S. Whitney | 80 | Head | — | Pennsylvania |
| 86 | Florence D. Whitney | 81 | Wife-H | — | Pennsylvania |
| 87 | John L. Weldon | 65 | Head | Lumberman | Pennsylvania |
| 88 | Mae D. Weldon | 55 | Wife-H | — | Pennsylvania |
| 89 | Donald M. Weldon | 34 | Son | Lumberman | Pennsylvania |
| 90 | Katherine M. Weldon | 18 | Daughter | — | Pennsylvania |
| 91 | Charles J. Mead | 66 | Head | — | Pennsylvania |
| 92 | Mattie B. Mead | 59 | Wife-H | — | Pennsylvania |
| 93 | Grant H. Chipman | 65 | Head | Foreman | Pennsylvania |
| 94 | Bertha H. Chipman | 53 | Wife-H | — | Pennsylvania |
| 95 | Florine M. Jacobs | 78 | Sister | — | Pennsylvania |
| 96 | Cora L. Johnson | 45 | Head | — | Pennsylvania |
| 97 | Elaine M. Johnson | 16 | Daughter | — | Pennsylvania |
| 98 | Thomas M. Johnson | 14 | Son | — | Pennsylvania |
| 99 | Erwin G. Johnson | 11 | Son | — | Pennsylvania |
| 100 | Allan E. Johnson | 22 | Head | Foreman | Pennsylvania |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)