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William Knapp — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Jefferson-County, Pennsylvania
Our Model Tree links this William Knapp across the 1930 and 1940 US Censuses in Jefferson-County, Pennsylvania (XGBoost, ~Confirmed) — first a head (b.~1909), then head of a 7-person household.
Age 31
b. ~1909
Male
Head
Born: Pennsylvania
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Jefferson-County, Pennsylvania |
| Surname | Knapp |
| Given Name | William B. |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Clover Township |
| 1935 Residence (County) | Jefferson |
| Additional Details | |
| Occupation | laborer |
| Industry | W.P.A. road |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 520 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Laborer |
| Township / Ward | Clover Township |
| Est. Birth Year | ~1909 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Richard Knapp | Son | — | 16 | ~1924 |
| Leona Knapp | Daughter | — | 11 | ~1929 |
| Cleora Knapp | Daughter | — | 5 | ~1935 |
| Burton Knapp | Son | — | 7 | ~1933 |
| Betty Knapp | Daughter | — | 9 | ~1931 |
| Gladys Knapp | Spouse | — | 34 | ~1906 |
| William Knapp | Head | — | 31 | ~1909 |
Census Appearances
1930
Jefferson, Pennsylvania
Head, age 20
Jefferson, Pennsylvania · implied b. ~1910 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Age at First Marriage | 18 |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Miner |
| Industry | Coal Mine |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 6 |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Jefferson-County, Pennsylvania
Head, age 31
Jefferson-County, Pennsylvania · implied b. ~1909 — 7 household members
| Surname | Knapp |
| Given Name | William B. |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Clover Township |
| 1935 Residence (County) | Jefferson |
| Occupation | laborer |
| Industry | W.P.A. road |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 520 |
| Highest Grade | No 7 |
| 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 William Knapp across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
William Knapp
Head · 1940 · age 31 · b. ~1909 · 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 — Jefferson-County, Pennsylvania
Open full size
1940 US Federal Census — Jefferson-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03519-00316)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mary E. Mankie | 30 | wife | — | Pennsylvania |
| 42 | Charles Chestnut | 34 | head | Laborer | Pennsylvania |
| 43 | Emma Chestnut | 31 | wife | — | Pennsylvania |
| 44 | Victor L. Kilgore | 61 | head | Laborer | Pennsylvania |
| 45 | William W. Kilgore | 61 | brother | — | Pennsylvania |
| 46 | Leslie Shields | 61 | head | Farmer | Pennsylvania |
| 47 | Myrtle O. Shields | 53 | wife | — | Pennsylvania |
| 48 | John W. Shields | 55 | head | Farmer | Pennsylvania |
| 49 | Lulu M. Shields | 57 | wife | — | Pennsylvania |
| 50 | Benjamin C. Shields | 48 | head | Farmer | Pennsylvania |
| 51 | Martha A. Shields | 66 | sister | — | Pennsylvania |
| 52 | Artie Shields | 55 | sister | — | Pennsylvania |
| 53 | William B. Knapp THIS PERSON | 31 | head | Laborer | Pennsylvania |
| 54 | Gladys O. Knapp | 34 | wife | — | Pennsylvania |
| 55 | Richard Knapp | 16 | son | — | Pennsylvania |
| 56 | Leona Knapp | 11 | daughter | — | Pennsylvania |
| 57 | Betty Knapp | 9 | daughter | — | Pennsylvania |
| 58 | Burton Knapp | 7 | son | — | Pennsylvania |
| 59 | Cleora Knapp | 5 | daughter | — | Pennsylvania |
| 60 | Thompson T. Walmer | 65 | head | Farmer | Pennsylvania |
| 61 | Tirza Walmer | 74 | wife | — | Pennsylvania |
| 62 | Gerald D. Ballantyne | 36 | head | Electrical Worker | Pennsylvania |
| 63 | Lela Ballantyne | 32 | wife | — | Pennsylvania |
| 64 | Gloria Ballantyne | 11 | daughter | — | Pennsylvania |
| 65 | Donald Ballantyne | 9 | son | — | Pennsylvania |
| 66 | Leroy Ballantyne | 2 | son | — | Pennsylvania |
| 67 | William Heckman | 66 | head | — | Pennsylvania |
| 68 | Blair E. Shields | 28 | head | Foreman | Pennsylvania |
| 69 | Helen L. Shields | 23 | wife | — | Pennsylvania |
| 70 | Wade O. Mayo | 32 | head | Laborer | Pennsylvania |
| 71 | Ethel Mayo | 21 | wife | — | Pennsylvania |
| 72 | De Vere Mayo | 10 | son | — | Pennsylvania |
| 73 | Dean Mayo | 8 | son | — | Pennsylvania |
| 74 | Paul Mayo | 5 | son | — | Pennsylvania |
| 75 | Elmer O. Steele | 33 | head | Farmer | Pennsylvania |
| 76 | Elva Steele | 32 | wife | — | Pennsylvania |
| 77 | Ralph Steele | 20 | son | Truck Driver | Pennsylvania |
| 78 | Dick Mayo | 62 | head | Farmer | Pennsylvania |
| 79 | Lina Mayo | 28 | wife | — | Pennsylvania |
| 80 | Lee Mayo | 24 | son | Farmer | 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)