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William Knapp — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Mercer-County, New Jersey
Our Model Tree links this William Knapp across the 1930 and 1940 US Censuses in Mercer-County, New Jersey (XGBoost, ~Confirmed) — first a head (b.~1909), then head of a 9-person household.
Age 31
b. ~1909
Male
Head
Born: New Jersey
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Mercer-County, New Jersey |
| Surname | Knapp |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Trenton City |
| 1935 Residence (County) | Mercer |
| Additional Details | |
| Occupation | Dust Presser |
| Industry | Porcelain Wks |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Occupation | Dust Presser |
| Township / Ward | Trenton City |
| 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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Laurel Knapp | Daughter | — | 10 | ~1930 |
| Fred Knapp | Son | — | 8 | ~1932 |
| John Knapp | Son | — | 5 | ~1935 |
| William Knapp | Head | — | 31 | ~1909 |
| William Knapp | Son | — | 13 | ~1927 |
| Jennie Knapp | Spouse | — | 29 | ~1911 |
| Bernard Knapp | Son | — | 11 | ~1929 |
| Richard Knapp | Son | — | 6 | ~1934 |
| Ellen Knapp | Daughter | — | 2 | ~1938 |
Census Appearances
1930
Mercer, New …
Head, age 21
Mercer, New Jersey · implied b. ~1909 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Married |
| Birthplace | New Jersey |
| Age at First Marriage | 18 |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Occupation | worker |
| Industry | wire mill |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 29 |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Mercer-County, New …
Head, age 31
Mercer-County, New Jersey · implied b. ~1909 — 9 household members
| Surname | Knapp |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Trenton City |
| 1935 Residence (County) | Mercer |
| Occupation | Dust Presser |
| Industry | Porcelain Wks |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 · New Jersey
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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 — Mercer-County, New Jersey
Open full size
1940 US Federal Census — Mercer-County, New Jersey
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-02436-00767)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Alton Brown | 32 | Son | Musician | New Jersey |
| 42 | Gilbert Penrose | 31 | Head | Salesman | New Jersey |
| 43 | Isabelle Penrose | 29 | Wife | — | New York |
| 44 | Isabella Penrose | 4 | Daughter | — | New York |
| 45 | Frances Brown | 46 | Boarder | Mail Man | New Jersey |
| 46 | John Macmullen | 37 | Head | Tool Maker | Scotland |
| 47 | Nancy Macmullen | 34 | Wife | Typist | New Jersey |
| 48 | Anthony Chepole | 44 | Head | Hole Maker | Italy |
| 49 | Rose Chepole | 44 | Wife | — | Italy |
| 50 | Rose Chepole | 17 | Daughter | — | New Jersey |
| 51 | Josephine Chepole | 16 | Daughter | — | New Jersey |
| 52 | Angeline Chepole | 15 | Daughter | — | New Jersey |
| 53 | Glenn Chepole | 13 | Daughter | — | New Jersey |
| 54 | Emma Chepole | 11 | Daughter | — | New Jersey |
| 55 | Angelo Chepole | 7 | Son | — | New Jersey |
| 56 | William Knapp THIS PERSON | 31 | Head | Dust Presser | New Jersey |
| 57 | Jennie M. Knapp | 29 | Wife | — | New Jersey |
| 58 | William Knapp | 13 | Son | — | New Jersey |
| 59 | Bernard Knapp | 11 | Son | — | New Jersey |
| 60 | Laurel Knapp | 10 | Daughter | — | New Jersey |
| 61 | Fred Knapp | 8 | Son | — | New Jersey |
| 62 | Richard Knapp | 6 | Son | — | New Jersey |
| 63 | John Knapp | 5 | Son | — | New Jersey |
| 64 | Ellen Jane Knapp | 2 | Daughter | — | New Jersey |
| 65 | Michael Dudash | 34 | Head | Mail Hebrew | New Jersey |
| 66 | Mary Dudash | 30 | Wife | — | Connecticut |
| 67 | Mary Dudash | 13 | Daughter | — | New Jersey |
| 68 | Michael P. Dudash | 10 | Son | — | New Jersey |
| 69 | Robert F. Dudash | 5 | Son | — | New Jersey |
| 70 | Earl H. Dewbury | 37 | Head | Foreman | New Jersey |
| 71 | Gertrude Dewbury | 31 | Wife | — | New Jersey |
| 72 | Muriel Dewbury | 13 | Daughter | — | New Jersey |
| 73 | Evelyn Dewbury | 7 | Daughter | — | New Jersey |
| 74 | Russel H. Burroughs | 45 | Head | Bus Driver | New Jersey |
| 75 | Goldie R. Burroughs | 16 | Daughter | — | New Jersey |
| 76 | Wallace Burroughs | 14 | Son | — | New Jersey |
| 77 | Raymond Burroughs | 11 | Son | — | New Jersey |
| 78 | Leon Burroughs | 49 | Brother | Dealer | New Jersey |
| 79 | Catherine Hass | 35 | Servant | Servant | New Jersey |
Related Census Records
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)