WK
William Knapp — 1940 US Census Record
Model Tree available1940 United States Federal Census · Queens-County, New York
Our Model Tree links this William Knapp across the 1920, 1930 and 1940 US Censuses in Queens-County, New York (XGBoost, ~Confirmed), with identified parents John & Joseph — first a son (b.~1915), then head of a 3-person household.
Age 25
b. ~1915
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Queens-County, New York |
| Surname | Knapp |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Queens borough |
| 1935 Residence (County) | Queens |
| Additional Details | |
| Occupation | Office Helper |
| Industry | Printing |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 676 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Office Helper |
| Township / Ward | Queens Borough |
| Est. Birth Year | ~1915 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Joseph Knapp | Head | — | 65 | ~1875 |
| Mary Knapp | Spouse | — | 64 | ~1876 |
| William Knapp | Son | — | 25 | ~1915 |
Census Appearances
1920
Queens, New …
Son, age 3
Queens, New York · implied b. ~1917 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Queens, New …
Son, age 14
Queens, New York · implied b. ~1916 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | William S. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Queens-County, New …
Son, age 25
Queens-County, New York · implied b. ~1915 — 3 household members
| Surname | Knapp |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Queens borough |
| 1935 Residence (County) | Queens |
| Occupation | Office Helper |
| Industry | Printing |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 676 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Knapp (~0.92 confidence) and father Joseph Knapp (~0.92 confidence) and father William Knapp (~0.92 confidence) and mother Bessie Knapp (~0.92 confidence) and mother Lillian Knapp (~0.92 confidence) and mother Mary Knapp (~0.92 confidence) and mother Mary Knapp (~0.92 confidence). The pedigree spans 1 generation with 7 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Knapp
b. ~1884
Source father
● Household
· direct · ~0.92
Father
Joseph Knapp
b. ~1875
Source father
● Household
· direct · ~0.92
Father
William Knapp
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Bessie Knapp
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Lillian Knapp
b. ~1886
Source mother
● Household
· direct · ~0.92
Mother
Mary Knapp
b. ~1883
Source mother
● Household
· direct · ~0.92
Mother
Mary Knapp
b. ~1876
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Knapp
Son · 1940 · age 25 · b. ~1915 · New York
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Queens-County, New York
Open full size
1940 US Federal Census — Queens-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02751-00406)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Jan Halland | 37 | Nephew | Clerical | New York |
| 2 | Charles Rehmann | 40 | Head | Butcher | New York |
| 3 | Effie Rehmann | 39 | Wife | — | New York |
| 4 | Charles Jr Rehmann | 16 | Son | — | New York |
| 5 | Ralph Richmond | 32 | Head | Fireman | New York |
| 6 | Ida Richmond | 29 | Wife | Operator | New York |
| 7 | Mabel Richmond | 7 | Daughter | — | New York |
| 8 | Clarence Cook | 44 | Head | Machinist | New York |
| 9 | Elizabeth Cook | 44 | Wife | — | New York |
| 10 | Robert Cook | 20 | Son | New Worker | New York |
| 11 | William Cook | 16 | Son | — | New York |
| 12 | Clarice Cook | 3 | Daughter | — | New York |
| 13 | Metax Cypriaks | 72 | Head | — | Germany |
| 14 | Edward Kehoe | 57 | Head | Laborer | New York |
| 15 | Mary Kehoe | 48 | Wife | — | New York |
| 16 | Marguerite Kehoe | 15 | Daughter | — | New York |
| 17 | Eileen Kehoe | 14 | Daughter | — | New York |
| 18 | Jane Kehoe | 11 | Daughter | — | New York |
| 19 | Jennie Haas | 59 | Head | — | New York |
| 20 | Josephine Haas | 28 | Daughter | Clerical | New York |
| 21 | Daughter Haas | None | F | Private Family | — |
| 22 | Cornelius Fleet | 70 | Lodger | — | New York |
| 23 | Joseph Radlevitz | 47 | Head | Shoe Repair | Hungary |
| 24 | Catherine Radlevitz | 43 | Wife | — | Hungary |
| 25 | Ludmila Radlevitz | 18 | Daughter | — | Connecticut |
| 26 | Christen Apelsen | 52 | Head | Carpenter | Norway |
| 27 | Johanna Apelsen | 54 | Wife | — | Norway |
| 28 | Gordon Apelsen | 21 | Son | Radio Technician | New York |
| 29 | Ethel Apelsen | 18 | Daughter | — | New York |
| 30 | Stanley Apelsen | 11 | Son | — | New York |
| 31 | Louisa Strini | 67 | Head | — | Austria |
| 32 | Frank Strini | 28 | Son | Baker | New York |
| 33 | Joseph Knapp | 65 | Head | Helper | New York |
| 34 | Mary Knapp | 64 | Wife | — | New Jersey |
| 35 | William Knapp THIS PERSON | 25 | Son | Office Helper | New York |
| 36 | Richard Beltz | 55 | Head | — | Russia |
| 37 | Minnie Beltz | 53 | Wife | — | Austria |
| 38 | C. Richard Jr Beltz | 31 | Son | Agent | New York |
| 39 | Frank Mayles | 40 | Head | Upholsterer | Pennsylvania |
| 40 | Marion Mayles | 38 | Wife | — | Pennsylvania |
Pedigree Summary
William
Gen 1 · 7 parents
~0.92
Max depth 4 (1900–1950 window)
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)