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John Blackwell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Niagara-County, New York
Our Model Tree links this John Blackwell across the 1930 and 1940 US Censuses in Niagara-County, New York (XGBoost, ~Confirmed) — first a head (b.~1911), then head of a 8-person household.
Age 29
b. ~1911
Male
Head
Born: England
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Niagara-County, New York |
| Surname | Blackwell |
| Given Name | John L. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Niagara Falls |
| 1935 Residence (County) | Niagara |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Cyanide mixer |
| Industry | Chemical Plant |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 496 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth Country | England |
| Birthplace (normalized) | england |
| Occupation | Cyanide Mixer |
| Township / Ward | Niagara Falls |
| Est. Birth Year | ~1911 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Merton Myers | Son | — | 9 | ~1931 |
| Florence Myers | Daughter | — | 18 | ~1922 |
| Marion Myers | Daughter | — | 11 | ~1929 |
| John Blackwell | Son | — | 6 | ~1934 |
| John Blackwell | Head | — | 29 | ~1911 |
| Lillian Blackwell | Spouse | — | 35 | ~1905 |
| Leslie Blackwell | Son | — | 3 | ~1937 |
| Lillian Blackwell | Daughter | — | 5 | ~1935 |
Census Appearances
1930
Niagara, New …
Son, age 20
Niagara, New York · implied b. ~1910 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackwell |
| Given Name | John L. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | England |
| Naturalization Status | Naturalized |
| Year of Immigration | 1911 |
| Father's Birthplace | England |
| Mother's Birthplace | Canada English |
| Occupation | Laborer |
| Industry | Chemical Pl. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | England |
| Birthplace (normalized) | england |
1940
Niagara-County, New …
Head, age 29
Niagara-County, New York · implied b. ~1911 — 8 household members
| Surname | Blackwell |
| Given Name | John L. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Niagara Falls |
| 1935 Residence (County) | Niagara |
| Naturalization Status | Naturalized |
| Occupation | Cyanide mixer |
| Industry | Chemical Plant |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 496 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth Country | England |
| Birthplace (normalized) | england |
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 Blackwell across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Blackwell
Head · 1940 · age 29 · b. ~1911 · New York
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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 — Niagara-County, New York
Open full size
1940 US Federal Census — Niagara-County, New York
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-02698-00162)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Selma George | 66 | Head | — | Syria |
| 2 | Milton George | 50 | Son | Attendant | Kentucky |
| 3 | William J Barish | 68 | Lodger | Watchman | Austria |
| 4 | Theodore Galeant | 38 | Lodger | Rigger | New York |
| 5 | Russell Mucarella | 25 | Lodger | Laborer | New York |
| 6 | Elwin E. Clark | 37 | Head | Millwright | New York |
| 7 | Myrtle H. Clark | 35 | Wife | Cashier | New York |
| 8 | Robert Clark | 15 | Son | — | New York |
| 9 | Dorothy Clark | 13 | Daughter | — | New York |
| 10 | Norman Floyd | 12 | Son | — | New York |
| 11 | Norman Floyd | 9 | Son | — | New York |
| 12 | James Cushman | 46 | Head | — | New York |
| 13 | Ida Cushman | 46 | Wife | — | New York |
| 14 | Florence Cushman | 23 | Daughter | — | New York |
| 15 | Curtis Cushman | 20 | Son | — | New York |
| 16 | Audrey Cushman | 17 | Daughter | — | New York |
| 17 | Lawrence Nichols | 23 | Head | Painter | New York |
| 18 | Mazie Nichols | 18 | Wife | — | Maine |
| 19 | Frank Taylor | 57 | Head | Furnace-Man | Canada Eng |
| 20 | Annie Taylor | 54 | Wife | — | Canada Eng |
| 22 | John L. Blackwell THIS PERSON | 29 | Head | Cyanide Mixer | England |
| 23 | Lillian M. Blackwell | 35 | Wife | — | New York |
| 24 | John F. Blackwell | 6 | Son | — | New York |
| 25 | Lillian M. Blackwell | 5 | Daughter | — | New York |
| 26 | Leslie C. Blackwell | 3 | Son | — | New York |
| 27 | Florence Myers | 18 | Daughter | — | New York |
| 28 | Marion Myers | 11 | Daughter | — | New York |
| 29 | Merton Myers | 9 | Son | — | New York |
| 31 | William Marcklinger | 28 | Head | Trucker-Pull | New York |
| 32 | Betty Marcklinger | 21 | Wife | — | New York |
| 33 | Betty Ann Marcklinger | 2 | Daughter | — | New York |
| 34 | Sharon Lee Marcklinger | 1 | Daughter | — | New York |
| 35 | Nancy Carol Marcklinger | 0 | Daughter | — | New York |
| 36 | Leon Babbitt | 38 | Head | Senior Clerk | Michigan |
| 37 | Dorothy Babbitt | 38 | Wife | — | Illinois |
| 38 | Robert Babbitt | 17 | Son | Soda Fountain Attendant | New York |
| 39 | Jean Babbitt | 16 | Daughter | — | New York |
| 40 | James Babbitt | 14 | Son | — | New York |
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)