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John Smith — 1940 US Census Record
Model Tree available1940 United States Federal Census · New-Castle-County, Delaware
Our Model Tree links this John Smith across the 1920, 1930 and 1940 US Censuses in New-Castle-County, Delaware (XGBoost, ~Confirmed), with identified parents George & Manuel — first a son (b.~1909), then head of a 5-person household.
Age 31
b. ~1909
Male
Son
Born: Delaware
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | New-Castle-County, Delaware |
| Surname | Smith |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Delaware |
| 1935 Residence (City) | Wilmington |
| 1935 Residence (County) | New Castle |
| Additional Details | |
| Occupation | Salesman |
| Industry | Insurance Co |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 2500 |
| Highest Grade | Hs 3 |
| 1935 Residence | Same place |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
| Occupation | Salesman |
| Township / Ward | Wilmington |
| 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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Marion Smith | Daughter | — | 32 | ~1908 |
| Manuel Smith | Head | — | 51 | ~1889 |
| Ronald Smith | Other | — | 5 | ~1935 |
| John Smith | Son | — | 31 | ~1909 |
| Bertha Smith | Spouse | — | 52 | ~1888 |
Census Appearances
1920
New Castle, …
Son, age 9
New Castle, Delaware · implied b. ~1911 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Delaware |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Delaware |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
1930
New Castle, …
Son, age 20
New Castle, Delaware · implied b. ~1910 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Delaware |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Delaware |
| Occupation | Brakeman |
| Industry | Steam railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
1940
New-Castle-County, Delaware
Son, age 31
New-Castle-County, Delaware · implied b. ~1909 — 5 household members
| Surname | Smith |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Delaware |
| 1935 Residence (City) | Wilmington |
| 1935 Residence (County) | New Castle |
| Occupation | Salesman |
| Industry | Insurance Co |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 2500 |
| Highest Grade | Hs 3 |
| 1935 Residence | Same place |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
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 Smith across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father George Smith (~0.92 confidence) and father Manuel Smith (~0.92 confidence) and mother Mary Smith (~0.92 confidence) and mother Bertha Smith (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
George Smith
b. ~1871
Source father
● Household
· direct · ~0.92
Father
Manuel Smith
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Mary Smith
b. ~1873
Source mother
● Household
· direct · ~0.92
Mother
Bertha Smith
b. ~1888
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Smith
Son · 1940 · age 31 · b. ~1909 · Delaware
★ You are viewing this record
Sibling
Marion Smith
Sibling · 1940 · age 32
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
1940 US Federal Census — New-Castle-County, Delaware
Open full size
1940 US Federal Census — New-Castle-County, Delaware
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00551-00518)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Teresa Bachman | 73 | Mother | — | Germany |
| 42 | Manuel R. Smith | 51 | Head | Brass Polisher | Delaware |
| 43 | Bertha M. Smith | 52 | Wife | — | Delaware |
| 44 | John J. Smith THIS PERSON | 31 | Son | Salesman | Delaware |
| 45 | Marion Smith | 32 | Daughter | — | Delaware |
| 46 | Ronald W. Smith | 5 | Grandson | — | — |
| 47 | — | None | — | — | — |
| 48 | Maude E. Arthur | 45 | Head | — | Delaware |
| 49 | Ruth A. Arthur | 20 | Daughter | Stenber | Delaware |
| 50 | Geo. J. Floberg | 67 | Head | Clerical | Delaware |
| 51 | Mary Floberg | 91 | Mother | — | Delaware |
| 52 | William Riley | 66 | Head | — | Delaware |
| 53 | Minnie Riley | 64 | Wife | — | Pennsylvania |
| 54 | Wm. J. Massey | 34 | Head | Supervisor | Delaware |
| 55 | Elizabeth Massey | 26 | Wife | — | Maine |
| 56 | Jessie Gerard | 70 | Aunt | — | Scotland |
| 57 | Thomas Brown | 70 | Head | Elevator Oper | Ireland |
| 58 | Margaret Brown | 64 | Wife | — | Ireland |
| 59 | Thomas Jr. Brown | 41 | Son | Bricklayer | Delaware |
| 60 | Wm. H. Thompson | 36 | Son-in-law | Manager | Ireland |
| 61 | Jane Thompson | 36 | Daughter | — | Delaware |
| 62 | Agnes Eberhardt | 55 | Head | Bookkeeper | Delaware |
| 63 | James Eberhardt | 60 | Brother | Helper | Penna |
| 64 | Anna Eberhardt | 44 | Sister | Teacher | Delaware |
| 65 | Charles Eberhardt | 38 | Nephew | Electrician | Delaware |
| 66 | Mary Eberhardt | 31 | Niece | — | Delaware |
| 67 | Mildred Williams | 37 | Head | — | Delaware |
| 68 | Elizabeth Smith | 50 | Daughter | — | Delaware |
| 69 | Lee M. Bell | 38 | Head | Electrician | Penna |
| 70 | Catherine Bell | 37 | Wife | — | Penna |
| 71 | Joan Bell | 15 | Daughter | — | Penna |
| 72 | L. Robert Hopkins | 42 | Head | Salesman | Delaware |
| 73 | Mary Hopkins | 45 | Wife | — | Maryland |
| 74 | L. Robert Jr. Hopkins | 11 | Son | — | Delaware |
| 75 | James O'Connor | 38 | Head | Foreman | Delaware |
| 76 | Marie O'Connor | 42 | Wife | Stenographer | Delaware |
| 77 | Paul O'Connor | 17 | Son | — | Delaware |
| 78 | Donald O'Connor | 15 | Son | — | Delaware |
| 79 | Eleanor Lewis | 48 | Sister-in-law | — | Delaware |
| 80 | Head Cook, Boyd H. | None | M | Amer. Car Foundry | — |
Related Census Records
Pedigree Summary
John + 1 sibling
Gen 1 · 4 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)