RJ
Ralph Jones — 1940 US Census Record
Model Tree available1940 United States Federal Census · New-Castle-County, Delaware
Our Model Tree links this Ralph Jones across the 1910, 1920, 1930 and 1940 US Censuses in New-Castle-County, Delaware (XGBoost, ~Confirmed), with identified parents Howard & Mary — first a head (b.~1904), then head of a 3-person household.
Age 36
b. ~1904
Male
Head
Born: Delaware
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | New-Castle-County, Delaware |
| Surname | Jones |
| Given Name | Ralph W. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Delaware |
| 1935 Residence (City) | Wilmington |
| 1935 Residence (County) | New Castle |
| Additional Details | |
| Occupation | Math. Professor |
| Industry | University |
| Class of Worker | GW |
| Hours Worked | 49 |
| Income (1939) | 2300 |
| Highest Grade | C 5 |
| 1935 Residence | Delaware |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
| Occupation | Math. Professor |
| Township / Ward | Newark |
| Est. Birth Year | ~1904 |
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 Ralph | Age | Birth yr |
|---|---|---|---|---|
| Carlene Jones | Daughter | — | 3 | ~1937 |
| Ralph Jones | Head | — | 36 | ~1904 |
| Alice Jones | Spouse | — | 33 | ~1907 |
Census Appearances
1910
New Castle, …
Son, age 6
New Castle, Delaware · implied b. ~1904 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jones |
| Given Name | Ralph S |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Delaware |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Delaware |
| Occupation | none |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
1920
New Castle, …
Son, age 16
New Castle, Delaware · implied b. ~1904 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jones |
| Given Name | Ralph W |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Delaware |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Delaware |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
1930
New Castle, …
Son, age 26
New Castle, Delaware · implied b. ~1904 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jones |
| Given Name | Ralph W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Delaware |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Delaware |
| Occupation | Instructor |
| Industry | College |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
1940
New-Castle-County, Delaware
Head, age 36
New-Castle-County, Delaware · implied b. ~1904 — 3 household members
| Surname | Jones |
| Given Name | Ralph W. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Delaware |
| 1935 Residence (City) | Wilmington |
| 1935 Residence (County) | New Castle |
| Occupation | Math. Professor |
| Industry | University |
| Class of Worker | GW |
| Hours Worked | 49 |
| Income (1939) | 2300 |
| Highest Grade | C 5 |
| 1935 Residence | Delaware |
| 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 Ralph Jones across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Howard Jones (~0.81 confidence) and mother Mary Jones (~0.81 confidence) and mother Gertrude Jones (~0.92 confidence) and father Llewellyn Jones (~0.92 confidence) and father Llewellyn Jones (~0.92 confidence) and father Llewellyn Jones (~0.92 confidence) and mother Gertrude Jones (~0.92 confidence). The pedigree spans 2 generations with 7 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.89
Father
Howard Jones
b. ~1825
Source father>father
● Household
· direct · ~0.81
Mother
Mary Jones
b. ~1829
Source father>mother
● Household
· direct · ~0.81
Mother
Gertrude Jones
b. ~1867
Source mother
● Household
· direct · ~0.92
Father
Llewellyn Jones
b. ~1867
Source father
● Household
· direct · ~0.92
Father
Llewellyn Jones
b. ~1870
Source father
● Household
· direct · ~0.92
Father
Llewellyn Jones
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Gertrude Jones
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Ralph Jones
Head · 1940 · age 36 · b. ~1904 · Delaware
★ 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 — 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-t0627-00546-00251)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Thomas K. Runk | 13 | Son | — | Delaware |
| 42 | Martin M. Daugherty | 45 | Head | Agriculture Prof | Texas |
| 43 | Kate D. Daugherty | 49 | Wife | Home Economics Inst | Texas |
| 44 | John M. Morton | 34 | Lodger | Prof. Chemistry | Canada |
| 45 | Lawrence P. Healey | 25 | Lodger | Instructor | Massachusetts |
| 46 | James M. Watkins | 29 | Lodger | Agronomist | Alabama |
| 47 | Raymond W. Heim | 53 | Head | Education | Pennsylvania |
| 48 | Bess F. Heim | 50 | Wife | — | Pennsylvania |
| 49 | Ralph W. Jones THIS PERSON | 36 | Head | Math. Professor | Delaware |
| 50 | Alice M. Jones | 33 | Wife | — | Delaware |
| 51 | Carlene Jones | 3 | Daughter | — | — |
| 52 | James Mackenzie | 44 | Head | Owner | Pennsylvania |
| 53 | Margaret Mackenzie | 47 | Wife | — | Maryland |
| 54 | A. L. Geist | 47 | Head | Owner | Maryland |
| 55 | Anna Geist | 45 | Wife | Secretary | Maryland |
| 56 | Frederick A. Wheeless | 60 | Head | Engineer | Iowa |
| 57 | Grace D. Wheeless | 55 | Wife | — | Arizona |
| 58 | Estella Wheeless | 32 | Daughter | Librarian | California |
| 59 | Thomas A. Baker | 47 | Head | Animal Industry | Georgia |
| 60 | Ruth E. Baker | 41 | Wife | — | Maryland |
| 61 | Melissa Baker | 14 | Daughter | — | Delaware |
| 62 | Willard D. Crater | 45 | Head | Research Chemist | New Jersey |
| 63 | Ruth Crater | 45 | Wife | — | New Jersey |
| 64 | Willard D. Jr. Crater | 21 | Son | — | New Jersey |
| 65 | Russell H. Morris | 48 | Head | Trust Officer | Maryland |
| 66 | Ruth K. Morris | 38 | Wife | — | Delaware |
| 67 | Howard K. Preston | 51 | Head | English Inst. | New Jersey |
| 68 | Mildred H. Preston | 43 | Wife | — | New Jersey |
| 69 | Thomas E. Preston | 16 | Son | — | Delaware |
| 70 | John K. Spinder | 45 | Head | Chemist | Indiana |
| 71 | Gertrude C. Spinder | 47 | Wife | — | New Jersey |
| 72 | Priscilla Spinder | 15 | Daughter | — | Alabama |
| 73 | John Jr. Spinder | 7 | Son | — | Delaware |
| 74 | William E. Moore | 52 | Head | Manager | Pennsylvania |
| 75 | Anna Moore | 53 | Wife | — | Pennsylvania |
| 76 | Louis A. Sterns | 47 | Head | Entomologist | Massachusetts |
| 77 | Margaret J. Sterns | 45 | Wife | — | Illinois |
| 78 | Reid J. Sterns | 21 | Son | — | Virginia |
| 79 | Delevan A. Sterns | 14 | Son | — | Virginia |
| 80 | Frances Sterns | 17 | Daughter | — | Virginia |
Pedigree Summary
Ralph
Gen 1 · 5 parents
~0.92
Gen 2 · 2 grandparents
~0.81
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)