RJ
Robert Jones — 1940 US Census Record
Model Tree available1940 United States Federal Census · Alameda-County, California
Our Model Tree links this Robert Jones across the 1920, 1930 and 1940 US Censuses in Alameda-County, California (XGBoost, ~Confirmed), with identified parents James & Llewellyn — first a son (b.~1919), then head of a 3-person household.
Age 21
b. ~1919
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Alameda-County, California |
| Surname | Jones |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Albany City |
| 1935 Residence (County) | Alameda |
| Additional Details | |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | Albany City |
| Est. Birth Year | ~1919 |
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 Robert | Age | Birth yr |
|---|---|---|---|---|
| Llewellyn Jones | Head | — | 47 | ~1893 |
| Robert Jones | Son | — | 21 | ~1919 |
| Maybelle Jones | Spouse | — | 47 | ~1893 |
Census Appearances
1920
Alameda, California
Son, age 1
Alameda, California · implied b. ~1919 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jones |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
Alameda, California
Son, age 11
Alameda, California · implied b. ~1919 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jones |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | California |
| Mother's Birthplace | California |
| Occupation | Clerk |
| Industry | Federal |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Alameda-County, California
Son, age 21
Alameda-County, California · implied b. ~1919 — 3 household members
| Surname | Jones |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | Albany City |
| 1935 Residence (County) | Alameda |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
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 Robert Jones across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Jones (~0.92 confidence) and father Llewellyn Jones (~0.92 confidence) and father Lewellen Jones (~0.92 confidence) and mother Maybelle Jones (~0.92 confidence) and mother Mabel Jones (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Jones
b. ~1895
Source father
● Household
· direct · ~0.92
Father
Llewellyn Jones
b. ~1893
Source father
● Household
· direct · ~0.92
Father
Lewellen Jones
b. ~1893
Source father
● Household
· direct · ~0.92
Mother
Maybelle Jones
b. ~1893
Source mother
● Household
· direct · ~0.92
Mother
Mabel Jones
b. ~1898
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Jones
Son · 1940 · age 21 · b. ~1919 · California
★ 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 — Alameda-County, California
Open full size
1940 US Federal Census — Alameda-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00186-00350)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Jack Jones | 10 | Son | — | California |
| 2 | Llewellyn Jones | 47 | Head | Machinist | California |
| 3 | Maybelle Jones | 47 | Wife | — | California |
| 4 | Robert Jones THIS PERSON | 21 | Son | — | California |
| 5 | Charles J. Bowers | 68 | Head | — | Canada-Eng |
| 6 | Grace W. Bowers | 59 | Wife | — | Massachusetts |
| 7 | Marc Abbott | 37 | Head | Chemist | California |
| 8 | Jeannette Abbott | 33 | Wife | — | California |
| 9 | Carrie Burnham | 59 | Head | — | California |
| 10 | John C. Burnham | 30 | Son | Advertising | California |
| 11 | Lee Middelkauff | 51 | Head | Shipping Clerk | Pennsylvania |
| 12 | Gertrude Middelkauff | 40 | Wife | — | Pennsylvania |
| 13 | Mary Middelkauff | 80 | Mother | — | Pennsylvania |
| 14 | Fred R. Bert | 48 | Head | Accountant | Utah |
| 15 | Adele B. Bert | 46 | Wife | — | England |
| 16 | Richard Bert | 15 | Son | — | Oregon |
| 17 | Garth Bert | 11 | Son | — | California |
| 18 | Charles H. Monroe | 45 | Head | Executive | Missouri |
| 19 | Virginia Monroe | 42 | Wife | — | Oklahoma |
| 20 | Virginia A. Monroe | 16 | Daughter | — | California |
| 21 | Gordon Monroe | 8 | Son | — | California |
| 22 | Otto Erikson | 54 | Head | Termite Ext. | Minnesota |
| 23 | Maud Erikson | 44 | Wife | — | Missouri |
| 24 | Louise Erikson | 34 | Daughter | Chemist | Oklahoma |
| 25 | Arnold Ballwang | 38 | Head | Accountant | Wisconsin |
| 26 | Esther Ballwang | 34 | Wife | — | Montana |
| 27 | Karen Ballwang | 2 | Daughter | — | California |
| 28 | William Brainard | 48 | Head | Electrician | California |
| 29 | Edith Brainard | 44 | Wife | — | California |
| 30 | William Brainard | 19 | Son | — | California |
| 31 | Le Ora Brainard | 15 | Daughter | — | California |
| 32 | William Heafey | 44 | Head | Bank Teller | California |
| 33 | Verna Heafey | 41 | Wife | — | California |
| 34 | Patricia Heafey | 12 | Daughter | — | California |
| 35 | Thomas Heafey | 5 | Son | — | California |
| 36 | Denise Heafey | 4 | Daughter | — | California |
| 37 | C. Willard Hancock | 23 | Head | Sales Bldg. Material | Washington |
| 38 | Helen S. Hancock | 23 | Wife | — | Washington |
| 39 | Judith Hancock | 1 | Daughter | — | California |
| 40 | William Pearl | 42 | Head | Elementary Teacher | California |
Pedigree Summary
Robert
Gen 1 · 5 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)