MJ
Margaret Jones — 1940 US Census Record
Model Tree available1940 United States Federal Census · Alameda-County, California
Our Model Tree links this Margaret Jones across the 1920, 1930 and 1940 US Censuses in Alameda-County, California (XGBoost, ~Confirmed), with identified parents Rebecca & Arthur — first a daughter (b.~1912), then head of a 7-person household.
Age 28
b. ~1912
Female
Daughter
Born: Washington
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Alameda-County, California |
| Surname | Jones |
| Given Name | Margaret D |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | Berkeley |
| 1935 Residence (County) | Alameda |
| Additional Details | |
| Occupation | Lab Technician |
| Industry | Medical |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1430 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
| Occupation | Lab Technician |
| Township / Ward | Berkeley |
| Est. Birth Year | ~1912 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| Margaret Jones | Daughter | — | 28 | ~1912 |
| Arthur Tibbs | Head | — | 53 | ~1887 |
| Rebecca Jones | Other | — | 60 | ~1880 |
| Harold Tibbs | Son | — | 18 | ~1922 |
| Norman Tibbs | Son | — | 24 | ~1916 |
| Stanley Tibbs | Son | — | 20 | ~1920 |
| Ethel Tibbs | Spouse | — | 56 | ~1884 |
Census Appearances
1920
Alameda, California
Daughter, age 8
Alameda, California · implied b. ~1912 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jones |
| Given Name | Margaret G |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Kansas |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1930
Alameda, California
Daughter, age 18
Alameda, California · implied b. ~1912 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jones |
| Given Name | Margaret G |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Washington |
| Age at First Marriage | no |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Kansas |
| Occupation | student |
| Industry | none |
| Can Read/Write | Yes |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1940
Alameda-County, California
Daughter, age 28
Alameda-County, California · implied b. ~1912 — 7 household members
| Surname | Jones |
| Given Name | Margaret D |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Washington |
| 1935 Residence (City) | Berkeley |
| 1935 Residence (County) | Alameda |
| Occupation | Lab Technician |
| Industry | Medical |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1430 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
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 Margaret Jones across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Rebecca Jones (~0.92 confidence) and father Arthur Tibbs (~0.92 confidence) and mother Ethel Tibbs (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Rebecca Jones
b. ~1881
Source mother
● Household
· direct · ~0.92
Father
Arthur Tibbs
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Ethel Tibbs
b. ~1884
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Margaret Jones
Daughter · 1940 · age 28 · b. ~1912 · California
★ You are viewing this record
Sibling
Harold Tibbs
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Norman Tibbs
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stanley Tibbs
Sibling · 1940 · age 20
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 — 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-t0627-00188-00574)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Delbert Lundel | 17 | Son | — | Missouri |
| 2 | Chandis Lundel | 14 | Son | — | California |
| 3 | Arthur E Tibbs | 53 | Head | Carpenter | England |
| 4 | Ethel K Tibbs | 56 | Wife | — | England |
| 5 | Norman H Tibbs | 24 | Son | Teller | England Canada |
| 6 | Stanley J Tibbs | 20 | Son | Carpenter | England Canada |
| 7 | Harold A Tibbs | 18 | Son | — | England Canada |
| 8 | Margaret D Jones THIS PERSON | 28 | Daughter | Lab Technician | Washington |
| 9 | Rebecca Jones | 60 | Mother | — | Kansas |
| 10 | Imaro Sammon | 59 | Head | — | Turkey |
| 11 | George Sammon | 26 | Son | Student Asst | Turkey |
| 12 | Stanley Sammon | 25 | Son | Clerk | Turkey |
| 13 | Theodore Mathieson | 27 | Head | Delivery Clerk | California |
| 14 | Teresa Mathieson | 24 | Wife | Clerk | California |
| 15 | Lloyd A Barkman | 43 | Head | Carpenter | Nebraska |
| 16 | Hortense E Barkman | 42 | Wife | — | Mass |
| 17 | Paula H Barkman | 16 | Daughter | — | Calif |
| 18 | Florence Babb | 74 | Aunt | — | Mass |
| 19 | Ernest Frown | 42 | Head | Sec. Foreman | England |
| 20 | Ruth B Frown | 34 | Wife | — | Texas |
| 21 | Fred Frown | 14 | Son | — | California |
| 22 | Philip Frown | 13 | Son | — | California |
| 23 | Amedeo Cuvellini | 48 | Head | Dyeing | Italy |
| 24 | Edith F Cuvellini | 48 | Wife | Dyer | California |
| 25 | Edward Futteri | 25 | Stepson | Radio Repairman | California |
| 26 | Evelyn Futteri | 16 | Stepdaughter | — | California |
| 27 | Hayashi Ryuichi | 51 | Head | Store Manager | Japan |
| 28 | Margaret Ryuichi | 37 | Wife | — | Hawaii |
| 29 | Doris Ryuichi | 20 | Daughter | — | California |
| 30 | Eldup Ryuichi | 18 | Daughter | — | California |
| 31 | Harold Ryuichi | 10 | Son | — | California |
| 32 | Annie C Freame | 74 | Head | — | Scotland |
| 33 | Elizabeth Freame | 54 | Daughter | — | Utah |
| 34 | Ann C Freame | 38 | Daughter | — | California |
| 35 | Harvey Parkinson | 69 | Head | Salesman | New York |
| 36 | Ella Parkinson | 67 | Wife | — | New York |
| 37 | John H O'Brien | 55 | Head | Gardner | Ohio |
| 38 | Delia F O'Brien | 58 | Wife | — | New York |
| 39 | Eleanor O'Brien | 19 | Daughter | Secretary | California |
| 40 | Jean O'Brien | 17 | Daughter | — | California |
Pedigree Summary
Margaret + 3 siblings
Gen 1 · 3 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)