LJ
Lois Jones — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Lois Jones across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 9-person household.
Age 12
b. ~1928
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Jones |
| Given Name | Lois |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| Additional Details | |
| Highest Grade | No 8 |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| Est. Birth Year | ~1928 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Lois | Age | Birth yr |
|---|---|---|---|---|
| Audrey Warknimont | Daughter | — | 20 | ~1920 |
| Lois Jones | Daughter | — | 12 | ~1928 |
| Ann O'Herron | Daughter | — | 13 | ~1927 |
| Robert Warknimont | Head | — | 50 | ~1890 |
| Thomas Hansen | Other | — | 79 | ~1861 |
| Sidney Willner | Son | — | 50 | ~1890 |
| Andrew Vrtjak | Son | — | 23 | ~1917 |
| Robert Warknimont | Son | — | 14 | ~1926 |
| Marie Warknimont | Spouse | — | 45 | ~1895 |
Census Appearances
1930
Cook, Illinois
Daughter, age 2
Cook, Illinois · implied b. ~1928 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jones |
| Given Name | Lois |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Scotland |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 12
Cook-County, Illinois · implied b. ~1928 — 9 household members
| Surname | Jones |
| Given Name | Lois |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| Highest Grade | No 8 |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Lois Jones across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Lois Jones
Daughter · 1940 · age 12 · b. ~1928 · Illinois
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Sibling
Sidney Willner
Sibling · 1940 · age 50
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Warknimont
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Audrey Warknimont
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ann O'Herron
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Andrew Vrtjak
Sibling · 1940 · age 23
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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
22 people indexed on this census page (nara:1940:m-t0627-00994-00353)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Catherine Evans | 40 | Wife | — | Wales |
| 2 | Norman Jr Johnson | 2 | Son | — | Illinois |
| 3 | Robert Warknimont | 50 | Head | Electrical Foreman | Illinois |
| 4 | Marie Warknimont | 45 | Wife | — | Illinois |
| 5 | Audrey Warknimont | 20 | Daughter | — | Illinois |
| 6 | Robert Warknimont | 14 | Son | — | Illinois |
| 7 | Andrew R. Vrtjak | 23 | Son | — | Illinois |
| 8 | Sidney Willner | 50 | Son | Fish Butcher | Wisconsin |
| 9 | Ann O'Herron | 13 | Daughter | — | Illinois |
| 10 | Lois Jones THIS PERSON | 12 | Daughter | — | Illinois |
| 11 | Thomas Hansen | 79 | Foster Son | — | Norway |
| 12 | Paul F Blackwell | 31 | Head | Real Estate Salesman | Illinois |
| 13 | Louise Blackwell | 28 | Wife | — | Minnesota |
| 14 | Patricia Blackwell | 1 | Daughter | — | Illinois |
| 15 | Ralph Caffarello | 20 | Son | Airplane Mechanic | Illinois |
| 16 | Patricia Gits | 10 | Daughter | — | Illinois |
| 17 | Margaret Lundberg | 54 | Mother-in-law | Housekeeper | Norway |
| 18 | Verma Johnson | 19 | Lodger | House Keeper | Iowa |
| 19 | John Powers | 23 | Son | — | Minnesota |
| 20 | Arthur Koepke | 27 | Head | Pattern Maker | Illinois |
| 21 | Helen Koepke | 26 | Wife | Retail Clerk | Illinois |
| 22 | Dennis Koepke | 1 | Son | — | Illinois |
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)