JL
James Lucas — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this James Lucas across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1926), then head of a 8-person household.
Age 14
b. ~1926
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Lucas |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | 6 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1926 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Rose Lucas | Daughter | — | 10 | ~1930 |
| Rita Lucas | Daughter | — | 17 | ~1923 |
| Margaret Lucas | Daughter | — | 31 | ~1909 |
| William Lucas | Head | — | 60 | ~1880 |
| Edward Lucas | Son | — | 12 | ~1928 |
| Eugene Lucas | Son | — | 18 | ~1922 |
| James Lucas | Son | — | 14 | ~1926 |
| Ann Lucas | Spouse | — | 70 | ~1870 |
Census Appearances
1930
Cook, Illinois
Son, age 6
Cook, Illinois · implied b. ~1924 — 41 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lucas |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 14
Cook-County, Illinois · implied b. ~1926 — 8 household members
| Surname | Lucas |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Income (1939) | 0 |
| Highest Grade | 6 |
| 1935 Residence | Same house |
| 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 James Lucas across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Lucas
Son · 1940 · age 14 · b. ~1926 · Illinois
★ You are viewing this record
Sibling
Rita Lucas
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eugene Lucas
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rose Lucas
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Lucas
Sibling · 1940 · age 31
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Lucas
Sibling · 1940 · age 12
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
40 people indexed on this census page (nara:1940:m-t0627-00956-00547)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Marian Gordon | 31 | Wife | — | Indiana |
| 42 | David Gordon | 13 | Son | — | Illinois |
| 43 | Clara Heilbronner | 46 | Head | Grocery Clerk | Illinois |
| 44 | Marie Heilbronner | 43 | Wife | — | Illinois |
| 45 | William Heilbronner | 22 | Son | Delivery Boy | Illinois |
| 46 | Leroy Heilbronner | 18 | Son | New Worker | Illinois |
| 47 | Leonard Heilbronner | 18 | Son | New Worker | Illinois |
| 48 | Frances Heilbronner | 77 | Mother | — | Illinois |
| 49 | Alex S. Speropoulos | 40 | Head | Salesman | Greece |
| 50 | Ethel Speropoulos | 30 | Wife | — | Greece |
| 51 | Mary Speropoulos | 9 | daughter | — | Illinois |
| 52 | Stella Speropoulos | 1 | daughter | — | Illinois |
| 53 | Peter S. Speropoulos | 46 | Head | Peddler | Greece |
| 54 | Bertha Speropoulos | 28 | Wife | — | Illinois |
| 55 | May Speropoulos | 8 | daughter | — | Illinois |
| 56 | John P. Wrigley | 55 | Head | Painter | Minnesota |
| 57 | Amanda Wrigley | 47 | Wife | — | N. Dakota |
| 58 | Marion Wrigley | 21 | daughter | Information Clerk | N. Dakota |
| 59 | Billie Wrigley | 18 | daughter | Typist | S. Dakota |
| 60 | John Wrigley | 15 | son | — | Minnesota |
| 61 | Janice Wrigley | 2 | daughter | — | Illinois |
| 62 | John D. Thomas | 32 | Head | Chef | Pennsylvania |
| 63 | Margaret Thomas | 33 | Wife | — | Pennsylvania |
| 64 | Lucille Thomas | 14 | daughter | — | Illinois |
| 65 | Darleen Thomas | 0 | daughter | — | Illinois |
| 66 | William Lucas | 60 | Head | Engineer | Illinois |
| 67 | Ann Lucas | 70 | Wife | — | Irish Free State |
| 68 | Margaret Lucas | 31 | daughter | Telephone Operator | Illinois |
| 69 | Eugene Lucas | 18 | Son | Stenographer | Illinois |
| 70 | Rita Lucas | 17 | daughter | — | Illinois |
| 71 | James Lucas THIS PERSON | 14 | Son | — | Illinois |
| 72 | Edward Lucas | 12 | Son | — | Illinois |
| 73 | Rose Mary Lucas | 10 | daughter | — | Illinois |
| 74 | Elizabeth Campbell | 71 | Head | — | Pennsylvania |
| 75 | Ella F. Campbell | 67 | daughter | — | Pennsylvania |
| 76 | David Campbell | 65 | son | — | Pennsylvania |
| 77 | Anna Campbell | 58 | sister | — | Nebraska |
| 78 | Selma Fasen | 66 | Head | — | Germany |
| 79 | Walter P. Fasen | 25 | Son | Teacher | Illinois |
| 80 | Delaine Fasen | 24 | daughter | General Office | 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)