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John Lucas — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Clay-County, Indiana
Our Model Tree links this John Lucas across the 1930 and 1940 US Censuses in Clay-County, Indiana (XGBoost, ~Confirmed) — first a son (b.~1926), then head of a 9-person household.
Age 14
b. ~1926
Male
Son
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Clay-County, Indiana |
| Surname | Lucas |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Knightsville |
| 1935 Residence (County) | Clay |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | G 8 |
| 1935 Residence | Same House |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Township / Ward | Knightsville |
| 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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Martha Lucas | Daughter | — | 16 | ~1924 |
| Ruth Lucas | Daughter | — | 12 | ~1928 |
| Ross Lucas | Head | — | 47 | ~1893 |
| Stanley Lucas | Son | — | 15 | ~1925 |
| Robert Lucas | Son | — | 10 | ~1930 |
| James Lucas | Son | — | 20 | ~1920 |
| Thomas Lucas | Son | — | 24 | ~1916 |
| John Lucas | Son | — | 14 | ~1926 |
| Alma Lucas | Spouse | — | 48 | ~1892 |
Census Appearances
1930
Clay, Indiana
Son, age 4
Clay, Indiana · implied b. ~1926 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lucas |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Occupation | none |
| Can Read/Write | No |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Clay-County, Indiana
Son, age 14
Clay-County, Indiana · implied b. ~1926 — 9 household members
| Surname | Lucas |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Knightsville |
| 1935 Residence (County) | Clay |
| Income (1939) | 0 |
| Highest Grade | G 8 |
| 1935 Residence | Same House |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 John Lucas across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Lucas
Son · 1940 · age 14 · b. ~1926 · Indiana
★ You are viewing this record
Sibling
James Lucas
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Lucas
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martha Lucas
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Lucas
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stanley Lucas
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruth 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 — Clay-County, Indiana
Open full size
1940 US Federal Census — Clay-County, Indiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01032-00663)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Martha Wells | 33 | Head | — | Indiana |
| 42 | Norma Jean Wells | 12 | Granddaughter | — | Indiana |
| 43 | Richard L. Wells | 10 | Grandson | — | Indiana |
| 44 | August Funk | 71 | Head | — | Germany |
| 45 | Anna G. Funk | 66 | Wife | — | Germany |
| 46 | Ross Lucas | 47 | Head | Miner | Indiana |
| 47 | Alma Lucas | 48 | Wife | — | Indiana |
| 48 | Thomas Lucas | 24 | Son | Miner | Indiana |
| 49 | James Lucas | 20 | Son | Attendant | Indiana |
| 50 | Stanley Lucas | 15 | Son | Laborer | Indiana |
| 51 | Martha Jane Lucas | 16 | Daughter | — | Indiana |
| 52 | John Lucas THIS PERSON | 14 | Son | — | Indiana |
| 53 | Ruth Lucas | 12 | Daughter | — | Indiana |
| 54 | Robert Lucas | 10 | Son | — | Indiana |
| 55 | Irvin C. Potter | 57 | Head | Real Estate Agent | Indiana |
| 56 | Elizabeth Potter | 60 | Wife | — | Ohio |
| 57 | John Stuckey | 42 | Head | Zinc Roller | Illinois |
| 58 | Mabel Stuckey | 41 | Wife | — | Illinois |
| 59 | Lida Brill | 69 | Head | — | Indiana |
| 60 | Donald H. French | 30 | Head | Metal Finisher | Indiana |
| 61 | Katherine Mae French | 24 | Wife | — | Montana |
| 62 | Barbara Kay French | 6 | Daughter | — | Indiana |
| 63 | Clifford Chatham | 51 | Head | Laborer | Indiana |
| 64 | Grace Chatham | 44 | Wife | — | Indiana |
| 65 | Willard Chatham | 21 | Son | Laborer | Indiana |
| 66 | Angelina Chatham | 15 | Daughter | Saleslady | Indiana |
| 67 | Bonnie Chatham | 13 | Daughter | — | Indiana |
| 68 | Charles Chatham | 26 | Son | Knitter | Indiana |
| 69 | Amy Chatham | 22 | Daughter-in-law | — | Indiana |
| 70 | Charles William Chatham | 2 | Grandson | — | North Carolina |
| 71 | Susie Mae Barr | 77 | Head | — | Indiana |
| 72 | Lonnie Walton | 61 | Son | Laborer | Indiana |
| 73 | Dan Guilford | 72 | Head | — | Indiana |
| 74 | Lewis Kempton | 59 | Head | Farm Laborer | Illinois |
| 75 | Jessie Kempton | 51 | Wife | — | Illinois |
| 76 | Robert Kempton | 17 | Son | — | Illinois |
| 77 | Daniel Doty | 76 | Father-in-law | — | Illinois |
| 78 | Fred Schultz | 28 | Head | Salesman | Indiana |
| 79 | Clara Schultz | 28 | Wife | — | Nebraska |
| 80 | Yvonne Schultz | 9 | Daughter | — | Indiana |
Related Census Records
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)