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James Kirby — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Lake-County, Illinois
Our Model Tree links this James Kirby across the 1930 and 1940 US Censuses in Lake-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1926), then head of a 8-person household.
Age 14
b. ~1926
Male
Son
Born: West Virginia
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lake-County, Illinois |
| Surname | Kirby |
| Given Name | James |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | West Virginia |
| 1935 Residence (City) | Spring Grove |
| 1935 Residence (County) | McHenry |
| Additional Details | |
| Highest Grade | No 7 |
| 1935 Residence | Illinois |
| Birth State | West Virginia |
| Birth Country | United States |
| Birthplace (normalized) | west virginia |
| Township / Ward | North Chicago |
| 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 |
|---|---|---|---|---|
| William Kirby | Son | — | 12 | ~1928 |
| Eugene Kirby | Son | — | 5 | ~1935 |
| James Kirby | Head | — | 42 | ~1898 |
| Robert Kirby | Son | — | ~1940 | |
| Josephine Kirby | Daughter | — | 9 | ~1931 |
| Arthur Kirby | Son | — | 10 | ~1930 |
| Bertha Kirby | Spouse | — | 38 | ~1902 |
| James Kirby | Son | — | 14 | ~1926 |
Census Appearances
1930
Lake, Illinois
Son, age 4
Lake, Illinois · implied b. ~1926 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kirby |
| Given Name | James H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | West Virginia |
| Father's Birthplace | Virginia |
| Mother's Birthplace | West Virginia |
| Birth State | West Virginia |
| Birth Country | United States |
| Birthplace (normalized) | west virginia |
1940
Lake-County, Illinois
Son, age 14
Lake-County, Illinois · implied b. ~1926 — 8 household members
| Surname | Kirby |
| Given Name | James |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | West Virginia |
| 1935 Residence (City) | Spring Grove |
| 1935 Residence (County) | McHenry |
| Highest Grade | No 7 |
| 1935 Residence | Illinois |
| Birth State | West Virginia |
| Birth Country | United States |
| Birthplace (normalized) | west virginia |
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 Kirby across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Kirby
Son · 1940 · age 14 · b. ~1926 · Illinois
★ You are viewing this record
Sibling
William Kirby
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Josephine Kirby
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Kirby
Sibling · 1940 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arthur Kirby
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eugene Kirby
Sibling · 1940 · age 5
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 — Lake-County, Illinois
Open full size
1940 US Federal Census — Lake-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00830-00109)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Harry @ Mobile | 24 | head | Riveting Assembly | Illinois |
| 2 | Josephine Mobile | 23 | wife | Gluing | Illinois |
| 3 | Helen Davidovic | 54 | head | — | Yugoslavia |
| 4 | Sam Davidovic | 23 | son | New Worker | Illinois |
| 5 | Ann Davidovic | 21 | daughter | Bottle Washer | Illinois |
| 6 | Peter Davidovic | 20 | son | New Worker | Illinois |
| 7 | Mary Davidovic | 17 | daughter | Saleslady | Illinois |
| 8 | Mildred Davidovic | 16 | daughter | Servant | Illinois |
| 9 | Helen Davidovic | 15 | daughter | — | Illinois |
| 10 | Clyde Thomas | 26 | head | Laborer | Kentucky |
| 11 | Margaret @ Thomas | 26 | wife | — | Illinois |
| 12 | Allen Thomas | 7 | son | — | Illinois |
| 13 | Nancy Thomas | 4 | daughter | — | Illinois |
| 14 | Clyde Thomas | 2 | son | — | Illinois |
| 15 | Lynda Thomas | 0 | daughter | — | Illinois |
| 16 | James @ Kirby | 42 | head | Laborer | West Virginia |
| 17 | Bertha Kirby | 38 | wife | — | West Virginia |
| 18 | James Kirby THIS PERSON | 14 | son | — | West Virginia |
| 19 | William Kirby | 12 | son | — | Illinois |
| 20 | Arthur Kirby | 10 | son | — | Illinois |
| 21 | Josephine Kirby | 9 | daughter | — | Illinois |
| 22 | Eugene Kirby | 5 | son | — | Illinois |
| 23 | Robert Kirby | 0 | son | — | Illinois |
| 24 | Charles @ De Boo | 71 | head | — | Belgium |
| 25 | Mary De Boo | 65 | wife | — | Belgium |
| 26 | Louis De Boo | 35 | son | Shipping Clerk | Illinois |
| 27 | Ernest De Boo | 30 | son | Laborer | Illinois |
| 28 | Clementine De Boo | 23 | daughter | House Cleaning | Illinois |
| 29 | Henry Winters | 69 | head | Polisher & Electro Plater | Minnesota |
| 30 | Myrtle @ Winters | 31 | daughter | Bookkeeper | Illinois |
| 31 | Alice Winters | 29 | daughter | Killer | Illinois |
| 32 | Gladys Winters | 29 | daughter | Bieler | Illinois |
| 33 | Henrietta Winters | 23 | daughter | Switch Board Operator | Illinois |
| 34 | Christ Bombolis | 59 | head | Polisher | Greece |
| 35 | Christina @ Bombolis | 57 | wife | — | Greece |
| 36 | Zeigfrid Gutterman | 44 | head | Attendant | Illinois |
| 37 | Adele @ Gutterman | 30 | wife | — | Illinois |
| 38 | Mary Lou Gutterman | 10 | daughter | — | Illinois |
| 39 | Joseph Gutterman | 4 | son | — | Illinois |
| 40 | Agnes Gutterman | 3 | daughter | — | 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)