JK
John Kirby — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Kirby across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1894), then head of a 7-person household.
Age 46
b. ~1894
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Kirby |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | laborer |
| Industry | State Park |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 988 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Laborer |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1894 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Jane Kirby | Daughter | — | 2 | ~1938 |
| James Kirby | Son | — | 4 | ~1936 |
| John Kirby | Head | — | 46 | ~1894 |
| Kenneth Kirby | Son | — | 9 | ~1931 |
| Joan Kirby | Daughter | — | 2 | ~1938 |
| Margaret Kirby | Daughter | — | 16 | ~1924 |
| Florence Kirby | Spouse | — | 39 | ~1901 |
Census Appearances
1930
Cook, Illinois
Son, age 38
Cook, Illinois · implied b. ~1892 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kirby |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 38 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Tennessee |
| Occupation | Painter decorator |
| Industry | House |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 46
Cook-County, Illinois · implied b. ~1894 — 7 household members
| Surname | Kirby |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | laborer |
| Industry | State Park |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 988 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| 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 John Kirby across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Kirby
Head · 1940 · age 46 · b. ~1894 · Illinois
★ You are viewing this record
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-t0627-01023-00966)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Nicholas Theodore | 30 | Son | Insurance Salesman | Illinois |
| 2 | Anna Mae Theodore | 28 | Wife | File Clerk | Greece |
| 3 | Gus Theodore | 50 | Brother | Salesman | Greece |
| 4 | John Kirby THIS PERSON | 46 | Head | Laborer | Illinois |
| 5 | Florence Kirby | 39 | Wife | — | Illinois |
| 6 | Margaret Kirby | 16 | Daughter | — | Illinois |
| 7 | Kenneth Donald Kirby | 9 | Son | — | Illinois |
| 8 | James Kirby | 4 | Son | — | Illinois |
| 9 | Joan Kirby | 2 | Daughter | — | Illinois |
| 10 | Jane Kirby | 2 | Daughter | — | Illinois |
| 11 | Roland Drew | 49 | Head | Beveragesman | Illinois |
| 12 | Katherine Drew | 57 | Wife | — | Illinois |
| 13 | James Drew | 22 | Son | Chauffeur | Illinois |
| 14 | Annabelle Drew | 20 | Daughter | — | Illinois |
| 15 | Roland Drew | 17 | Son | — | Illinois |
| 16 | Edward Drew | 15 | Son | — | Illinois |
| 17 | Rosemary Drew | 12 | Daughter | — | Illinois |
| 18 | John Menefee | 59 | Head | Janitor | Missouri |
| 19 | Cora Menefee | 60 | Wife | — | Canada |
| 20 | Ted Carro | 26 | Son-in-law | Truck Driver | Illinois |
| 21 | Beatrice Carro | 24 | Daughter | — | Indiana |
| 22 | Emil Barres | 52 | Head | Drug Store Proprietor | Germany |
| 23 | Frances Barres | 49 | Wife | — | Illinois |
| 24 | Lucille Barres | 17 | Daughter | — | Illinois |
| 25 | Steve Zurich | 42 | Head | Barber | Czecho-Slovakia |
| 26 | Mary Zurich | 39 | Wife | — | Illinois |
| 27 | June Zurich | 20 | Daughter | Record Clerk | Illinois |
| 28 | Stephen Zurich | 18 | Son | Delivery Boy | Illinois |
| 29 | John Zurich | 16 | Son | — | Illinois |
| 30 | Mary Jane Zurich | 14 | Daughter | — | Illinois |
| 31 | Thomas Zurich | 11 | Son | — | Illinois |
| 32 | Albert Plodzien | 52 | Head | Florist | Austria |
| 33 | Mamie Plodzien | 47 | Wife | — | Illinois |
| 34 | Antoinette Plodzien | 27 | Daughter | Stenographer | Illinois |
| 35 | Joseph Plodzien | 15 | Son | — | Illinois |
| 36 | John Plodzien | 4 | Son | — | Illinois |
| 37 | Ignatius Kielpinski | 78 | Father-in-law | — | Danzig |
| 38 | Patrick Waldron | 59 | Head | Laborer | Ireland |
| 39 | Nora Waldron | 58 | Wife | — | Ireland |
| 40 | Edward Waldron | 26 | Son | Grocery Clerk | 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)