JK
John Kerr — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Kerr across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1917), then head of a 5-person household.
Age 23
b. ~1917
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Kerr |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | CHICAGO-CITY |
| 1935 Residence (County) | COOK |
| Additional Details | |
| Occupation | Laborer |
| Class of Worker | PW |
| Hours Worked | 38 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Laborer |
| Township / Ward | Chicagocity |
| Est. Birth Year | ~1917 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| David Kerr | Head | — | 57 | ~1883 |
| Virginia Kerr | Daughter | — | 26 | ~1914 |
| Helen Kerr | Daughter | — | 22 | ~1918 |
| John Kerr | Son | — | 23 | ~1917 |
| Jennie Kerr | Spouse | — | 55 | ~1885 |
Census Appearances
1930
Cook, Illinois
Son, age 13
Cook, Illinois · implied b. ~1917 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kers |
| Given Name | John A. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 23
Cook-County, Illinois · implied b. ~1917 — 5 household members
| Surname | Kerr |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | CHICAGO-CITY |
| 1935 Residence (County) | COOK |
| Occupation | Laborer |
| Class of Worker | PW |
| Hours Worked | 38 |
| Highest Grade | Hs 4 |
| 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 Kerr across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Kerr
Son · 1940 · age 23 · b. ~1917 · Illinois
★ You are viewing this record
Sibling
Virginia Kerr
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Kerr
Sibling · 1940 · age 22
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-t0627-01000-00645)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Charles Dreher | 65 | Head | Wood Working Machine Hand | Germany |
| 42 | Helen Dreher | 65 | Wife | — | Germany |
| 43 | Arthur B. Molligan | 44 | Head | Route Salesman | Illinois |
| 44 | Catherine Molligan | 42 | Wife | — | Illinois |
| 45 | Rosemary Molligan | 10 | Daughter | — | Illinois |
| 46 | Catherine Molligan | 8 | Daughter | — | Illinois |
| 47 | Arthur B. Jr. Molligan | 3 | Son | — | Illinois |
| 48 | Hugo P. Witte | 50 | Head | Proprietor | Illinois |
| 49 | Marie A. Witte | 45 | Wife | — | Illinois |
| 50 | Lorraine M. Witte | 21 | Daughter | School Clerk | Illinois |
| 51 | Richard J. Witte | 19 | Son | Laborer | Illinois |
| 52 | Florence C. Witte | 15 | Daughter | — | Illinois |
| 53 | Phillip Foethmann | 57 | Head | Yard Foreman | Illinois |
| 54 | Caroline Foethmann | 50 | Wife | — | Illinois |
| 55 | Barbara Lee | 80 | Mother | — | Illinois |
| 56 | Robert Lee | 7 | Lodger | — | Illinois |
| 57 | Thomas Newton | 66 | Head | Civil Engineer | Michigan |
| 58 | Matilda Newton | 69 | Wife | — | Wisconsin |
| 59 | Marcella Newton | 31 | Daughter | — | Illinois |
| 60 | Virginia Newton | 25 | Daughter | Stenographer | Illinois |
| 61 | Thomas E. Newton | 20 | Son | Laborer | Illinois |
| 62 | Patricia Newton | 16 | Daughter | — | Illinois |
| 63 | Francis J. Kalas | 55 | Head | Mail Carrier | Illinois |
| 64 | Johanna Kalas | 55 | Wife | — | Illinois |
| 65 | Dolores Kalas | 25 | Daughter | Cashier | Illinois |
| 66 | Thomas Kalas | 23 | Son | Laborer | Illinois |
| 67 | Arthur Kalas | 18 | Son | Office Boy | Illinois |
| 68 | Gerald Kalas | 15 | Son | — | Illinois |
| 69 | Charles O. Kahl | 54 | Head | Shipping Clerk | Illinois |
| 70 | Rose Kahl | 57 | Wife | — | Illinois |
| 71 | Arthur Kahl | 27 | Son | Mail Clerk | Illinois |
| 72 | Doris Kahl | 10 | Daughter | — | Illinois |
| 73 | Stanley Mroz | 71 | Head | Mechanic | Poland |
| 74 | Antoinette Mroz | 70 | Wife | — | Poland |
| 75 | Marie Mroz | 39 | Daughter | Social (Civil Serv) Worker | Illinois |
| 76 | David F. Kerr | 57 | Head | Police Officer | Illinois |
| 77 | Jennie Kerr | 55 | Wife | — | Illinois |
| 78 | Virginia Kerr | 26 | Daughter | — | Illinois |
| 79 | John Kerr THIS PERSON | 23 | Son | Laborer | Illinois |
| 80 | Helen Kerr | 22 | Daughter | Telephone Operator | 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)