JR
John Regan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Regan across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 9-person household.
Age 12
b. ~1928
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Regan |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | 6 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| Est. Birth Year | ~1928 |
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 |
|---|---|---|---|---|
| Margaret Regan | Spouse | — | 36 | ~1904 |
| Mary Regan | Daughter | — | 10 | ~1930 |
| Joan Regan | Daughter | — | 5 | ~1935 |
| Dorothy Regan | Daughter | — | 14 | ~1926 |
| James Regan | Son | — | 7 | ~1933 |
| John Regan | Son | — | 12 | ~1928 |
| John Regan | Head | — | 39 | ~1901 |
| Margaret Regan | Daughter | — | 15 | ~1925 |
| Jerome Regan | Son | — | 2 | ~1938 |
Census Appearances
1930
Cook, Illinois
Son, age 2
Cook, Illinois · implied b. ~1928 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Regan |
| Given Name | John Jr. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 12
Cook-County, Illinois · implied b. ~1928 — 9 household members
| Surname | Regan |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Highest Grade | 6 |
| 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 Regan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Regan
Son · 1940 · age 12 · b. ~1928 · Illinois
★ You are viewing this record
Sibling
James Regan
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Regan
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jerome Regan
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Regan
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joan Regan
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Regan
Sibling · 1940 · age 15
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
39 people indexed on this census page (nara:1940:m-t0627-00998-00375)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John Tracy | 29 | Head | Photo-Engraver | Illinois |
| 42 | Hazel Tracy | 27 | Wife | — | Illinois |
| 43 | Richard Tracy | 3 | Son | — | Illinois |
| 44 | Beverly Tracy | 0 | Daughter | — | Illinois |
| 45 | Harold Tracy | 27 | Brother | Salesman | Illinois |
| 46 | Paul Natale | 47 | Head | Salesman | Italy |
| 47 | Ada Natale | 43 | Wife | — | Italy |
| 48 | Peter Natale | 9 | Son | — | Illinois |
| 49 | John Natale | 1 | Son | — | Illinois |
| 50 | Thomas Handley | 43 | Head | Tool Maker | Illinois |
| 51 | Marie Handley | 39 | Wife | — | Illinois |
| 52 | Marilyn Handley | 12 | Daughter | — | Illinois |
| 53 | Jerry Handley | 5 | Son | — | Illinois |
| 54 | John Sullivan | 29 | Head | Electrician | Michigan |
| 55 | Bernice Sullivan | 27 | Wife | Stenographer | Wisconsin |
| 56 | John Jr. Sullivan | 1 | Son | — | Illinois |
| 57 | John M. Regan | 39 | Head | Clerk | Illinois |
| 58 | Margaret Regan | 36 | Wife | — | Illinois |
| 59 | Margaret Regan | 15 | Daughter | — | Illinois |
| 60 | Dorothy Regan | 14 | Daughter | — | Illinois |
| 61 | John Jr. Regan THIS PERSON | 12 | Son | — | Illinois |
| 62 | Mary Regan | 10 | Daughter | — | Illinois |
| 63 | James Regan | 7 | Son | — | Illinois |
| 64 | Joan Regan | 5 | Daughter | — | Illinois |
| 65 | Jerome Regan | 2 | Son | — | Illinois |
| 66 | Ormond Rowland | 37 | Head | Switchboard Operator | Kentucky |
| 67 | Mabel Rowland | 36 | Wife | — | Illinois |
| 68 | Edgar Ehrmann | 39 | Head | Electrician | Illinois |
| 69 | Raymond Ehrmann | 35 | Wife | Typist | Illinois |
| 70 | Robert Ehrmann | 14 | Son | — | Illinois |
| 71 | Elizabeth Matthews | 56 | Mother-in-law | — | Illinois |
| 72 | Earl J. Matthews | 15 | Brother-in-law | — | Illinois |
| 73 | Louis Carroll | 41 | Head | Asst. Controller | Illinois |
| 74 | May Carroll | 40 | Wife | — | Illinois |
| 75 | Leila Carroll | 18 | Daughter | — | Illinois |
| 76 | Richard Carroll | 12 | Son | — | Illinois |
| 77 | Nancy Carroll | 8 | Daughter | — | Illinois |
| 78 | Fred Kaminski | 45 | Head | Plumber | Illinois |
| 79 | Anna Kaminski | 43 | Wife | — | Illinois |
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)