JI
John Irwin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Irwin across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1922), then head of a 5-person household.
Age 18
b. ~1922
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Irwin |
| Given Name | John E. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H 3 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1922 |
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 |
|---|---|---|---|---|
| John Irwin | Son | — | 18 | ~1922 |
| James Irwin | Son | — | 13 | ~1927 |
| Janet Irwin | Daughter | — | 21 | ~1919 |
| Nancy Irwin | Daughter | — | 20 | ~1920 |
| Janet Irwin | Head | — | 47 | ~1893 |
Census Appearances
1930
Cook, Illinois
Son, age 7
Cook, Illinois · implied b. ~1923 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Irwin |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 18
Cook-County, Illinois · implied b. ~1922 — 5 household members
| Surname | Irwin |
| Given Name | John E. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Income (1939) | 0 |
| Highest Grade | H 3 |
| 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 Irwin across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Irwin
Son · 1940 · age 18 · b. ~1922 · Illinois
★ You are viewing this record
Sibling
Janet Irwin
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nancy Irwin
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Irwin
Sibling · 1940 · age 13
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-t0627-00934-00216)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Joseph Lofchie | 53 | Head | Own Business | Russia |
| 2 | Mathilda Lofchie | 45 | Wife | — | Germany |
| 3 | Florence Lofchie | 17 | Daughter | — | New York |
| 4 | Vivian Lofchie | 15 | Daughter | — | New York |
| 5 | John F. Evans | 30 | Head | Analyst | New York |
| 6 | Priscilla Evans | 27 | Wife | — | Illinois |
| 7 | John F. Jr. Evans | 2 | Son | — | Illinois |
| 8 | Frances Maloney | 18 | Maid | Maid | Illinois |
| 9 | Arthur L. Waldner | 45 | Head | Salesman | Hungary |
| 10 | Henrietta Waldner | 45 | Wife | — | New York |
| 11 | Joseph A. Waldner | 22 | Son | Salesman | Illinois |
| 12 | Enid S. Waldner | 16 | Daughter | — | Illinois |
| 13 | Sol Ellis | 60 | Head | Owner | Russia |
| 14 | Minnie Ellis | 59 | Wife | Housewife | Russia |
| 15 | Beatrice Pattinson | 26 | Daughter | — | Illinois |
| 16 | Floyd Pattinson | 1 | Grandchild | — | Illinois |
| 17 | Samuel S. Zardo | 36 | Head | Manager And Owner | Illinois |
| 18 | Ruth W. Zardo | 36 | Wife | — | Illinois |
| 19 | Joan W. Zardo | 8 | Daughter | — | Illinois |
| 20 | Lenore Shaffer | 18 | Maid | Maid | Illinois |
| 21 | Abe Stillman | 58 | Head | Owner | Russia |
| 22 | Anna Stillman | 56 | Wife | — | Wisconsin |
| 23 | Ruth Stillman | 26 | Daughter | Saleslady | Illinois |
| 24 | Herbert Stillman | 21 | Son | Truck Driver | Illinois |
| 25 | Rose Blody | 46 | Sister-in-law | — | Wisconsin |
| 26 | Frank J. Speck | 34 | Head | Packer-Self | Illinois |
| 27 | Rose D. Speck | 35 | Wife | — | Illinois |
| 28 | Janet H. Irwin | 47 | Head | — | Illinois |
| 29 | Janet E. Irwin | 21 | Daughter | Stenographer | Illinois |
| 30 | Nancy Irwin | 20 | Daughter | Stenographer | Illinois |
| 31 | John E. Jr. Irwin THIS PERSON | 18 | Son | — | Illinois |
| 32 | James C. Irwin | 13 | Son | — | Illinois |
| 33 | Dorothy Statson | 39 | Head | — | Illinois |
| 34 | Muriel Statson | 18 | Daughter | — | Illinois |
| 35 | John B. Statson | 12 | Son | — | Illinois |
| 36 | James H. Hampen | 53 | Head | Sales Manager | Indiana |
| 37 | Helen D. Hampen | 49 | Wife | — | Indiana |
| 38 | Thos. H. Bodfish | 24 | Head | Sec. And Treasurer | Ohio |
| 39 | Jeannette Bodfish | 26 | Wife | — | New York |
| 40 | Arthur V. G. Bodfish | 20 | Brother | Clerical | Ohio |
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)