JI
James Irwin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this James Irwin across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1930), then head of a 6-person household.
Age 10
b. ~1930
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Irwin |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago |
| Est. Birth Year | ~1930 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Doris Irwin | Daughter | — | 17 | ~1923 |
| Thomas Irwin | Head | — | 48 | ~1892 |
| James Irwin | Son | — | 10 | ~1930 |
| Augusta Irwin | Spouse | — | 43 | ~1897 |
| Donald Irwin | Son | — | 13 | ~1927 |
| Charles Irwin | Son | — | 15 | ~1925 |
Census Appearances
1930
Cook, Illinois
Son, age 1
Cook, Illinois · implied b. ~1929 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Irwin |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| 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 10
Cook-County, Illinois · implied b. ~1930 — 6 household members
| Surname | Irwin |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Highest Grade | 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 James Irwin across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Irwin
Son · 1940 · age 10 · b. ~1930 · Illinois
★ You are viewing this record
Sibling
Charles Irwin
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Irwin
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Doris Irwin
Sibling · 1940 · age 17
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-t0627-00997-00455)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William Watts | 47 | Brother | Chef | Illinois |
| 2 | Fred Richards | 47 | Head | Milkman | Switzerland |
| 3 | Martha Richards | 42 | Wife | — | Switzerland |
| 4 | Hines Richards | 10 | Son | — | Illinois |
| 5 | Edith Richards | 9 | Daughter | — | Illinois |
| 6 | John Rome | 34 | Head | Draftsman | Illinois |
| 7 | Lillian Rome | 32 | Wife | Hairdresser | Illinois |
| 8 | George Joyce | 44 | Head | — | Iowa |
| 9 | Mary Joyce | 43 | Wife | Stenographer | Illinois |
| 10 | Frances Joyce | 18 | Daughter | Stenographer | Illinois |
| 11 | Rosemary Joyce | 17 | Daughter | — | Illinois |
| 12 | Joan Joyce | 16 | Daughter | — | Illinois |
| 13 | William Melvin | 73 | Head | — | Indiana |
| 14 | Anna Melvin | 64 | Wife | — | Germany |
| 15 | Thomas Irwin | 48 | Head | Elevator Man | Illinois |
| 16 | Augusta Irwin | 43 | Wife | — | Illinois |
| 17 | Doris Irwin | 17 | Daughter | Office Work | Illinois |
| 18 | Charles Irwin | 15 | Son | — | Illinois |
| 19 | Donald Irwin | 13 | Son | — | Illinois |
| 20 | James Irwin THIS PERSON | 10 | Son | — | Illinois |
| 21 | Robert Wittenberg | 27 | Head | Dental Technician | Illinois |
| 22 | Ellen Wittenberg | 24 | Wife | — | Illinois |
| 23 | George Wittenberg | 2 | Son | — | Illinois |
| 24 | Elizabeth Hopkins | 68 | Head | — | Indiana |
| 25 | Clifton Hopkins | 38 | Son | Service Man | Illinois |
| 26 | Walter Iltisck | Itisck | 43 | Head | Plumber | Germany |
| 27 | Magdalen Iltisck | Itisck | 50 | Wife | — | Germany |
| 28 | Charles Bepp | 39 | Head | Tool And Dye Maker | Germany |
| 29 | Geraldine Bepp | 36 | Wife | — | Illinois |
| 30 | Joanne R Bepp | 10 | Daughter | — | Illinois |
| 31 | Priscilla Jane Bepp | 9 | Daughter | — | Illinois |
| 32 | Johanna Castonia | 71 | Mother in law | — | Michigan |
| 33 | Philip Dicker | 53 | Head | Coal, Ice + Mover | Illinois |
| 34 | Lillian Dicker | 49 | Wife | — | Illinois |
| 35 | George Dicker | 25 | Son | Assembler | Illinois |
| 36 | Charles Dicker | 23 | Son | Shipping Clerk | Illinois |
| 37 | Philip Jr. Dicker | 23 | Son | Coal, Ice And Mover | Illinois |
| 38 | Esther Loderburg | 86 | Aunt | — | Sweden |
| 39 | Arthur Perkins | 43 | Head | Conductor | Illinois |
| 40 | Ruth Perkins | 47 | Wife | — | 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)