JI
James Irwin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Marion-County, Indiana
Our Model Tree links this James Irwin across the 1930 and 1940 US Censuses in Marion-County, Indiana (XGBoost, ~Confirmed) — first a son (b.~1919), then head of a 5-person household.
Age 21
b. ~1919
Male
Son
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marion-County, Indiana |
| Surname | Irwin |
| Given Name | James E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Additional Details | |
| Occupation | Stock Boy |
| Industry | Wholesale Bakery |
| Class of Worker | PW |
| Hours Worked | 25 |
| Income (1939) | 480 |
| Highest Grade | C 2 |
| 1935 Residence | Same house |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Occupation | Stock Boy |
| Township / Ward | Indianapolis |
| Est. Birth Year | ~1919 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| James Irwin | Son | — | 21 | ~1919 |
| Mayme Irwin | Spouse | — | 50 | ~1890 |
| Anna Hartman | Other | — | 48 | ~1892 |
| Emmett Irwin | Head | — | 50 | ~1890 |
| Elizabeth Irwin | Daughter | — | 18 | ~1922 |
Census Appearances
1930
Marion, Indiana
Son, age 11
Marion, Indiana · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Irwin |
| Given Name | James E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Indiana |
| Can Read/Write | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Marion-County, Indiana
Son, age 21
Marion-County, Indiana · implied b. ~1919 — 5 household members
| Surname | Irwin |
| Given Name | James E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Indianapolis |
| 1935 Residence (County) | Marion |
| Occupation | Stock Boy |
| Industry | Wholesale Bakery |
| Class of Worker | PW |
| Hours Worked | 25 |
| Income (1939) | 480 |
| Highest Grade | C 2 |
| 1935 Residence | Same house |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 21 · b. ~1919 · Indiana
★ You are viewing this record
Sibling
Elizabeth Irwin
Sibling · 1940 · age 18
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 — Marion-County, Indiana
Open full size
1940 US Federal Census — Marion-County, Indiana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01130-00134)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marie Johnston | 42 | Wife | — | Indiana |
| 2 | Robert Johnston | 15 | Son | — | Indiana |
| 3 | Marilynn Johnston | 9 | Daughter | — | Ohio |
| 4 | Carl Lawson | 56 | Head | — | Indiana |
| 5 | Edith Lawson | 54 | Wife | — | Indiana |
| 6 | Marjorie Lawson | 27 | Daughter | Senior Visitor | Indiana |
| 7 | Mary Edith Lawson | 19 | Daughter | — | Indiana |
| 8 | Ben W. Thuneman | 57 | Head | Night Watchman | Indiana |
| 9 | Clem F. Thuneman | 55 | Brother | Manager Owner | Indiana |
| 10 | Caroline J. Thuneman | 50 | Sister | — | Indiana |
| 11 | Elizabeth A. Thuneman | 40 | Sister | Telegraph Operator | Indiana |
| 12 | Harry B. Smith | 36 | Head | Electrical Engineer | Illinois |
| 13 | Ruth D. Smith | 32 | Wife | — | Michigan |
| 14 | Katherine Smith | 7 | Daughter | — | Michigan |
| 15 | Harry Smith | 4 | Son | — | Indiana |
| 16 | William Smith | 1 | Son | — | Indiana |
| 17 | Martin B. Sr. Hall | 68 | Head | Broker | Indiana |
| 18 | Ora S. Hall | 64 | Wife | — | Indiana |
| 19 | Martin B. Jr. Hall | 33 | Son | Adjuster | Indiana |
| 20 | Lucille Hall | 30 | Daughter-in-law | Telegraph Operator | Indiana |
| 21 | Barbara Hall | 8 | Granddaughter | — | Indiana |
| 22 | Robert S. Reed | 39 | Head | Asst Supt | Indiana |
| 23 | Ruth Reed | 40 | Wife | — | Indiana |
| 24 | Robert Jr. Reed | 14 | Son | — | Indiana |
| 25 | Alfred A. Reed | 12 | Son | — | Indiana |
| 26 | Mary Joe Reed | 7 | Daughter | — | Indiana |
| 27 | Emmett M. Irwin | 50 | Head | Broker | Kentucky |
| 28 | Mayme Irwin | 50 | Wife | — | Indiana |
| 29 | James E. Irwin THIS PERSON | 21 | Son | Stock Boy | Indiana |
| 30 | Elizabeth Ann Irwin | 18 | Daughter | — | Indiana |
| 31 | Anna A. Hartman | 48 | Mother-in-law | Operator | Indiana |
| 32 | Jas D. Branaman | 64 | Head | Manager | Indiana |
| 33 | Myrtle Branaman | 54 | Wife | — | Indiana |
| 34 | Here Ends South 8 And Begins Block 9 | None | — | — | — |
| 35 | Ed Clinton | 56 | Head | Supervisor | Indiana |
| 36 | Ethel Clinton | 53 | Wife | — | Indiana |
| 37 | Martin M. Clinton | 18 | Son | Publicity Man | Indiana |
| 38 | Mitchell S. Harber | 85 | Head | Retired Minister | Indiana |
| 39 | Emma F. Harber | 82 | Wife | — | Indiana |
| 40 | J. F. Dwayne | 52 | Head | Physician & Surgeon | Indiana |
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)