JI
James Irwin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this James Irwin across the 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 6-person household.
Age 11
b. ~1929
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Irwin |
| Given Name | James T. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Ames |
| 1935 Residence (County) | Story |
| Additional Details | |
| Highest Grade | S 6 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1929 |
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 |
|---|---|---|---|---|
| Mary Irwin | Spouse | — | 38 | ~1902 |
| Thomas Irwin | Son | — | 8 | ~1932 |
| James Irwin | Son | — | 11 | ~1929 |
| Thomas Irwin | Head | — | 37 | ~1903 |
| Bernard Irwin | Son | — | 6 | ~1934 |
| Claire Irwin | Daughter | — | 14 | ~1926 |
Census Appearances
1930
Polk, Iowa
Son, age
Polk, Iowa · implied b. ~1930 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Irwin |
| Given Name | James C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Son, age 11
Polk-County, Iowa · implied b. ~1929 — 6 household members
| Surname | Irwin |
| Given Name | James T. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Ames |
| 1935 Residence (County) | Story |
| Highest Grade | S 6 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 11 · b. ~1929 · Iowa
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Sibling
Claire Irwin
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernard Irwin
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Irwin
Sibling · 1940 · age 8
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 — Polk-County, Iowa
Open full size
1940 US Federal Census — Polk-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01196-00261)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Leroy Kim West | 6 | Son | — | Iowa |
| 2 | Earl W. Bryant | 27 | Head | Laborer | Iowa |
| 3 | Ernestine Bryant | 27 | Wife | Maid | Iowa |
| 4 | Thomas R. Bryant | 9 | Son | — | Iowa |
| 5 | Curtis E. Bryant | 6 | Son | — | Iowa |
| 6 | Dolores A. Bryant | 5 | Daughter | — | Iowa |
| 7 | David J. Bryant | 1 | Son | — | Iowa |
| 8 | Thomas F. Irwin | 37 | Head | Driver Oil Truck | Oklahoma |
| 9 | Mary A. Irwin | 38 | Wife | — | Iowa |
| 10 | Claire F. Irwin | 14 | Daughter | — | Iowa |
| 11 | James T. Irwin THIS PERSON | 11 | Son | — | Iowa |
| 12 | Thomas J. Irwin | 8 | Son | — | Iowa |
| 13 | Bernard Irwin | 6 | Son | — | Iowa |
| 14 | Roy A. Chapman | 38 | Head | Clerical Off. | Iowa |
| 15 | Elsie P. Chapman | 34 | Wife | — | Missouri |
| 16 | Robert A. Chapman | 7 | Son | — | Missouri |
| 17 | Alice L. Chapman | 2 | Daughter | — | Iowa |
| 18 | James F. Olds | 54 | Head | Foreman | New York |
| 19 | Gertrude Olds | 53 | Wife | — | Iowa |
| 20 | James Jr. Olds | 21 | Son | Salesman | Iowa |
| 21 | Carl G. Aspengren | 32 | Head | Carpenter | Sweden |
| 22 | Selma Aspengren | 29 | Wife | Stenographer | Iowa |
| 23 | Harold A. Walter | 35 | Head | Shipping Clk. | Iowa |
| 24 | Cecelia M. Walter | 34 | Wife | Saleswoman | Iowa |
| 25 | Edna Walter | 60 | Mother | Sorter-Marker | West Virginia |
| 26 | Hugh L. Gibson | 32 | Head | Shop Clk. | Iowa |
| 27 | Bernice Gibson | 33 | Wife | — | Iowa |
| 28 | Carol Gibson | 7 | Daughter | — | Iowa |
| 29 | Hugh Gibson | 5 | Son | — | Iowa |
| 30 | Judith Gibson | 1 | Daughter | — | Iowa |
| 31 | Andrew C. Brady | 82 | Head | — | New Jersey |
| 32 | Elizabeth Brady | 78 | Wife | — | Wisconsin |
| 33 | T. Joseph Deford | 27 | Head | Knitter | Iowa |
| 34 | Hazel Deford | 29 | Wife | — | Iowa |
| 35 | Max D. Beckman | 41 | Head | Tank Wagon Dr. | Iowa |
| 36 | Eva Beckman | 40 | Wife | Cashier | Iowa |
| 37 | Morris Malcolm Nutt | 57 | Head | Clerk | Iowa |
| 38 | Elizabeth Ann Nutt | 56 | Wife | — | Illinois |
| 39 | Frank W. Cavender | 41 | Head | General Manager | Iowa |
| 40 | Hazel Cavender | 44 | Wife | Clerical | Iowa |
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)