JI
John Irwin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · New-Castle-County, Delaware
Our Model Tree links this John Irwin across the 1930 and 1940 US Censuses in New-Castle-County, Delaware (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 5-person household.
Age 11
b. ~1929
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | New-Castle-County, Delaware |
| Surname | Irwin |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Newark Town |
| 1935 Residence (County) | New Castle |
| Additional Details | |
| Highest Grade | G-4 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Newark Town |
| 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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Irwin | Son | — | 11 | ~1929 |
| George Irwin | Son | — | 2 | ~1938 |
| Charles Irwin | Son | — | 14 | ~1926 |
| Harry Irwin | Head | — | 45 | ~1895 |
| Beatrice Irwin | Daughter | — | 8 | ~1932 |
Census Appearances
1930
New Castle, …
Son, age 1
New Castle, Delaware · implied b. ~1929 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Irwin |
| Given Name | John Floyd |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
New-Castle-County, Delaware
Son, age 11
New-Castle-County, Delaware · implied b. ~1929 — 5 household members
| Surname | Irwin |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Newark Town |
| 1935 Residence (County) | New Castle |
| Highest Grade | G-4 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
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 11 · b. ~1929 · Delaware
★ You are viewing this record
Sibling
George Irwin
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Irwin
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Beatrice 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 — New-Castle-County, Delaware
Open full size
1940 US Federal Census — New-Castle-County, Delaware
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00546-00180)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Harry Irwin | 45 | Head | S | Pennsylvania |
| 2 | Charles Irwin | 14 | Son | — | Pennsylvania |
| 3 | John Irwin THIS PERSON | 11 | Son | — | Maryland |
| 4 | Beatrice Irwin | 8 | Daughter | — | Maryland |
| 5 | George Irwin | 2 | Son | — | Delaware |
| 6 | Ida M. Williams | 70 | Head | — | Delaware |
| 7 | Jenny Williams | 35 | Daughter | — | Delaware |
| 8 | John Williams | 34 | Son | Street Cleaner | Delaware |
| 9 | Raymond Williams | 15 | Grandson | — | Delaware |
| 10 | Irving Lloyd | 45 | Head | Cook Churner | Delaware |
| 11 | Carrie Lloyd | 39 | Wife | — | New Jersey |
| 12 | Helen Lloyd | 2 | Daughter | — | Delaware |
| 13 | Virginia Van Meter | 13 | Step daughter | — | New Jersey |
| 14 | Thomas Johnson | 58 | Lodger | Basket Maker | Maryland |
| 15 | Edward Dill | 29 | Head | New Worker | Maryland |
| 16 | Amy Dill | 27 | Wife | — | Delaware |
| 17 | Edward Dill | 11 | Son | — | Delaware |
| 18 | Thelma Dill | 6 | Daughter | — | Delaware |
| 19 | Betty Dill | 4 | Daughter | — | Delaware |
| 20 | Ronald Duvois | 28 | Head | Press Operator | Delaware |
| 21 | Julia Duvois | 25 | Wife | Examiner | Pennsylvania |
| 22 | Ronald Duvois | 6 | Son | — | Delaware |
| 23 | Richard Duvois | 5 | Son | — | Delaware |
| 24 | William Slagley | 37 | Head | Tube Maker | Maryland |
| 25 | Harry Taylor | 39 | Lodger | Tube Maker | Pennsylvania |
| 26 | Isaac Sharp | 59 | Head | Steam Crane Operator | Pennsylvania |
| 27 | Mildred Sharp | 26 | Wife | — | Delaware |
| 28 | Charles Sharp | 8 | Son | — | Delaware |
| 29 | Caroline Sharp | 7 | Daughter | — | Delaware |
| 30 | Eugene Sharp | 5 | Son | — | Delaware |
| 31 | Laura Chris | 50 | Mother-in-law | — | Delaware |
| 32 | Beatrice Chris | 25 | Sister-in-law | New Worker | Delaware |
| 33 | Clarence Grant | 64 | Head | — | Maryland |
| 34 | Blanche Grant | 61 | Wife | — | Delaware |
| 35 | Harry Crill | 31 | Son-in-law | Beating Room | Delaware |
| 36 | Mildred Crill | 24 | Daughter | — | Delaware |
| 37 | Thomas Freeman | 63 | Lodger | Dry House Worker | Maryland |
| 38 | Sarah Marshman | 73 | Head | Novelty Work | Delaware |
| 39 | Emory Hess | 22 | Head | Legger | Pennsylvania |
| 40 | Loretta Hess | 19 | Wife | Pairer | Pennsylvania |
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)