WI
William Irwin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this William Irwin across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1917), then head of a 5-person household.
Age 23
b. ~1917
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Irwin |
| Given Name | William |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | City of Somerville |
| Additional Details | |
| Occupation | automobile parts |
| Industry | PW |
| Class of Worker | 800 |
| Highest Grade | Hs 1 |
| 1935 Residence | 55 |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Automobile Parts |
| Township / Ward | City Of Somerville |
| Est. Birth Year | ~1917 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| William Irwin | Head | — | 63 | ~1877 |
| Louise Irwin | Spouse | — | 47 | ~1893 |
| James Irwin | Son | — | 20 | ~1920 |
| Eloise Irwin | Daughter | — | 16 | ~1924 |
| William Irwin | Son | — | 23 | ~1917 |
Census Appearances
1930
Middlesex, Massachusetts
Son, age 13
Middlesex, Massachusetts · implied b. ~1917 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Irwin |
| Given Name | William Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | England |
| Mother's Birthplace | Scotland |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 23
Middlesex-County, Massachusetts · implied b. ~1917 — 5 household members
| Surname | Irwin |
| Given Name | William |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | City of Somerville |
| Occupation | automobile parts |
| Industry | PW |
| Class of Worker | 800 |
| Highest Grade | Hs 1 |
| 1935 Residence | 55 |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 William Irwin across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Irwin
Son · 1940 · age 23 · b. ~1917 · Massachusetts
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Sibling
James Irwin
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eloise Irwin
Sibling · 1940 · age 16
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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01702-00852)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Phyllis Merlino | 11 | daughter | — | Massachusetts |
| 42 | John Frederick Merlino | 2 | son | — | Massachusetts |
| 43 | Thomas Demire | 36 | Head | Wpa Arsenal | Massachusetts |
| 44 | Catherine Demire | 34 | wife | — | Massachusetts |
| 45 | Helen Demire | 8 | daughter | — | Massachusetts |
| 46 | Leonard Demire | 1 | son | — | Massachusetts |
| 47 | Manuel Pacheco | 27 | Head | Steamfitter | Massachusetts |
| 48 | Emma Pacheco | 36 | wife | — | Massachusetts |
| 49 | John Pacheco | 15 | son | — | Massachusetts |
| 50 | Donald Pacheco | 12 | son | — | Massachusetts |
| 51 | Gilbert Pacheco | 10 | son | — | Massachusetts |
| 52 | Robert Pacheco | 8 | son | — | Massachusetts |
| 53 | Carole Pacheco | 1 | daughter | — | Massachusetts |
| 54 | William Irwin | 63 | Head | Oil Concern | Canada English |
| 55 | Louise Irwin | 47 | wife | — | Scotland |
| 56 | William Irwin THIS PERSON | 23 | son | Automobile Parts | Massachusetts |
| 57 | James Irwin | 20 | son | Electrotype | Massachusetts |
| 58 | Eloise Irwin | 16 | daughter | — | Massachusetts |
| 59 | Alfredo Simionis | 39 | Head | Warehouse | Massachusetts |
| 60 | Agnes Simionis | 37 | wife | — | Massachusetts |
| 61 | Anthony Simionis | 13 | son | — | Massachusetts |
| 62 | Angus Bregoli | 48 | Head | — | Italy |
| 63 | Alice Bregoli | 27 | daughter | Private Home | Massachusetts |
| 64 | Henry Bregoli | 20 | son | Restaurant | Massachusetts |
| 65 | John Pedroni | 57 | boarder | Owns Account | Italy |
| 66 | Francis Ranno | 25 | Head | Clerk | Massachusetts |
| 67 | Stella Ranno | 21 | wife | Press Operator | Vermont |
| 68 | Deanna Ranno | 4 | daughter | — | Massachusetts |
| 69 | Lao Kee | 27 | Head | Cook | China |
| 70 | Edna Kee | 19 | wife | — | Maine |
| 71 | Catherine Bredeau | 20 | boarder | Waitress | Maine |
| 72 | Anthony Capuano | 46 | Head | Wpa Sewers | Italy |
| 73 | Maria Capuano | 39 | wife | — | Italy |
| 74 | John Capuano | 13 | son | — | Massachusetts |
| 75 | Sylvester Pucjito | 62 | Head | Cabinet Factory | Poland |
| 76 | Edna Pucjito | 56 | wife | — | Poland |
| 77 | Mary Pucjito | 32 | daughter | Candy Factory | Poland |
| 78 | Stanley Pucjito | 27 | son | Retail Market | Poland |
| 79 | Helen Pucjito | 25 | daughter | Variety Store | Massachusetts |
| 80 | Jane Pucjito | 23 | daughter | — | Massachusetts |
Related Census Records
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)