JI
John Irwin — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Irwin across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents James & Frances — first a son (b.~1904), then head of a 3-person household.
Age 36
b. ~1904
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Irwin |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | City of Newton |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Salesman |
| Industry | Office Equip. |
| Class of Worker | PW |
| Hours Worked | 54 |
| Income (1939) | 1500 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Salesman |
| Township / Ward | City Of Newton |
| Est. Birth Year | ~1904 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Robert Irwin | Son | — | 41 | ~1899 |
| Frances Irwin | Head | — | 68 | ~1872 |
| John Irwin | Son | — | 36 | ~1904 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 17
Middlesex, Massachusetts · implied b. ~1903 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Irwin |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Middlesex, Massachusetts
Son, age 27
Middlesex, Massachusetts · implied b. ~1903 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Irwin |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | New York |
| Age at First Marriage | 27 |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Salesman |
| Industry | Distributing Machine |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Middlesex-County, Massachusetts
Son, age 36
Middlesex-County, Massachusetts · implied b. ~1904 — 3 household members
| Surname | Irwin |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | City of Newton |
| 1935 Residence (County) | Middlesex |
| Occupation | Salesman |
| Industry | Office Equip. |
| Class of Worker | PW |
| Hours Worked | 54 |
| Income (1939) | 1500 |
| Highest Grade | H-4 |
| 1935 Residence | Same house |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Irwin (~0.92 confidence) and mother Frances Irwin (~0.92 confidence) and mother Frances Irwin (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Irwin
b. ~1869
Source father
● Household
· direct · ~0.92
Mother
Frances Irwin
b. ~1878
Source mother
● Household
· direct · ~0.92
Mother
Frances Irwin
b. ~1872
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Irwin
Son · 1940 · age 36 · b. ~1904 · Massachusetts
★ You are viewing this record
Sibling
Robert Irwin
Sibling · 1940 · age 41
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-t0627-01614-00440)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Albert A. Vooris | 50 | Head | Car Inspector | New York |
| 2 | Laura M. Vooris | 45 | Wife | — | Russia |
| 3 | Frances S. Irwin | 68 | Head | — | Penna |
| 4 | Robert M. Irwin | 41 | Son | Asst. Mgr. | New York |
| 5 | John Irwin THIS PERSON | 36 | Son | Salesman | New York |
| 6 | Herbert H. Walley | 26 | Head | Mech. Engineer | Mass |
| 7 | Eunice W. Walley | 25 | Wife | Stenographer | Mass |
| 8 | Marywell S. Libby | 29 | Head | Asst. Physicist | New York |
| 9 | Cherilla W. Libby | 63 | Mother | — | Missouri |
| 10 | Richard P. Mcmillan | 50 | Head | Real Estate | West Indies |
| 11 | Helene S. Mcmillan | 46 | Wife | — | Mass |
| 12 | Marjorie H. Mcmillan | 21 | Daughter | Supervisor | Mass |
| 13 | Fred C. Mcmillan | 18 | Son | Shipping Clerk | Mass |
| 14 | Hugh B. Mcdougall | 38 | Head | Foreman Carpenter | Canada English |
| 15 | Catherine Mcdougall | 31 | Wife | Clerk-Office | Canada English |
| 16 | Elton B. Gass | 32 | Head | Meat Cutter | Mass |
| 17 | Winifred E. Gass | 29 | Wife | — | Mass |
| 18 | Serena S. Butler | 79 | Head | Keeper | Maine |
| 19 | Josephine B. Butler | 40 | Daughter | — | Mass |
| 20 | Anna J. Wilcox | 75 | Lodger | — | Mass |
| 21 | Minnie Colegrove | 78 | Lodger | — | New York |
| 22 | Winianne Favorite | 46 | Lodger | Teacher | Illinois |
| 23 | Priscilla Kingman | 25 | Lodger | Secretary | Mass |
| 24 | Bradford W. Dyer | 25 | Lodger | Spotter-Clng. | Mass |
| 25 | Delmar Jones | 31 | Lodger | Food Broker | New Hampshire |
| 26 | Minnie Davidson | 80 | Lodger | — | Mass |
| 27 | Arthur D. Brown | 55 | Head | Baker | New York |
| 28 | Ann M. W. Brown | 42 | Wife | — | South Carolina |
| 29 | Arthur D. Brown | 6 | Son | — | Mass |
| 30 | Edward H. Little | 74 | Lodger | Executive | Maine |
| 31 | Jean V. Latimer | 50 | Lodger | Educator | South Carolina |
| 32 | Frank M. Stetson | 82 | Lodger | — | Mass |
| 33 | Geraldine St. George | 20 | Servant | General Maid | Mass |
| 34 | Helen O. Pratt | 60 | Head | Registrar | Canada English |
| 35 | Sally Steel | 45 | Lodger | Practical Nurse | Canada English |
| 36 | Mary Louise Holden | 70 | Lodger | — | Ohio |
| 37 | William S. Bartley | 31 | Head | Mail Order Business | Mass |
| 38 | Genevieve W. Bartley | 28 | Wife | Clerk-Office | New Hampshire |
| 39 | Claire Louise Bartley | 3 | Daughter | — | Mass |
| 40 | Eugene F. Storns | 60 | Head | Bank Exam. | Mass |
Pedigree Summary
John + 1 sibling
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
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)