JH
John Hamilton — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Hamilton across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Ellen & Helen — first a head (b.~1910), then head of a 3-person household.
Age 30
b. ~1910
Male
Head
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Hamilton |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Cambridge |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Lumper |
| Industry | Transportation |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1000 |
| Highest Grade | Hs 3 |
| 1935 Residence | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Lumper |
| Township / Ward | Somerville |
| Est. Birth Year | ~1910 |
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 |
|---|---|---|---|---|
| Joan Hamilton | Daughter | — | 2 | ~1938 |
| John Hamilton | Head | — | 30 | ~1910 |
| Lilian Hamilton | Spouse | — | 31 | ~1909 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 9
Middlesex, Massachusetts · implied b. ~1911 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hamilton |
| Given Name | John H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 19
Middlesex, Massachusetts · implied b. ~1911 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hamilton |
| Given Name | John H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Machinist |
| Industry | Tool mfg. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Head, age 30
Middlesex-County, Massachusetts · implied b. ~1910 — 3 household members
| Surname | Hamilton |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Cambridge |
| 1935 Residence (County) | Middlesex |
| Occupation | Lumper |
| Industry | Transportation |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1000 |
| Highest Grade | Hs 3 |
| 1935 Residence | Massachusetts |
| 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 John Hamilton across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Ellen Hamilton (~0.92 confidence) and mother Helen Hamilton (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Ellen Hamilton
b. ~1873
Source mother
● Household
· direct · ~0.92
Mother
Helen Hamilton
b. ~1879
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Hamilton
Head · 1940 · age 30 · b. ~1910 · Massachusetts
★ You are viewing this record
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-t0627-01702-00565)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Hamilton THIS PERSON | 30 | Head | Lumper | Massachusetts |
| 2 | Lilian Hamilton | 31 | Wife | — | Massachusetts |
| 3 | Joan Hamilton | 2 | Daughter | — | Massachusetts |
| 4 | Irene Estrella | 50 | Head | — | Portugal |
| 5 | Joseph Estrella | 30 | Son | Shipper | Portugal |
| 6 | Nathalie Estrella | 26 | Daughter | — | Portugal |
| 7 | Teresa Estrella | 15 | Daughter | — | Massachusetts |
| 8 | John Doucette | 25 | Head | Asst. Manager | Canada-Eng |
| 9 | Bernice Doucette | 21 | Wife | — | Massachusetts |
| 10 | Eleanor Doucette | 1 | Daughter | — | Massachusetts |
| 11 | Alfred Medoris | 24 | Head | Cabinet Maker | Massachusetts |
| 12 | Beatrice Medoris | 19 | Wife | — | Massachusetts |
| 13 | Alfred Medoris | 0 | Son | — | Massachusetts |
| 14 | Nick Carrassia | 24 | Head | Truck Driver | Massachusetts |
| 15 | Eleanor Carrassia | 21 | Wife | — | Massachusetts |
| 16 | Leroy Carrassia | 3 | Son | — | Massachusetts |
| 17 | Josephine Carrassia | 0 | Daughter | — | Massachusetts |
| 18 | Nicholas Dever | 27 | Head | Laborer | Massachusetts |
| 19 | Margaret Dever | 24 | Wife | — | Massachusetts |
| 20 | Ruth Dever | 0 | Daughter | — | Massachusetts |
| 21 | Leo Bannister | 37 | Head | Painter | Massachusetts |
| 22 | Madeline Bannister | 35 | Wife | Machine Oper | Massachusetts |
| 23 | Madelyn Bannister | 12 | Daughter | — | Massachusetts |
| 24 | John Dorothy | 27 | Head | Laborer | Massachusetts |
| 25 | Dorothy Dorothy | 22 | Wife | — | Massachusetts |
| 26 | Shirley Dorothy | 4 | Daughter | — | Massachusetts |
| 27 | Virginia Dorothy | 2 | Daughter | — | Massachusetts |
| 28 | Fannie Stewart | 53 | Head | — | Canada-Eng |
| 29 | Margaret Stewart | 30 | Daughter | Ironer | Massachusetts |
| 30 | Fred Stewart | 28 | Son | Laborer | Massachusetts |
| 31 | Gilbert Stewart | 24 | Son | Laborer | Massachusetts |
| 32 | Christina Stewart | 20 | Daughter | — | Massachusetts |
| 33 | Howard Stewart | 17 | Son | Bus Boy | Massachusetts |
| 34 | George Stewart | 16 | Son | — | Massachusetts |
| 35 | James V. Moran | 27 | Head | Truck Driver | Massachusetts |
| 36 | Helen Moran | 34 | Wife | — | Massachusetts |
| 37 | James Moran | 12 | Son | — | Massachusetts |
| 38 | Robert Moran | 12 | Son | — | Massachusetts |
| 39 | Walter Moran | 11 | Son | — | Massachusetts |
| 40 | Patricia Moran | 7 | Daughter | — | Massachusetts |
Pedigree Summary
John
Gen 1 · 2 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)