JH
John Hamilton — 1940 US Census Record
Model Tree available1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this John Hamilton across the 1920, 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed), with identified parents Susan & William — first a head (b.~1901), then head of a 8-person household.
Age 39
b. ~1901
Male
Head
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Hamilton |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Occupation | Chief Engineer |
| Industry | Tug Boat |
| Class of Worker | PW |
| Hours Worked | 60 |
| Income (1939) | 1305 |
| Highest Grade | No 6 |
| 1935 Residence | Same House |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Chief Engineer |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1901 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Lillian Hamilton | Daughter | — | 18 | ~1922 |
| John Hamilton | Head | — | 39 | ~1901 |
| Melvin Hamilton | Son | — | 14 | ~1926 |
| John Hamilton | Son | — | 19 | ~1921 |
| Charles Hamilton | Son | — | 3 | ~1937 |
| James Hamilton | Son | — | 17 | ~1923 |
| Benjamin Hamilton | Son | — | 10 | ~1930 |
| Stella Hamilton | Spouse | — | 39 | ~1901 |
Census Appearances
1920
Baltimore, Maryland
Son, age 18
Baltimore, Maryland · implied b. ~1902 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hamilton |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Son, age 29
Baltimore, Maryland · implied b. ~1901 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hamilton |
| Given Name | John W |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Manager |
| Industry | Bowling Alley |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Value / Rent | No |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Head, age 39
Baltimore-City-County, Maryland · implied b. ~1901 — 8 household members
| Surname | Hamilton |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Occupation | Chief Engineer |
| Industry | Tug Boat |
| Class of Worker | PW |
| Hours Worked | 60 |
| Income (1939) | 1305 |
| Highest Grade | No 6 |
| 1935 Residence | Same House |
| 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 Hamilton across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Susan Hamilton (~0.92 confidence) and father William Hamilton (~0.92 confidence) and mother Roswell Hamilton (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Susan Hamilton
b. ~1878
Source mother
● Household
· direct · ~0.92
Father
William Hamilton
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Roswell Hamilton
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Hamilton
Head · 1940 · age 39 · b. ~1901 · Maryland
★ 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 — Baltimore-City-County, Maryland
Open full size
1940 US Federal Census — Baltimore-City-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01508-00218)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Agnes Konieczny | 73 | Wife | — | Poland |
| 2 | Francis Pruitt | 30 | Head | Steam Engineering | Maryland |
| 3 | Margaret Pruitt | 31 | Wife | Book Keeper | Maryland |
| 4 | Martha Pachman | 49 | Head | Presser | Maryland |
| 5 | Grace Jones | 53 | Partner | — | Maryland |
| 6 | Anna Martinson | 62 | Head | — | Norway |
| 7 | Clarence Martinson | 32 | Son | Laborer | Maryland |
| 8 | Oscar Martinson | 30 | Son | — | Maryland |
| 9 | Charles Anderson | 87 | Father | — | Norway |
| 10 | Marion M. Dumbrow | 28 | Head | Cab Driver | Maryland |
| 11 | Clara C. Dumbrow | 26 | Wife | — | Maryland |
| 12 | Marlene G. Dumbrow | 5 | Daughter | — | Maryland |
| 13 | Marion Mrozowski | 34 | Head | Salesman | Maryland |
| 14 | Stella Mrozowski | 35 | Wife | — | Maryland |
| 15 | Rita Mrozowski | 2 | Daughter | — | Maryland |
| 16 | Ignatius Krosniewska | 63 | Head | Laborer | Poland |
| 17 | Lucy Krosniewska | 66 | Wife | — | Poland |
| 18 | Jeanette Krosniewska | 25 | Daughter | Nurse | Maryland |
| 19 | Christian Olsen | 57 | Head | — | Norway |
| 20 | Thomas Olsen | 57 | Brother | — | Norway |
| 21 | John Zombowski | 24 | Head | Trucker | Maryland |
| 22 | Eleanor Zombowski | 20 | Wife | — | Maryland |
| 23 | Elaine Zombowski | 0 | Daughter | — | Maryland |
| 24 | Frank Hetmanski | 26 | Head | Supervising Clerk | Maryland |
| 25 | Sophie Hetmanski | 26 | Wife | — | Maryland |
| 26 | John Hamilton THIS PERSON | 39 | Head | Chief Engineer | Maryland |
| 27 | Stella Hamilton | 39 | Wife | — | Maryland |
| 28 | John Jr. Hamilton | 19 | Son | Helper On Truck | Maryland |
| 29 | Lillian Hamilton | 18 | Daughter | — | Maryland |
| 30 | James Hamilton | 17 | Son | — | Maryland |
| 31 | Melvin Hamilton | 14 | Son | — | Maryland |
| 32 | Benjamin Hamilton | 10 | Son | — | Maryland |
| 33 | Charles Hamilton | 3 | Son | — | Maryland |
| 34 | Edward Zeller | 48 | Head | Sweeping | Maryland |
| 35 | Elizabeth Zeller | 48 | Wife | — | Maryland |
| 36 | James E. Zeller | 19 | Head | Trucker | Maryland |
| 37 | Sady Zeller | 18 | Wife | — | Maryland |
| 38 | Julius Grzybowski | 24 | Head | Burner Welder | Maryland |
| 39 | Dorothy Grzybowski | 22 | Wife | — | Maryland |
| 40 | Thaddeus Skalski | 26 | Head | Printer | Maryland |
Pedigree Summary
John
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)