JH
John Hamilton — 1940 US Census Record
Model Tree available1940 United States Federal Census · Linn-County, Iowa
Our Model Tree links this John Hamilton across the 1910, 1920, 1930 and 1940 US Censuses in Linn-County, Iowa (XGBoost, ~Confirmed), with identified parents Andrew & Gertrude — first a head (b.~1906), then head of a 3-person household.
Age 34
b. ~1906
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Linn-County, Iowa |
| Surname | Hamilton |
| Given Name | John |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Cedar Rapids |
| 1935 Residence (County) | Linn |
| Additional Details | |
| Occupation | laborer |
| Industry | stock yards |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1180 |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Laborer |
| Township / Ward | Cedar Rapids |
| Est. Birth Year | ~1906 |
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 |
|---|---|---|---|---|
| John Hamilton | Head | — | 34 | ~1906 |
| John Hamilton | Son | — | 1 | ~1939 |
| Rose Hamilton | Spouse | — | 24 | ~1916 |
Census Appearances
1910
Linn, Iowa
Son, age 4
Linn, Iowa · implied b. ~1906 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hamilton |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1920
Linn, Iowa
Son, age 13
Linn, Iowa · implied b. ~1907 — 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 | 13 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Linn, Iowa
Son, age 23
Linn, Iowa · implied b. ~1907 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hamilton |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Linn-County, Iowa
Head, age 34
Linn-County, Iowa · implied b. ~1906 — 3 household members
| Surname | Hamilton |
| Given Name | John |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Cedar Rapids |
| 1935 Residence (County) | Linn |
| Occupation | laborer |
| Industry | stock yards |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1180 |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Andrew Hamilton (~0.92 confidence) and mother Gertrude Hamilton (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Andrew Hamilton
b. ~1864
Source father
● Household
· direct · ~0.92
Mother
Gertrude Hamilton
b. ~1869
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Hamilton
Head · 1940 · age 34 · b. ~1906 · Iowa
★ 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 — Linn-County, Iowa
Open full size
1940 US Federal Census — Linn-County, Iowa
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-01177-00676)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Phillis Gardner | 9 | daughter | — | Iowa |
| 2 | Ira Barcus | 33 | head | Butcher | Indiana |
| 3 | Josephine Barcus | 26 | wife | — | Iowa |
| 4 | Floyd Barcus | 4 | son | — | Iowa |
| 5 | Jacqueline Barcus | 1 | daughter | — | Iowa |
| 6 | Glen S. Gladwin | 27 | head | Gardener | Iowa |
| 7 | Gladys Gladwin | 25 | wife | Packer | Iowa |
| 8 | Harry O. Boots | 44 | head | Laborer | Iowa |
| 9 | Elmer Jayne | 53 | head | Laborer | Iowa |
| 10 | Clara O. Jayne | 49 | wife | — | Iowa |
| 11 | John Hamilton THIS PERSON | 34 | head | Laborer | Iowa |
| 12 | Rose Hamilton | 24 | wife | — | Minnesota |
| 13 | John Jr. Hamilton | 1 | son | — | Iowa |
| 14 | Mary S. Peyer | 63 | head | — | France |
| 15 | Donald Osborne | 29 | head | 156 | Iowa |
| 16 | Florence S. Osborne | 26 | wife | — | Iowa |
| 17 | Jackie Osborne | 5 | son | — | Iowa |
| 18 | James Osborne | 3 | son | — | Iowa |
| 19 | Nancy Osborne | 1 | daughter | — | Iowa |
| 20 | Harry Papes | 50 | head | 52 | Greece |
| 21 | Lillie Papes | 34 | wife | — | Iowa |
| 22 | John Papes | 17 | son | 18 | Iowa |
| 23 | Helen Papes | 11 | daughter | — | Iowa |
| 24 | Sherman S. Hutton | 55 | head | Teamster | Iowa |
| 25 | Andrew Hutton | 52 | brother | Laborer | Iowa |
| 26 | James Hutton | 51 | brother | Laborer | Iowa |
| 27 | Albert Thomas | 35 | head | Painter | Iowa |
| 28 | Meta S. Thomas | 30 | wife | — | Denmark |
| 29 | Dorothy Thomas | 10 | daughter | — | Iowa |
| 30 | John Thomas | 7 | son | — | Iowa |
| 31 | Marie Thomas | 5 | daughter | — | Iowa |
| 32 | Pona Thomas | 4 | daughter | — | Iowa |
| 33 | Beverly Thomas | 2 | daughter | — | Iowa |
| 34 | Rose Thomas | 0 | daughter | — | Iowa |
| 35 | Joseph Hospodarsky | 75 | head | — | Iowa |
| 36 | Emma S. Hospodarsky | 44 | wife | — | Iowa |
| 37 | Irene Hospodarsky | 20 | daughter | Maid | Iowa |
| 38 | Perry Abbot | 26 | son-in-law | Janitor | Iowa |
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)