JM
John Monahan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Hamilton-County, Ohio
Our Model Tree links this John Monahan across the 1920, 1930 and 1940 US Censuses in Hamilton-County, Ohio (XGBoost, ~Confirmed), with identified parents John & John — first a son (b.~1915), then head of a 6-person household.
Age 25
b. ~1915
Male
Son
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hamilton-County, Ohio |
| Surname | Monahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Norwood city |
| 1935 Residence (County) | Hamilton |
| Additional Details | |
| Occupation | office clerk |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 40 |
| Highest Grade | C 4 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Occupation | Office Clerk |
| Township / Ward | Norwood City |
| Est. Birth Year | ~1915 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Monahan | Son | — | 25 | ~1915 |
| Wm Monahan | Son | — | 22 | ~1918 |
| Paul Monahan | Son | — | 18 | ~1922 |
| Joan Monahan | Spouse | — | 52 | ~1888 |
| John Monahan | Head | — | 54 | ~1886 |
| Thomas Monahan | Son | — | 24 | ~1916 |
Census Appearances
1920
Hamilton, Ohio
Son, age 5
Hamilton, Ohio · implied b. ~1915 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Monahan |
| Given Name | John Jr. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Occupation | none |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1930
Hamilton, Ohio
Son, age 15
Hamilton, Ohio · implied b. ~1915 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Monahan |
| Given Name | John Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Can Read/Write | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Hamilton-County, Ohio
Son, age 25
Hamilton-County, Ohio · implied b. ~1915 — 6 household members
| Surname | Monahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Norwood city |
| 1935 Residence (County) | Hamilton |
| Occupation | office clerk |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 40 |
| Highest Grade | C 4 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
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 Monahan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Monahan (~0.92 confidence) and father John Monahan (~0.92 confidence) and mother Rose Monahan (~0.92 confidence) and mother Joan Monahan (~0.92 confidence) and mother Joan Monahan (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Monahan
b. ~1881
Source father
● Household
· direct · ~0.92
Father
John Monahan
b. ~1886
Source father
● Household
· direct · ~0.92
Mother
Rose Monahan
b. ~1886
Source mother
● Household
· direct · ~0.92
Mother
Joan Monahan
b. ~1888
Source mother
● Household
· direct · ~0.92
Mother
Joan Monahan
b. ~1888
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Monahan
Son · 1940 · age 25 · b. ~1915 · Ohio
★ You are viewing this record
Sibling
Paul Monahan
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Monahan
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Wm Monahan
Sibling · 1940 · age 22
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 — Hamilton-County, Ohio
Open full size
1940 US Federal Census — Hamilton-County, Ohio
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03078-00612)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Bessie Yunger | 67 | Mother-in-law | — | Indiana |
| 2 | John H. Monahan | 54 | Head | Mgr. Of Estate | Ohio |
| 3 | Joan Monahan | 52 | Wife | — | Ohio |
| 4 | John Monahan THIS PERSON | 25 | Son | Office Clerk | Ohio |
| 5 | Thomas J. Monahan | 24 | Son | Asst. Faster Clerk | Ohio |
| 6 | Wm Frances Monahan | 22 | Son | Clerical | Ohio |
| 7 | Paul Donald Monahan | 18 | Son | — | Ohio |
| 8 | Ralph Howard | 36 | Head | Mgr. Oil Station | Kentucky |
| 9 | Viola Howard | 34 | Wife | — | Ohio |
| 10 | Robert L. Howard | 2 | Son | — | Ohio |
| 11 | Julius Bechthold | 77 | Head | Proof Reader | Massach. |
| 12 | Mary Bechthold | 65 | Wife | — | Kentucky |
| 13 | Ritt Van Hoose | 36 | Head | Radio Operator | Kentucky |
| 14 | Ruth Van Hoose | 30 | Wife | — | Tennessee |
| 15 | Mary Louise Van Hoose | 7 | Daughter | — | Michigan |
| 16 | Phyllis Ann Van Hoose | 5 | Daughter | — | Kentucky |
| 17 | Albert Paul Van Hoose | 2 | Son | — | Ohio |
| 18 | B. N. De Will | 32 | Head | Mechanic | Ohio |
| 19 | Alice De Will | 28 | Wife | — | Indiana |
| 20 | James De Will | 3 | Son | — | Ohio |
| 21 | Ralph Carson | 33 | Brother-in-law | Oil Station Attendant | Indiana |
| 22 | Olive C. Ross | 60 | Head | — | Kentucky |
| 23 | Wm C. Ross | 37 | Son | Sheet Metal | Ohio |
| 24 | Clara Heil | 64 | Head | — | Ohio |
| 25 | Horace Ezzell | 27 | Son-in-law | Recondition Auto Parts | Tennessee |
| 26 | Daughter Hildreth | None | F | — | — |
| 27 | Clara Sue Hildreth | 4 | Daughter | — | Ohio |
| 28 | Horace Jr. Hildreth | 1 | Son | — | Ohio |
| 29 | Albert Hothmeyer | 48 | Head | Mgr. City Club | Ohio |
| 30 | Grace Hothmeyer | 45 | Wife | — | Ohio |
| 31 | Jean Hothmeyer | 25 | Daughter | Office Work | Ohio |
| 32 | Robert Hothmeyer | 22 | Son | Office Work | Ohio |
| 33 | Albert Hothmeyer | 20 | Son | Dry Cleaning | Ohio |
| 34 | Lorrayne Hothmeyer | 16 | Daughter | — | Ohio |
| 35 | Dorothy Hothmeyer | 8 | Daughter | — | Ohio |
| 36 | James Lobein | 15 | Nephew | — | Ohio |
| 37 | Nora Martin | None | Sister-in-law | Secretary | Ohio |
| 38 | F. Jos. Schlander | 63 | Head | Office Worker | Ohio |
| 39 | Elizabeth Schlander | 61 | Wife | — | Ohio |
| 40 | Paul J. Schlander | 25 | Son | Surveyor | Ohio |
Pedigree Summary
John + 3 siblings
Gen 1 · 5 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)