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John Monahan — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Hamilton, Ohio
Our Model Tree links this John Monahan across the 1920 and 1930 US Censuses in Hamilton, Ohio (XGBoost, ~Confirmed) — first a son (b.~1907), then head of a 8-person household.
Age 23
b. ~1907
Male
Son
Born: Ohio
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Hamilton, Ohio |
| Surname | Monahan |
| Given Name | John M Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Additional Details | |
| Occupation | Grinder |
| Industry | Wood Tool Mfg |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Occupation | Grinder |
| Township / Ward | Cincinnati City |
| Est. Birth Year | ~1907 |
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 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Elaine Monahan | Daughter | — | 11 | ~1919 |
| John Monahan | Head | — | 45 | ~1885 |
| Helen Monahan | Daughter | — | 21 | ~1909 |
| John Monahan | Son | — | 23 | ~1907 |
| Gus Burmann | Other | — | 38 | ~1892 |
| Robert Monahan | Son | — | 6 | ~1924 |
| Frances Monahan | Spouse | — | 41 | ~1889 |
| Thomas Monahan | Son | — | 16 | ~1914 |
Census Appearances
1920
Hamilton, Ohio
Son, age 13
Hamilton, Ohio · implied b. ~1907 — 7 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 | 13 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1930
Hamilton, Ohio
Son, age 23
Hamilton, Ohio · implied b. ~1907 — 8 household members
| Surname | Monahan |
| Given Name | John M Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Occupation | Grinder |
| Industry | Wood Tool Mfg |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| 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 2 US Census years (1920 and 1930) in Hamilton, Ohio, using XGBoost record linkage.
Show:
This person
Anchor record
John Monahan
Son · 1930 · age 23 · b. ~1907 · Ohio
★ You are viewing this record
Sibling
Elaine Monahan
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Monahan
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Monahan
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Monahan
Sibling · 1930 · age 21
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
1930 US Federal Census — Hamilton, Ohio
Open full size
1930 US Federal Census — Hamilton, Ohio
Page Contents
50 people indexed on this census page (ia:1930:ohiocensus00reel1813:1011)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Charles Mcelroy | 17 | Son | Typist | Ohio |
| 2 | Robert Mcelroy | 15 | Son | — | Ohio |
| 3 | Daniel Mcelroy | 12 | Son | — | Ohio |
| 4 | John M Monahan | 45 | Head | Truck Driver | Ohio |
| 5 | Frances Monahan | 41 | Wife | — | France |
| 6 | John M Jr Monahan THIS PERSON | 23 | Son | Grinder | Ohio |
| 7 | Helen Monahan | 21 | Daughter | Operator | Ohio |
| 8 | Thomas Monahan | 16 | Son | Office Boy | Ohio |
| 9 | Elaine Monahan | 11 | Daughter | — | Ohio |
| 10 | Robert Monahan | 6 | Son | — | Ohio |
| 11 | Gus Burmann | 38 | Brother-in-law | Candy Maker | Ohio |
| 12 | Bernard Gorman | 48 | Head | Conductor | Ohio |
| 13 | Bridget Gorman | 44 | Wife | — | Irish Free State |
| 14 | Henry J Gorman | 20 | Son | Repairman | Ohio |
| 15 | Louis J Gorman | 18 | Son | Attendant | Ohio |
| 16 | Bertha M Gorman | 17 | Daughter | Operator | Ohio |
| 17 | Benedict P Gorman | 15 | Son | — | Ohio |
| 18 | Victor Gorman | 10 | Son | — | Kentucky |
| 19 | Theresa Gorman | 8 | Daughter | — | Kentucky |
| 20 | William E Lucas | 46 | Head | Manager | Indiana |
| 21 | May Lucas | 40 | Wife | Chicken Lady | Indiana |
| 22 | George W Lucas | 17 | Son | Laborer | Indiana |
| 23 | Mary Ann Lucas | 15 | Daughter | — | Indiana |
| 24 | Amos W Lucas | 13 | Son | — | Indiana |
| 25 | William E Jr Lucas | 11 | Son | — | Indiana |
| 26 | Michael J Ward | 37 | Head | Inspector | Ohio |
| 27 | Grace A Ward | 39 | Wife | — | Ohio |
| 28 | Albert C Ruff | 42 | Head | Laborer | Ohio |
| 29 | Rose Ruff | 24 | Wife | — | Ohio |
| 30 | Albert Jr Ruff | 3 | Son | — | Ohio |
| 31 | Robert J Ruff | 1 | Son | — | Ohio |
| 32 | Agnes Burke | 40 | Head | Clerk | Ohio |
| 33 | James Burke | 32 | Brother | Driver | Ohio |
| 34 | Harry J Doyle | 42 | Head | Service Man | Ohio |
| 35 | Anna M Doyle | 41 | Wife | — | Germany |
| 36 | Catherine M Doyle | 21 | Daughter | Stenographer | Ohio |
| 37 | Helen V Doyle | 19 | Daughter | Comptometer Oper | Ohio |
| 38 | Harry J Jr Doyle | 17 | Son | Mail Clerk | Ohio |
| 39 | Robert J Doyle | 15 | Son | — | Ohio |
| 40 | Raymond J Doyle | 13 | Son | — | Ohio |
| 41 | Paul J Doyle | 10 | Son | — | Ohio |
| 42 | Anne May Doyle | 8 | Daughter | — | Ohio |
| 43 | M Patricia Doyle | 5 | Daughter | — | Ohio |
| 44 | John Richard Doyle | 4 | Son | — | Ohio |
| 45 | Abraham Meyer | 54 | Head | — | Soviet Russia |
| 46 | Sarah Meyer | 48 | Wife | — | Soviet Russia |
| 47 | William Meyer | 25 | Son | Phone Clerk | Ohio |
| 48 | Fanny Meyer | 19 | Daughter | Stenographer | Ohio |
| 49 | Jeanette Meyer | 14 | Daughter | — | Ohio |
| 50 | Irwin Meyer | 11 | Son | — | Ohio |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)