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John Monahan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Kings-County, New York
Our Model Tree links this John Monahan across the 1920, 1930 and 1940 US Censuses in Kings-County, New York (XGBoost, ~Confirmed), with identified parents Catherine & Thomas — first a son (b.~1917), then head of a 6-person household.
Age 23
b. ~1917
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Kings-County, New York |
| Surname | Monahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Additional Details | |
| Occupation | Helper |
| Industry | Dept. Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 631 |
| Highest Grade | H-3 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Helper |
| Township / Ward | New York City |
| Est. Birth Year | ~1917 |
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 | — | 23 | ~1917 |
| Bridget Monahan | Spouse | — | 51 | ~1889 |
| Thomas Monahan | Son | — | 18 | ~1922 |
| James Monahan | Son | — | 17 | ~1923 |
| Edward Monahan | Son | — | 22 | ~1918 |
| Thomas Monahan | Head | — | 52 | ~1888 |
Census Appearances
1920
Kings, New …
Other, age 2
Kings, New York · implied b. ~1918 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Monahan |
| Given Name | John |
| Relationship to Head | Grandson |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Kings, New …
Son, age 13
Kings, New York · implied b. ~1917 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Monahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Kings-County, New …
Son, age 23
Kings-County, New York · implied b. ~1917 — 6 household members
| Surname | Monahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Occupation | Helper |
| Industry | Dept. Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 631 |
| Highest Grade | H-3 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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: mother Catherine Monahan (~0.92 confidence) and father Thomas Monahan (~0.92 confidence) and mother Bridget Monahan (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Catherine Monahan
b. ~1888
Source mother
● Household
· direct · ~0.92
Father
Thomas Monahan
b. ~1888
Source father
● Household
· direct · ~0.92
Mother
Bridget Monahan
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Monahan
Son · 1940 · age 23 · b. ~1917 · New York
★ You are viewing this record
Sibling
Edward Monahan
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Monahan
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Monahan
Sibling · 1940 · age 18
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 — Kings-County, New York
Open full size
1940 US Federal Census — Kings-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02563-00402)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary J. Doyle | 70 | Head | Teacher | New York |
| 2 | Eva J. Doyle | 59 | Sister | Teacher | New York |
| 3 | Frank Kiefer | 53 | Head | Salesman | New York |
| 4 | Ellen Kiefer | 48 | Wife | — | New York |
| 5 | William Kelly | 30 | Head | Chauffeur | New York |
| 6 | Marian Kelly | 24 | Wife | — | New York |
| 7 | Olga Nolan | 65 | Head | — | New Jersey |
| 8 | Leon Broder | 36 | Son-in-law | Rubber Goods | New York |
| 9 | Gladys Broder | 39 | Daughter | — | Massachusetts |
| 10 | Leon Broder | 12 | Grandson | — | New York |
| 11 | Susan Joseph | 50 | Head | — | New York |
| 12 | Hyman Joseph | 29 | Son | Shipping Clerk | New York |
| 13 | Charles Hopkins | 39 | Head | Clerk | Baltimore, Md. |
| 14 | Frances Hopkins | 38 | Wife | — | Austria |
| 15 | Frances Hopkins | 17 | Daughter | Clerk | New York |
| 16 | Charles Hopkins | 11 | Son | — | New York |
| 17 | Frederick Downs | 29 | Head | Sheet Metal Worker | England |
| 18 | Elizabeth Downs | 28 | Wife | Clerk | New York |
| 19 | Virginia Downs | 2 | Daughter | — | New York |
| 20 | Charles Butts | 34 | Head | Elevator Operator | Virginia |
| 21 | Helen Butts | 34 | Wife | — | New York |
| 22 | Florence Butts | 7 | Daughter | — | New York |
| 23 | Charles Butts | 2 | Son | — | New York |
| 24 | Florence Lacey | 36 | Sister-in-law | Teacher | New York |
| 25 | John M. Lacey | 10 | Nephew | — | New York |
| 26 | Felton Terry | 28 | Head | Mechanic | Georgia |
| 27 | Pearline Terry | 24 | Wife | Housewife | South Carolina |
| 28 | Herman Kochman | 36 | Head | Proprietor | Germany |
| 29 | Dora Kochman | 35 | Wife | — | Germany |
| 30 | Bertha Kochman | 11 | Daughter | — | New York |
| 31 | Gustave Kochman | 9 | Son | — | New York |
| 32 | Herman Jr. Kochman | 2 | Son | — | New York |
| 33 | John Fluegge | 70 | Head | Proprietor | Germany |
| 34 | Matilda Fluegge | 58 | Wife | — | Germany |
| 35 | Thomas Monahan | 52 | Head | Mixer | Free State |
| 36 | Bridget Monahan | 51 | Wife | — | Free State |
| 37 | John Monahan THIS PERSON | 23 | Son | Helper | New York |
| 38 | Edward Monahan | 22 | Son | Clerk | New York |
| 39 | Thomas Monahan | 18 | Son | Messenger | New York |
| 40 | James Monahan | 17 | Son | New Worker | New York |
Pedigree Summary
John + 3 siblings
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)