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John Monahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Fayette-County, Pennsylvania
Our Model Tree links this John Monahan across the 1930 and 1940 US Censuses in Fayette-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1921), then head of a 10-person household.
Age 19
b. ~1921
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Fayette-County, Pennsylvania |
| Surname | Monahan |
| Given Name | John P. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Homewood Terrace |
| 1935 Residence (County) | Fayette |
| Additional Details | |
| Highest Grade | H 3 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Homewood Terrace |
| Est. Birth Year | ~1921 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Hugh Monahan | Son | — | 14 | ~1926 |
| Amelia Monahan | Spouse | — | 37 | ~1903 |
| M Monahan | Daughter | — | 24 | ~1916 |
| Duane Monahan | Son | — | 12 | ~1928 |
| John Monahan | Son | — | 19 | ~1921 |
| Francis Monahan | Son | — | 17 | ~1923 |
| Katherine Monahan | Daughter | — | 5 | ~1935 |
| Amelia Monahan | Daughter | — | 10 | ~1930 |
| Dorothy Monahan | Daughter | — | 21 | ~1919 |
| Hugh Monahan | Head | — | 37 | ~1903 |
Census Appearances
1930
Fayette, Pennsylvania
Son, age 9
Fayette, Pennsylvania · implied b. ~1921 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Monahan |
| Given Name | John P |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Fayette-County, Pennsylvania
Son, age 19
Fayette-County, Pennsylvania · implied b. ~1921 — 10 household members
| Surname | Monahan |
| Given Name | John P. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Homewood Terrace |
| 1935 Residence (County) | Fayette |
| Highest Grade | H 3 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Monahan
Son · 1940 · age 19 · b. ~1921 · Pennsylvania
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Sibling
Katherine Monahan
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Monahan
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Duane Monahan
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
M Monahan
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Amelia Monahan
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hugh Monahan
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Monahan
Sibling · 1940 · age 17
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 — Fayette-County, Pennsylvania
Open full size
1940 US Federal Census — Fayette-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03506-00358)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Matthew H. Borland | 59 | Head | Teacher | Pennsylvania |
| 42 | Alice D. Borland | 56 | Wife | — | Ohio |
| 43 | Matthew H. Jr. Borland | 21 | Son | Clerk | Pennsylvania |
| 44 | Robert P. Borland | 18 | Son | Delivery Boy | Pennsylvania |
| 45 | Eugene M. Frederick | 25 | Head | Asst. Superintendent | Pennsylvania |
| 46 | Bernice J. Frederick | 23 | Wife | — | Pennsylvania |
| 47 | Ronald E. Frederick | 1 | Son | — | Pennsylvania |
| 48 | Curtis Liston | 55 | Head | Patrolman | West Virginia |
| 49 | Olive E. Liston | 46 | Wife | — | Pennsylvania |
| 50 | J. Frederick Liston | 16 | Son | — | Pennsylvania |
| 51 | Lois L. Liston | 11 | Daughter | — | Pennsylvania |
| 52 | Alfred F. Sandorf | 39 | Head | Carpenter | Pennsylvania |
| 53 | Kathryn R. Sandorf | 37 | Wife | — | Pennsylvania |
| 54 | Alfred F. Jr. Sandorf | 15 | Son | — | Pennsylvania |
| 55 | Gloria Sandorf | 13 | Daughter | — | Pennsylvania |
| 56 | Robert E. Sandorf | 8 | Son | — | Pennsylvania |
| 57 | Patricia Sandorf | 1 | Daughter | — | Pennsylvania |
| 58 | Emmett F. Brown | 29 | Head | Teacher | Pennsylvania |
| 59 | Lina B. Brown | 32 | Wife | Substitute Teacher | Pennsylvania |
| 60 | Thomas H. Lucas | 34 | Head | Asst. Foreman | Pennsylvania |
| 61 | Catherine E. Lucas | 30 | Wife | — | Pennsylvania |
| 62 | Thomas H. Jr. Lucas | 11 | Son | — | Pennsylvania |
| 63 | Joan F. Lucas | 6 | Daughter | — | Pennsylvania |
| 64 | Hugh L. Monahan | 37 | Head | Warehouse Manager | Pennsylvania |
| 65 | Amelia B. Monahan | 37 | Wife | — | Pennsylvania |
| 66 | M. Velma Monahan | 24 | Daughter | Seamstress | Pennsylvania |
| 67 | Dorothy E. Monahan | 21 | Daughter | Counter Girl | Pennsylvania |
| 68 | John P. Monahan THIS PERSON | 19 | Son | — | Pennsylvania |
| 69 | Francis L. Monahan | 17 | Son | Delivery Boy | Pennsylvania |
| 70 | Hugh L. Jr. Monahan | 14 | Son | — | Pennsylvania |
| 71 | Duane E. Monahan | 12 | Son | — | Pennsylvania |
| 72 | Amelia B. Monahan | 10 | Daughter | — | Pennsylvania |
| 73 | Katherine A. Monahan | 5 | Daughter | — | Pennsylvania |
| 74 | Frank P. Elbert | 27 | Head | Usher | Pennsylvania |
| 75 | Helen H. Elbert | 25 | Wife | — | Pennsylvania |
| 76 | Franklin P. Elbert | 3 | Son | — | Pennsylvania |
| 77 | John Brnich | 53 | Head | Barber | Austria |
| 78 | Catherine M. Brnich | 53 | Wife | — | Austria-Hungary |
| 79 | Paul Yablonsky | 69 | Brother-in-law | — | Austria-Hungary |
| 80 | Andrew V. Kurtz | 73 | Head | — | Austria |
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)