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John Monahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this John Monahan across the 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1915), then head of a 9-person household.
Age 25
b. ~1915
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | Monahan |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia City |
| 1935 Residence (County) | Philadelphia |
| Additional Details | |
| Occupation | Clerk |
| Industry | Bank |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Clerk |
| Township / Ward | Philadelphia 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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Eugene Monahan | Son | — | 13 | ~1927 |
| John Monahan | Head | — | 51 | ~1889 |
| Charlotte Monahan | Daughter | — | 5 | ~1935 |
| Charles Monahan | Son | — | 10 | ~1930 |
| John Monahan | Son | — | 25 | ~1915 |
| Eileen Monahan | Spouse | — | 46 | ~1894 |
| Caroline Monahan | Daughter | — | 8 | ~1932 |
| Elizabeth Monahan | Daughter | — | 11 | ~1929 |
| Joseph Monahan | Son | — | 20 | ~1920 |
Census Appearances
1930
Philadelphia, Pennsylvania
Son, age 13
Philadelphia, Pennsylvania · implied b. ~1917 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Monohan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Philadelphia-County, Pennsylvania
Son, age 25
Philadelphia-County, Pennsylvania · implied b. ~1915 — 9 household members
| Surname | Monahan |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia City |
| 1935 Residence (County) | Philadelphia |
| Occupation | Clerk |
| Industry | Bank |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| 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 25 · b. ~1915 · Pennsylvania
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Sibling
Joseph Monahan
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charlotte Monahan
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eugene Monahan
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Caroline Monahan
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Monahan
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Monahan
Sibling · 1940 · age 11
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 — Philadelphia-County, Pennsylvania
Open full size
1940 US Federal Census — Philadelphia-County, Pennsylvania
Page Contents
34 people indexed on this census page (nara:1940:m-t0627-03704-00113)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John J. Monahan | 51 | Head | Waiter | Ireland |
| 2 | Eileen Monahan | 46 | Wife | Housewife | Poland |
| 3 | John Jr. Monahan THIS PERSON | 25 | Son | Clerk | Pennsylvania |
| 4 | Joseph J. Monahan | 20 | Son | Unemployed | Pennsylvania |
| 5 | Eugene Monahan | 13 | Son | — | Pennsylvania |
| 6 | Elizabeth Monahan | 11 | Daughter | — | Pennsylvania |
| 7 | Charles Monahan | 10 | Son | — | Pennsylvania |
| 8 | Caroline Monahan | 8 | Daughter | — | Pennsylvania |
| 9 | Charlotte Monahan | 5 | Daughter | — | Pennsylvania |
| 11 | Caroline E. O'Neill | 46 | Head | Housekeeper | Pennsylvania |
| 12 | Frank J. Iii O'Neill | 20 | Son | Roofer | Pennsylvania |
| 13 | Emerson Mason | 29 | Lodger | Milkman | Pennsylvania |
| 14 | Vanessa Mason | 27 | Lodger | Housewife | Virginia |
| 15 | Sally May (Mary) Mason | 1 | Lodger | — | Pennsylvania |
| 16 | Walter R. Mcwilliam | 56 | Lodger | Mechanic Auto | Maryland |
| 17 | Chris H. Mcwilliam | 18 | Lodger | Laborer | Pennsylvania |
| 18 | Margaret Hannan | 70 | Head | Housewife | Ireland |
| 19 | Joseph Mclaren | 66 | Lodger | Gardener | Ireland |
| 20 | Adam Dietrich | 70 | Lodger | Mccallum Manor | Germany |
| 21 | Mary Kerwin | 75 | Lodger | Housewife | Ireland |
| 22 | Robert J. Boyd | 65 | Head | Park Guard | Penna. |
| 23 | Blanche T. Boyd | 60 | Wife | Housewife | Penna. |
| 24 | Samuel W. Boyd | 63 | Brother | Unemployed | Penna. |
| 25 | Fannie Heffner | 65 | Head | Housewife | Maryland |
| 26 | Edward P. Heffner | 22 | Son | Clerk | Penna. |
| 27 | Priscilla Meyer | 18 | Niece | Unemployed | Penna. |
| 28 | Robert A. Good | 5 | Lodger | — | Penna. |
| 29 | William Boose | 66 | Lodger | Storekeeper | Penna. |
| 30 | Edward B. Miller | 27 | Lodger | Clerical | Penna. |
| 31 | Thomas Latimer | 44 | Lodger | Collector | Penna. |
| 32 | Howard F. Sr. Shugard | 58 | Head | Gardening | Penna. |
| 33 | Henry Shugard | 30 | Son | Salesman | Penna. |
| 34 | Mildred Shugard | 29 | Wife | Housewife | Delaware |
| 35 | Paul G. Shugard | 20 | Son | Clerk | Penna. |
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)