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John Mann — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Delaware-County, Pennsylvania
Our Model Tree links this John Mann across the 1930 and 1940 US Censuses in Delaware-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1924), then head of a 8-person household.
Age 16
b. ~1924
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Delaware-County, Pennsylvania |
| Surname | Mann |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Chester |
| 1935 Residence (County) | Delaware |
| Additional Details | |
| Occupation | no |
| Industry | no |
| Class of Worker | no |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Chester |
| Est. Birth Year | ~1924 |
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 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Francis Mann | Son | — | 13 | ~1927 |
| Henry Mann | Son | — | 18 | ~1922 |
| John Mann | Son | — | 16 | ~1924 |
| Mary Mann | Spouse | — | 44 | ~1896 |
| Mary Mann | Daughter | — | 1 | ~1939 |
| Patricia Mann | Daughter | — | 5 | ~1935 |
| Henry Mann | Head | — | 40 | ~1900 |
| Theresa Mann | Daughter | — | 12 | ~1928 |
Census Appearances
1930
Delaware, Pennsylvania
Son, age 6
Delaware, Pennsylvania · implied b. ~1924 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mann |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| 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
Delaware-County, Pennsylvania
Son, age 16
Delaware-County, Pennsylvania · implied b. ~1924 — 8 household members
| Surname | Mann |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Chester |
| 1935 Residence (County) | Delaware |
| Occupation | no |
| Industry | no |
| Class of Worker | no |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 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 Mann across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Mann
Son · 1940 · age 16 · b. ~1924 · Pennsylvania
★ You are viewing this record
Sibling
Theresa Mann
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Henry Mann
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mann
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Mann
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Mann
Sibling · 1940 · age 13
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 — Delaware-County, Pennsylvania
Open full size
1940 US Federal Census — Delaware-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03489-00261)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Virgil R. Johnson | 31 | Head | Trimmer | Maryland |
| 2 | Thelma Gertrude Johnson | 30 | Wife | No | Maryland |
| 3 | Rodney Johnson | 3 | Son | — | Maryland |
| 4 | Charles Mccrinn | 42 | Head | Spinner | Pennsylvania |
| 5 | Nellie Mccrinn | 41 | Wife | Spinner | Ireland |
| 6 | Charles Jr. Mccrinn | 20 | Son | Machinist Helper | Pennsylvania |
| 7 | John Mccrinn | 19 | Son | Cake Boy | Pennsylvania |
| 8 | James Mccrinn | 16 | Son | No | Pennsylvania |
| 9 | Francis Mccrinn | 15 | Son | No | Pennsylvania |
| 10 | Joseph Mccrinn | 12 | Son | — | Pennsylvania |
| 11 | William Mccrinn | 9 | Son | — | Pennsylvania |
| 12 | George Harrington | 45 | Head | Laborer | Delaware |
| 13 | Dorothy Harrington | 43 | Wife | No | Massachusetts |
| 14 | Kathryn Harrington | 17 | Daughter | No | Delaware |
| 15 | George Marvel | 29 | Son-in-law | Laborer | Delaware |
| 16 | Jeanette Marvel | 22 | Daughter | Curtain Lace Operator | Delaware |
| 17 | Henry Mann | 40 | Head | Plumper | Pennsylvania |
| 18 | Mary Mann | 44 | Wife | No | Pennsylvania |
| 19 | Henry Jr. Mann | 18 | Son | New Worker | Pennsylvania |
| 20 | John Mann THIS PERSON | 16 | Son | No | Pennsylvania |
| 21 | Francis Mann | 13 | Son | — | Pennsylvania |
| 22 | Theresa Mann | 12 | Daughter | — | Pennsylvania |
| 23 | Patricia Mann | 5 | Daughter | — | Pennsylvania |
| 24 | Mary Mann | 1 | Daughter | — | Pennsylvania |
| 25 | Thomas Vrean | 28 | Head | Foreman | Ohio |
| 26 | Ada Vrean | 61 | Mother | No | England |
| 27 | Annie Dobie | 44 | Head | Furrier | Scotland |
| 28 | John R. Dobie | 5 | Son | — | Pennsylvania |
| 29 | Norman Peat | 41 | Head | Machinist | Scotland |
| 30 | Isabel Peat | 39 | Wife | Assembly Dept | Scotland |
| 31 | Marjorie Peat | 12 | Daughter | — | Pennsylvania |
| 32 | Jean Peat | 63 | Mother | No | Scotland |
| 33 | William Rothnagle | 44 | Head | Carpenter | Pennsylvania |
| 34 | Helen Rothnagle | 40 | Wife | No | Pennsylvania |
| 35 | William Rothnagle | 18 | Son | No | Pennsylvania |
| 36 | Jean Rothnagle | 14 | Daughter | — | Pennsylvania |
| 37 | Dorothy Rothnagle | 12 | Daughter | — | Pennsylvania |
| 38 | Martin Huberman | 29 | Head | Optometrist | Pennsylvania |
| 39 | Mary Huberman | 27 | Wife | No | Pennsylvania |
| 40 | Elaine Huberman | 3 | Daughter | — | Pennsylvania |
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)