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Mary Hamilton — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Montgomery-County, Pennsylvania
Our Model Tree links this Mary Hamilton across the 1920, 1930 and 1940 US Censuses in Montgomery-County, Pennsylvania (XGBoost, ~Confirmed) — first a head (b.~1869), then head of a 3-person household.
Age 71
b. ~1869
Female
Head
Born: Ireland
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Montgomery-County, Pennsylvania |
| Surname | Hamilton |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 71 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | Erdenheim |
| 1935 Residence (County) | Montgomery |
| Naturalization Status | Naturalized |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | Erdenheim |
| Est. Birth Year | ~1869 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Barbara Hamilton | Daughter | — | 45 | ~1895 |
| Mary Hamilton | Head | — | 71 | ~1869 |
| Bells Line Ends | Other | — | — |
Census Appearances
1920
Philadelphia, Pennsylvania
Other, age 48
Philadelphia, Pennsylvania · implied b. ~1872 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hamilton |
| Given Name | Mary |
| Relationship to Head | Servant |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Single |
| Birthplace | Ireland |
| Year of Immigration | 1888 |
| Naturalization Status | Alien |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Servant |
| Industry | Private family |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
Philadelphia, Pennsylvania
Other, age 60
Philadelphia, Pennsylvania · implied b. ~1870 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hamilton |
| Given Name | Mary |
| Relationship to Head | Sister |
| Sex | F |
| Color / Race | White |
| Age | 60 |
| Marital Status | Single |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1882 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Montgomery-County, Pennsylvania
Head, age 71
Montgomery-County, Pennsylvania · implied b. ~1869 — 3 household members
| Surname | Hamilton |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 71 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | Erdenheim |
| 1935 Residence (County) | Montgomery |
| Naturalization Status | Naturalized |
| Class of Worker | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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 Mary Hamilton across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Hamilton
Head · 1940 · age 71 · b. ~1869 · Pennsylvania
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Montgomery-County, Pennsylvania
Open full size
1940 US Federal Census — Montgomery-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03584-00471)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Edna Mccormick | 50 | Head | — | Pennsylvania |
| 2 | Thomas Rial | 48 | Head | Truck Driver | Pennsylvania |
| 3 | Mae Rial | 47 | Wife | — | Pennsylvania |
| 4 | Blanche Parrish | 27 | Daughter | — | Pennsylvania |
| 5 | Francis Parrish | 4 | Son | — | Pennsylvania |
| 6 | George Gray | 43 | Head | Printer | Pennsylvania |
| 7 | Adelaide Gray | 37 | Wife | — | Pennsylvania |
| 8 | Adelaide Gray | 10 | Daughter | — | Pennsylvania |
| 9 | Catherine Cooney | 63 | Head | — | Pennsylvania |
| 10 | Marie Cooney | 32 | Daughter | Stenographer | Pennsylvania |
| 11 | Margaret Cooney | 23 | Daughter | File Clerk | Pennsylvania |
| 12 | John Cooney | 21 | Son | Truck Driver | Pennsylvania |
| 13 | Clifford Winkler | 40 | Boarder | Mechanic | Pennsylvania |
| 14 | Catherine Winkler | 31 | Daughter | — | Pennsylvania |
| 15 | Paul Winkler | 1 | Son | — | Pennsylvania |
| 16 | Agnew Jackson | 38 | Head | Clerk | Ireland |
| 17 | Eva Jackson | 31 | Wife | — | Pennsylvania |
| 18 | Margaret Jackson | 9 | Daughter | — | Pennsylvania |
| 19 | David Jackson | 3 | Son | — | Pennsylvania |
| 20 | Robert Anderson | 71 | Head | — | Pennsylvania |
| 21 | Anne Anderson | 33 | Daughter | Bookkeeper | Pennsylvania |
| 22 | Charles Anderson | 18 | Son | Newworker | Pennsylvania |
| 23 | George A. White | 34 | Head | Engineer | Pennsylvania |
| 24 | Mary J. White | 33 | Wife | — | Pennsylvania |
| 25 | Kirk J. White | 2 | Son | — | Pennsylvania |
| 26 | James Mrs. Glass | 72 | Head | — | Scotland |
| 27 | Alma Glass | 46 | Daughter | — | Pennsylvania |
| 28 | Thomas Hughes | 47 | Head | Home Nursery | Pennsylvania |
| 29 | Bessie Hughes | 51 | Wife | — | Pennsylvania |
| 30 | J. Weir Hamilton | 43 | Head | Art Teacher | Pennsylvania |
| 31 | Germaine Hamilton | 44 | Wife | — | France |
| 32 | Jack Hamilton | 17 | Son | — | Pennsylvania |
| 33 | Mary Hamilton THIS PERSON | 71 | Head | — | Ireland |
| 34 | Barbara Hamilton | 45 | Daughter | Teacher | Pennsylvania |
| 35 | Bells Mill (Line Ends) | None | Road and | — | — |
| 36 | George Byron | 44 | Head | Watchman | Pennsylvania |
| 37 | Leon Edwards | 23 | Son | Newworker | Pennsylvania |
| 38 | Florence Edwards | 20 | Daughter | — | Pennsylvania |
| 39 | Florence Edwards | 1 | Daughter | — | Pennsylvania |
| 40 | Ella Johns | 48 | Head | — | 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)