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Mary Dempsey — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this Mary Dempsey across the 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1912), then head of a 8-person household.
Age 28
b. ~1912
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | Dempsey |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | Philadelphia |
| Additional Details | |
| Occupation | Telephone operator |
| Industry | Telephone company |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1144 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Telephone Operator |
| Township / Ward | Philadelphia |
| Est. Birth Year | ~1912 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Dempsey | Spouse | — | 58 | ~1882 |
| Kathleen Dempsey | Daughter | — | 18 | ~1922 |
| Andrew Dempsey | Son | — | 22 | ~1918 |
| Joseph Dempsey | Son | — | 19 | ~1921 |
| Mary Dempsey | Daughter | — | 28 | ~1912 |
| Anna Dempsey | Daughter | — | 25 | ~1915 |
| Martin Dempsey | Son | — | 27 | ~1913 |
| Andrew Dempsey | Head | — | 57 | ~1883 |
Census Appearances
1930
Philadelphia, Pennsylvania
Daughter, age 18
Philadelphia, Pennsylvania · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Looper |
| Industry | Hosiery Mill |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Philadelphia-County, Pennsylvania
Daughter, age 28
Philadelphia-County, Pennsylvania · implied b. ~1912 — 8 household members
| Surname | Dempsey |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | Philadelphia |
| Occupation | Telephone operator |
| Industry | Telephone company |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1144 |
| Highest Grade | H-4 |
| 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 Mary Dempsey across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Dempsey
Daughter · 1940 · age 28 · b. ~1912 · Pennsylvania
★ You are viewing this record
Sibling
Andrew Dempsey
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kathleen Dempsey
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Dempsey
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Dempsey
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martin Dempsey
Sibling · 1940 · age 27
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
39 people indexed on this census page (nara:1940:m-t0627-03736-00224)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Frances V. Jackson | 38 | Wife | — | Pennsylvania |
| 42 | Mary A. Jackson | 9 | Daughter | — | Pennsylvania |
| 43 | Howard A. Jr. Jackson | 6 | Son | — | Pennsylvania |
| 44 | Mary H. Kelly | 68 | Mother-in-law | — | West Virginia |
| 45 | Frank J. Mccormick | 42 | Brother-in-law | Salesman | Pennsylvania |
| 46 | Joseph A. Haubrich | 64 | Head | Baker | Germany |
| 47 | Elizabeth M. Haubrich | 62 | Wife | — | Pennsylvania |
| 48 | Elizabeth L. Haubrich | 36 | Daughter | Caker | Pennsylvania |
| 49 | Joseph W. Haubrich | 33 | Son | — | Pennsylvania |
| 50 | Katherine C. Guinan | 74 | Head | — | Pennsylvania |
| 51 | Florence T. Guinan | 35 | Daughter | Secretary | Pennsylvania |
| 52 | John F. Collins | 36 | Head | Driller | Pennsylvania |
| 53 | Pauline F. Collins | 34 | Wife | — | Massachusetts |
| 54 | Dorothy Collins | 9 | Daughter | — | Pennsylvania |
| 55 | Pauline Collins | 8 | Daughter | — | Pennsylvania |
| 56 | Mary Collins | 6 | Daughter | — | Pennsylvania |
| 57 | Jean Collins | 3 | Daughter | — | Pennsylvania |
| 58 | Edward T. Mcdonnell | 35 | Head | Fire Lieutenant | Pennsylvania |
| 59 | Helen F. Mcdonnell | 36 | Wife | — | Pennsylvania |
| 60 | Edward T. Mcdonnell | 13 | Son | — | Pennsylvania |
| 61 | Frances J. Mcdonnell | 11 | Daughter | — | Pennsylvania |
| 62 | Helen B. Mcdonnell | 10 | Daughter | — | Pennsylvania |
| 63 | Anne V. Mcdonnell | 9 | Daughter | — | Pennsylvania |
| 64 | Agnes Mcdonnell | 7 | Daughter | — | Pennsylvania |
| 65 | Thomas Mcdonnell | 3 | Son | — | Pennsylvania |
| 66 | Marie Mcdonnell | 1 | Daughter | — | Pennsylvania |
| 67 | Bridget M. Mcdonnell | 74 | Mother | — | Ireland |
| 69 | David L. Tait | 52 | Head | Steward | Pennsylvania |
| 70 | Rena V. Tait | 63 | Wife | — | Maryland |
| 71 | Helen A. Strehlau | 26 | Daughter | — | Pennsylvania |
| 72 | Eli E. Flynn | 2 | Grandson | — | Pennsylvania |
| 73 | Andrew J. Dempsey | 57 | Head | Chauffeur | Pennsylvania |
| 74 | Mary B. Dempsey | 58 | Wife | — | New Jersey |
| 75 | Mary M. Dempsey THIS PERSON | 28 | Daughter | Telephone Operator | Pennsylvania |
| 76 | Martin J. Dempsey | 27 | Son | Radio Inspector | Pennsylvania |
| 77 | Anna M. Dempsey | 25 | Daughter | Machine Operator | Pennsylvania |
| 78 | Andrew M. Dempsey | 22 | Son | Machinist Helper | Pennsylvania |
| 79 | Joseph A. Dempsey | 19 | Son | New Worker | Pennsylvania |
| 80 | Kathleen M. Dempsey | 18 | 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)