MD
Mary Dempsey — 1940 US Census Record
Model Tree available1940 United States Federal Census · Lackawanna-County, Pennsylvania
Our Model Tree links this Mary Dempsey across the 1910, 1920, 1930 and 1940 US Censuses in Lackawanna-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Martin & Ann — first a daughter (b.~1908), then head of a 4-person household.
Age 32
b. ~1908
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lackawanna-County, Pennsylvania |
| Surname | Dempsey |
| Given Name | Mary D. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Olyphant borough |
| 1935 Residence (County) | Lackawanna |
| Additional Details | |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | GW |
| Hours Worked | 24 |
| Income (1939) | 1400 |
| Highest Grade | C 2 |
| 1935 Residence | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Teacher |
| Township / Ward | Olyphant Borough |
| Est. Birth Year | ~1908 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Francis Dempsey | Son | — | 36 | ~1904 |
| Bridget Dempsey | Spouse | — | 60 | ~1880 |
| Mary Dempsey | Daughter | — | 32 | ~1908 |
| Martin Dempsey | Head | — | 65 | ~1875 |
Census Appearances
1910
Lackawanna, Pennsylvania
Daughter, age 1
Lackawanna, Pennsylvania · implied b. ~1909 — 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 | 1 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1920
Lackawanna, Pennsylvania
Daughter, age 12
Lackawanna, Pennsylvania · implied b. ~1908 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Lackawanna, Pennsylvania
Daughter, age 22
Lackawanna, Pennsylvania · implied b. ~1908 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Lackawanna-County, Pennsylvania
Daughter, age 32
Lackawanna-County, Pennsylvania · implied b. ~1908 — 4 household members
| Surname | Dempsey |
| Given Name | Mary D. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Olyphant borough |
| 1935 Residence (County) | Lackawanna |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | GW |
| Hours Worked | 24 |
| Income (1939) | 1400 |
| Highest Grade | C 2 |
| 1935 Residence | Pennsylvania |
| 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 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Martin Dempsey (~0.92 confidence) and mother Ann Dempsey (~0.92 confidence) and mother Annie Dempsey (~0.92 confidence) and mother Bridget Dempsey (~0.92 confidence) and father Patrick Dempsey (~0.92 confidence) and mother Esther Dempsey (~0.92 confidence) and father Joseph Dempsey (~0.92 confidence). The pedigree spans 1 generation with 7 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Martin Dempsey
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Ann Dempsey
b. ~1877
Source mother
● Household
· direct · ~0.92
Mother
Annie Dempsey
b. ~1879
Source mother
● Household
· direct · ~0.92
Mother
Bridget Dempsey
b. ~1880
Source mother
● Household
· direct · ~0.92
Father
Patrick Dempsey
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Esther Dempsey
b. ~1889
Source mother
● Household
· direct · ~0.92
Father
Joseph Dempsey
b. ~1889
Source father
● Household
· direct · ~0.92
This person
Anchor record
Mary Dempsey
Daughter · 1940 · age 32 · b. ~1908 · Pennsylvania
★ You are viewing this record
Sibling
Francis Dempsey
Sibling · 1940 · age 36
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 — Lackawanna-County, Pennsylvania
Open full size
1940 US Federal Census — Lackawanna-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03526-00334)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Charles E. Gibbons | 40 | Brother | File Clerk | Pennsylvania |
| 2 | Frank J. Gibbons | 34 | Head | Proprietor | Pennsylvania |
| 3 | Mary B. Gibbons | 32 | Wife | Teacher | Pennsylvania |
| 4 | James W. Loftus | 45 | Head | Salesman | Pennsylvania |
| 5 | Clare R. Loftus | 42 | Wife | — | Pennsylvania |
| 6 | Timothy P. Loftus | 18 | Son | File Clerk | Pennsylvania |
| 7 | James Loftus | 14 | Son | — | Pennsylvania |
| 8 | Ann Loftus | 5 | Daughter | — | Pennsylvania |
| 9 | Elizabeth G. Dempsey | 58 | Head | — | Pennsylvania |
| 10 | Mary E. Dempsey | 60 | Sister | Seamstress | Pennsylvania |
| 11 | Frank Convey | 57 | Head | Laborer | Pennsylvania |
| 12 | Ada K. Convey | 64 | Wife | — | England |
| 13 | John A. Dempsey | 53 | Head | Superintendent | Pennsylvania |
| 14 | Mary L. Dempsey | 49 | Wife | — | Pennsylvania |
| 15 | James J. Casey | 69 | Head | Mason | Pennsylvania |
| 16 | Mary A. Casey | 65 | Wife | — | Pennsylvania |
| 17 | Frank M. Mccarthy | 40 | Son-in-law | Salesman | Pennsylvania |
| 18 | Marion A. Mccarthy | 38 | Daughter | — | Pennsylvania |
| 19 | Frank J. Mccarthy | 14 | Grandson | — | Pennsylvania |
| 20 | James L. Mccarthy | 11 | Grandson | — | Pennsylvania |
| 21 | Mary K. Mccarthy | 9 | Granddaughter | — | Pennsylvania |
| 22 | Clara Mccarthy | 7 | Granddaughter | — | Pennsylvania |
| 23 | Joseph Mccarthy | 6 | Grandson | — | Pennsylvania |
| 24 | Grace Mccarthy | 1 | Granddaughter | — | Pennsylvania |
| 25 | Bridget E. Hastings | 72 | Head | — | Pennsylvania |
| 26 | Ann Hastings | 39 | Daughter | Teacher | Pennsylvania |
| 27 | Andrew P. Hastings | 36 | Son | Teacher | Pennsylvania |
| 28 | Jean M. Nicholas | 34 | Head | — | Pennsylvania |
| 29 | Joseph J. Nicholas | 30 | Husband | Laborer | Pennsylvania |
| 30 | Jean Nicholas | 4 | Daughter | — | Pennsylvania |
| 31 | Martin M. Mchale | 36 | Head | File Clerk | Pennsylvania |
| 32 | Marjorie B. Mchale | 33 | Wife | — | Pennsylvania |
| 33 | Paul H. Mchale | 14 | Son | — | Pennsylvania |
| 34 | Joan Mchale | 1 | Daughter | — | Pennsylvania |
| 35 | Martin H. Dempsey | 65 | Head | — | Pennsylvania |
| 36 | Bridget A. Dempsey | 60 | Wife | — | Pennsylvania |
| 37 | Francis J. Dempsey | 36 | Son | Cashier | Pennsylvania |
| 38 | Mary D. Dempsey THIS PERSON | 32 | Daughter | Teacher | Pennsylvania |
| 39 | Thomas J. Mchale | 53 | Head | Laborer | Pennsylvania |
| 40 | Mary A. Mchale | 52 | Wife | — | Pennsylvania |
Pedigree Summary
Mary + 1 sibling
Gen 1 · 7 parents
~0.92
Max depth 4 (1900–1950 window)
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)