MH
Mary Hennessy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this Mary Hennessy across the 1920, 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed), with identified parents James & James — first a daughter (b.~1911), then head of a 4-person household.
Age 29
b. ~1911
Female
Daughter
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Hennessy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | BALTIMORE-CITY |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Occupation | Salesgirl |
| Industry | Retail Clothing |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 496 |
| Highest Grade | No H4 |
| 1935 Residence | Same house |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Salesgirl |
| Township / Ward | Baltimorecity |
| Est. Birth Year | ~1911 |
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 |
|---|---|---|---|---|
| James Hennessy | Head | — | 65 | ~1875 |
| Mary Hennessy | Daughter | — | 29 | ~1911 |
| Eleanor Hennessy | Spouse | — | 59 | ~1881 |
| Mary Mcadams | Other | — | 53 | ~1887 |
Census Appearances
Daughter, age 9
Baltimore, Maryland · implied b. ~1911 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hennessey |
| Given Name | Mary A |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Daughter, age 19
Baltimore, Maryland · implied b. ~1911 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hennessy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Maryland |
| Age at First Marriage | 19 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Daughter, age 29
Baltimore-City-County, Maryland · implied b. ~1911 — 4 household members
| Surname | Hennessy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | BALTIMORE-CITY |
| 1935 Residence (County) | Baltimore City |
| Occupation | Salesgirl |
| Industry | Retail Clothing |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 496 |
| Highest Grade | No H4 |
| 1935 Residence | Same house |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
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 Hennessy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Hennessey (~0.92 confidence) and father James Hennessy (~0.92 confidence) and mother Eleanor Hennessy (~0.92 confidence) and mother Ella Hennessey (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Hennessey
b. ~1878
Source father
● Household
· direct · ~0.92
Father
James Hennessy
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Eleanor Hennessy
b. ~1881
Source mother
● Household
· direct · ~0.92
Mother
Ella Hennessey
b. ~1877
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Hennessy
Daughter · 1940 · age 29 · b. ~1911 · Maryland
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Baltimore-City-County, Maryland
Open full size
1940 US Federal Census — Baltimore-City-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01508-00017)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ollie B. Crockett | 43 | Wife | — | Virginia |
| 42 | Burrel M. Crockett | 25 | Son | Clerk | Virginia |
| 43 | Julian D. Crockett | 23 | Son | Rod-Man | Maryland |
| 44 | Raymond Crockett | 21 | Son | Gardner | Maryland |
| 45 | Edward Crockett | 19 | Son | Assembly | Maryland |
| 46 | Eleanor Crockett | 16 | Daughter | — | Maryland |
| 47 | Ernest Crockett | 13 | Son | — | Virginia |
| 48 | Frank Bortner | 73 | Head | — | Maryland |
| 49 | Kate Bortner | 70 | Wife | — | Maryland |
| 50 | Katherine E. Bortner | 29 | Daughter | — | Maryland |
| 51 | Agatino Scroi | 49 | Head | Operator | Italy |
| 52 | Sophia Scroi | 39 | Wife | Button-Hole Maker | Italy |
| 53 | Phillip Scroi | 18 | Son | Spreader | Maryland |
| 54 | Anthony Scroi | 16 | Son | — | Maryland |
| 55 | Thomas Scroi | 14 | Son | — | Maryland |
| 56 | Francis Scroi | 10 | Daughter | — | Maryland |
| 57 | John Scroi | 7 | Son | — | Maryland |
| 58 | Sadie Jones | 23 | Daughter | Labeler | Maryland |
| 59 | John Jones | 31 | Son-in-law | Operator | Maryland |
| 60 | John Deangelis | 44 | Head | Operator | Italy |
| 61 | Josephine Deangelis | 38 | Wife | Button-Hole Maker | Italy |
| 62 | Elisa Deangelis | 19 | Daughter | Stenographer | Maryland |
| 63 | Marie Deangelis | 15 | Daughter | — | Maryland |
| 64 | Bertha Byrd | 63 | Head | — | Virginia |
| 65 | Parker Byrd | 40 | Son | Buyer | Maryland |
| 66 | Ella M. Hax | 68 | Boarder | — | Maryland |
| 67 | James P. Hennessy | 65 | Head | Watchman | Maryland |
| 68 | Eleanor Hennessy | 59 | Wife | — | Maryland |
| 69 | Mary Hennessy THIS PERSON | 29 | Daughter | Salesgirl | Maryland |
| 70 | Mary E. Mcadams | 53 | Sister-in-law | — | Maryland |
| 71 | Clara Jackson | 65 | Head | — | Maryland |
| 72 | Andrew Jackson | 60 | Brother | — | Maryland |
| 73 | Bob Bowman | 21 | Boarder | Operator | Maryland |
| 74 | William Mullaney | 25 | Boarder | Mechanic | New York |
| 75 | Katherine O'Brien | 78 | Head | — | Maryland |
| 76 | John H. O'Brien | 47 | Son | Shipping Clerk | Maryland |
| 77 | George Neiberlein | 23 | Grandson | Chauffer | Maryland |
| 78 | Fred Buckner | 31 | Head | Wopper | Tennessee |
| 79 | Rheta Buckner | 30 | Wife | — | Tennessee |
| 80 | Anna Buckner | 10 | Daughter | — | Tennessee |
Related Census Records
Pedigree Summary
Mary
Gen 1 · 4 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)