MH
Mary Hennessey — 1920 US Census Record
Model Tree available1920 United States Federal Census · Baltimore, Maryland
Our Model Tree links this Mary Hennessey across the 1920, 1930 and 1940 US Censuses in Baltimore, Maryland (XGBoost, ~Confirmed), with identified parents James & James — first a daughter (b.~1911), then head of a 4-person household.
Age 9
b. ~1911
Female
Daughter
Born: Maryland
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | Baltimore, Maryland |
| 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 |
| Additional Details | |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| 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 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Elizabeth Hennessey | Daughter | — | 7 | ~1913 |
| Mary Hennessey | Daughter | — | 9 | ~1911 |
| James Hennessey | Head | — | 42 | ~1878 |
| Ella Hennessey | Spouse | — | 43 | ~1877 |
Census Appearances
1920
Baltimore, Maryland
Daughter, age 9
Baltimore, Maryland · implied b. ~1911 — 4 household members
| 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 |
Daughter, age 29
Baltimore-City-County, Maryland · implied b. ~1911 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| 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 Hennessey across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Hennessy (~0.92 confidence) and father James Hennessey (~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 Hennessy
b. ~1875
Source father
● Household
· direct · ~0.92
Father
James Hennessey
b. ~1878
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 Hennessey
Daughter · 1920 · age 9 · b. ~1911 · Maryland
★ You are viewing this record
Sibling
Elizabeth Hennessey
Sibling · 1920 · age 7
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
1920 US Federal Census — Baltimore, Maryland
Open full size
1920 US Federal Census — Baltimore, Maryland
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu656unit:0399)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Cody M Belleson | 43 | Head | Riveter | Maryland |
| 52 | Ella R Belleson | 30 | Wife | — | Maryland |
| 53 | Eva G Belleson | 9 | Daughter | — | Maryland |
| 54 | Eva Bawthroop | 61 | Mother-in-law | — | Virginia |
| 55 | James P Hennessey | 42 | Head | Engineer | Maryland |
| 56 | Ella E Hennessey | 43 | Wife | — | Maryland |
| 57 | Mary A Hennessey THIS PERSON | 9 | Daughter | — | Maryland |
| 58 | Elizabeth Hennessey | 7 | Daughter | — | Maryland |
| 59 | Henry Brizmann | 67 | Head | Teamster | Germany |
| 60 | Catherine Brizmann | 57 | Wife | — | Germany |
| 61 | George Brizmann | 28 | Son | Laborer | Maryland |
| 62 | Harry H Brizmann | 23 | Son | Laborer | Maryland |
| 63 | William Brizmann | 21 | Son | Clerk | Maryland |
| 64 | Catherine Brizmann | 26 | Daughter | Cashier | Maryland |
| 65 | John De Angelis | 24 | Head | Tailor | Italy |
| 66 | Josie De Angelis | 19 | Wife | — | Italy |
| 67 | Agatino Agroi | 28 | Boarder | Tailor | Italy |
| 68 | Sophia Agroi | 19 | Boarder | — | Italy |
| 69 | Sadie Agroi | 3 | Niece | — | Maryland |
| 70 | Joseph Agroi | 1 | Nephew | — | Maryland |
| 71 | Frank A Duncan | 29 | Head | Ship Yard | English |
| 72 | Margaret Duncan | 29 | Wife | — | English |
| 73 | Muriel M Duncan | 8 | Daughter | — | Maryland |
| 74 | Allan J Duncan | 6 | Son | — | Maryland |
| 75 | Frank A Jr Duncan | 1 | Son | — | Maryland |
| 76 | Otto Kolberg | 43 | Boarder | Machine Shop | German |
| 77 | Frank Bortner | 52 | Head | Brakeman | Pennsylvania |
| 78 | Kate Bortner | 50 | Wife | — | Maryland |
| 79 | Catherine E Bortner | 19 | Daughter | — | Maryland |
| 80 | Joseph H Brown | 38 | Head | Engineer | Maryland |
| 81 | Anna Brown | 33 | Wife | — | Germany |
| 82 | John B J Lang | 47 | Head | Conductor | Maryland |
| 83 | Cora E Lang | 16 | Daughter | — | Maryland |
| 84 | Irene S Lang | 9 | Daughter | — | Maryland |
| 85 | Franklin S Lang | 7 | Son | — | Maryland |
| 86 | Evelyn S Burton | 23 | Daughter | — | Maryland |
| 87 | Preston B Burton | 20 | Son-in-law | Carpenter | Maryland |
| 88 | Cora C Burton | 0 | Granddaughter | — | Maryland |
| 89 | Edgar S White | 42 | Head | Inspector | Maryland |
| 90 | Lillian M White | 36 | Wife | — | Maryland |
| 91 | Evelyn L White | 14 | Daughter | — | Maryland |
| 92 | Mildred A White | 11 | Daughter | — | Maryland |
| 93 | Edgar S Jr White | 4 | Son | — | Maryland |
| 94 | Leslie E Creager | 36 | Head | Painter | Maryland |
| 95 | Theo H Creager | 35 | Wife | — | Maryland |
| 96 | Lorna R Creager | 15 | Daughter | — | Maryland |
| 97 | George C Creager | 10 | Son | — | Maryland |
| 98 | Harry Gustavson | 40 | Boarder | Fitter | Sweden |
| 99 | Henry J Schultheis | 62 | Head | Tailor | Germany |
| 100 | Emma X Schultheis | 53 | Wife | — | Pennsylvania |
Related Census Records
Pedigree Summary
Mary + 1 sibling
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 1920 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)