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Mary Monahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Worcester-County, Massachusetts
Our Model Tree links this Mary Monahan across the 1930 and 1940 US Censuses in Worcester-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1915), then head of a 8-person household.
Age 25
b. ~1915
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Worcester-County, Massachusetts |
| Surname | Monahan |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Worcester City |
| 1935 Residence (County) | Worcester |
| Additional Details | |
| Occupation | General office work |
| Industry | Factory office |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1000 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | General Office Work |
| Township / Ward | Worcester City |
| Est. Birth Year | ~1915 |
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 |
|---|---|---|---|---|
| Dorothy Monahan | Daughter | — | 20 | ~1920 |
| Clare Monahan | Daughter | — | 11 | ~1929 |
| Mary Monahan | Daughter | — | 25 | ~1915 |
| John Monahan | Son | — | 22 | ~1918 |
| Winifred Monahan | Daughter | — | 23 | ~1917 |
| Elizabeth Monahan | Spouse | — | 55 | ~1885 |
| John Monahan | Head | — | 56 | ~1884 |
| Paul Monahan | Son | — | 15 | ~1925 |
Census Appearances
1930
Worcester, Massachusetts
Daughter, age 14
Worcester, Massachusetts · implied b. ~1916 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Monahan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Worcester-County, Massachusetts
Daughter, age 25
Worcester-County, Massachusetts · implied b. ~1915 — 8 household members
| Surname | Monahan |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Worcester City |
| 1935 Residence (County) | Worcester |
| Occupation | General office work |
| Industry | Factory office |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1000 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Monahan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Monahan
Daughter · 1940 · age 25 · b. ~1915 · Massachusetts
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Sibling
Dorothy Monahan
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Monahan
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Clare Monahan
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Monahan
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Winifred Monahan
Sibling · 1940 · age 23
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 — Worcester-County, Massachusetts
Open full size
1940 US Federal Census — Worcester-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01719-00203)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Helen M. Harley | 52 | Wife | Master | Massachusetts |
| 2 | Joseph Gozellin | 54 | Head | Mechanic | New Hampshire |
| 3 | Edna Gozellin | 52 | Wife | — | Maine |
| 4 | Jean C. Hopkins | 60 | Head | — | Massachusetts |
| 5 | Gilbert H. Prentice | 51 | Lodger | — | Massachusetts |
| 6 | John Monahan | 56 | Head | Storekeeper | Massachusetts |
| 7 | Elizabeth Monahan | 55 | Wife | — | Massachusetts |
| 8 | Mary C. Monahan THIS PERSON | 25 | Daughter | General Office Work | Massachusetts |
| 9 | Winifred G. Monahan | 23 | Daughter | Office Worker | Massachusetts |
| 10 | John H. Monahan | 22 | Son | Machine Operator | Massachusetts |
| 11 | Dorothy G. Monahan | 20 | Daughter | — | Massachusetts |
| 12 | Paul F. Monahan | 15 | Son | — | Massachusetts |
| 13 | Clare E. Monahan | 11 | Daughter | — | Massachusetts |
| 14 | Daniel Boylan | 37 | Head | Laborer | Massachusetts |
| 15 | Francis Boylan | 39 | Lodger | — | Massachusetts |
| 16 | Katherine Boylan | 36 | Lodger | Laundryworker | Massachusetts |
| 17 | Mary E. Boylan | 68 | Housekeeper | Housekeeper | Connecticut |
| 18 | Fred Damanell | 61 | Head | Polisher | Canada |
| 19 | Edna Damanell | 59 | Wife | — | Canada |
| 20 | Marion Damanell | 37 | Daughter | Bookkeeper | Massachusetts |
| 21 | Marjorie Damanell | 30 | Daughter | Cashier | Massachusetts |
| 22 | Thomas Monahan | 58 | Head | Foreman | Massachusetts |
| 23 | Cecilia Monahan | 51 | Wife | — | Massachusetts |
| 24 | Thomas J. Monahan | 29 | Son | Assistant Treasurer | Massachusetts |
| 25 | Francis Monahan | 27 | Son | Special Apprentice | Massachusetts |
| 26 | Harold Monahan | 24 | Son | Operator | Massachusetts |
| 27 | Aileen Monahan | 23 | Daughter | — | Massachusetts |
| 28 | Eileen Monahan | 23 | Daughter | — | Massachusetts |
| 29 | Daniel F. O'Connell | 49 | Head | Mechanical Draftsman | Massachusetts |
| 30 | Elizabeth M. O'Connell | 46 | Wife | — | Massachusetts |
| 31 | Joanne F. O'Connell | 10 | Daughter | — | Massachusetts |
| 32 | Betty Ann O'Connell | 5 | Daughter | — | Massachusetts |
| 33 | Albert Croone | 47 | Head | Tool Maker | Massachusetts |
| 34 | Gertrude Croone | 47 | Wife | Matron | Massachusetts |
| 35 | John F. Wedge | 30 | Head | Carpenter'S Helper | Massachusetts |
| 36 | Rita Wedge | 27 | Wife | — | Massachusetts |
| 37 | Mary R. Wedge | 9 | Daughter | — | Massachusetts |
| 38 | John Wedge | 6 | Son | — | Massachusetts |
| 39 | James P. Wedge | 4 | Son | — | Massachusetts |
| 40 | John F. Sr. Wedge | 61 | Father | Machinist | Massachusetts |
Related Census Records
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)