MD
Mary Donnelly — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Mary Donnelly across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1911), then head of a 8-person household.
Age 29
b. ~1911
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Donnelly |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | SUFFOLK |
| Additional Details | |
| Occupation | Secretary |
| Industry | Dry goods |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 884 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Secretary |
| Township / Ward | Boston 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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Theresa Donnelly | Daughter | — | 13 | ~1927 |
| Mary Donnelly | Daughter | — | 29 | ~1911 |
| Alice Donnelly | Daughter | — | 25 | ~1915 |
| Sarah Donnelly | Head | — | 53 | ~1887 |
| Bernard Donnelly | Son | — | 13 | ~1927 |
| James Donnelly | Son | — | 19 | ~1921 |
| Edward Donnelly | Son | — | 21 | ~1919 |
| Thomas Donnelly | Son | — | 13 | ~1927 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 19
Suffolk, Massachusetts · implied b. ~1911 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Donnelly |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | Stenographer |
| Industry | Plumbing Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 29
Suffolk-County, Massachusetts · implied b. ~1911 — 8 household members
| Surname | Donnelly |
| Given Name | Mary M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | SUFFOLK |
| Occupation | Secretary |
| Industry | Dry goods |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 884 |
| Highest Grade | Hs 4 |
| 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 Donnelly across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Donnelly
Daughter · 1940 · age 29 · b. ~1911 · Massachusetts
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Sibling
Bernard Donnelly
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Donnelly
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Donnelly
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Donnelly
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Donnelly
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Theresa Donnelly
Sibling · 1940 · age 13
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 — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01668-00505)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Nicholas J. Mulcahy | 57 | Head | Attendant | Massachusetts |
| 42 | Winifred M. Mulcahy | 49 | Wife | Telephone Operator | Massachusetts |
| 43 | Mary V. Mulcahy | 13 | Daughter | — | Massachusetts |
| 44 | Winifred M. Mulcahy | 11 | Daughter | — | Massachusetts |
| 45 | Paul Mulcahy | 9 | Son | — | Massachusetts |
| 46 | James H. Fitzgerald | 74 | Head | — | Massachusetts |
| 47 | Mary L. Fitzgerald | 72 | Wife | — | Massachusetts |
| 48 | Ellen O'Brien | 60 | Head | — | Massachusetts |
| 49 | Timothy G. Bulman | 52 | Head | Sewing Machine | Irish Free State |
| 50 | Mary B. Bulman | 39 | Wife | Stationary Engineer | Ireland |
| 51 | Mary A. Bulman | 16 | Daughter | — | Massachusetts |
| 52 | Frances L. Bulman | 15 | Daughter | — | Massachusetts |
| 53 | Thomas J. Bulman | 13 | Son | — | Massachusetts |
| 54 | Russell G. Bulman | 11 | Son | — | Massachusetts |
| 55 | Eleanor C. Bulman | 8 | Daughter | — | Massachusetts |
| 56 | Alfred F. Bulman | 7 | Son | — | Massachusetts |
| 57 | Elizabeth A. Bulman | 5 | Daughter | — | Massachusetts |
| 58 | Claire V. Bulman | 3 | Daughter | — | Massachusetts |
| 59 | Paul P. Bulman | 1 | Son | — | Massachusetts |
| 60 | Sarah H. Donnelly | 53 | Head | — | Ireland |
| 61 | Mary M. Donnelly THIS PERSON | 29 | Daughter | Secretary | Massachusetts |
| 62 | Alice R. Donnelly | 25 | Daughter | Stenographer | Massachusetts |
| 63 | Edward B. Donnelly | 21 | Son | Store Clerk | Massachusetts |
| 64 | James J. Donnelly | 19 | Son | Store Clerk | Massachusetts |
| 65 | Bernard R. Donnelly | 13 | Son | — | Massachusetts |
| 66 | Thomas F. Donnelly | 13 | Son | — | Massachusetts |
| 67 | Theresa H. Donnelly | 13 | Daughter | — | Massachusetts |
| 68 | Francis C. White | 39 | Head | Street Inspector | Massachusetts |
| 69 | Kathleen G. White | 44 | Wife | — | Massachusetts |
| 70 | Kathleen White | 13 | Daughter | — | Massachusetts |
| 71 | Marie H. White | 11 | Daughter | — | Massachusetts |
| 72 | Dorothy White | 9 | Daughter | — | Massachusetts |
| 73 | Patrick H. Rogan | 47 | Lodger | — | Massachusetts |
| 74 | Thomas D. Sullivan | 68 | Head | Maintenance Man | Ireland |
| 75 | Annie M. Sullivan | 57 | Wife | — | Ireland |
| 76 | Agnes T. Sullivan | 32 | Daughter | — | Massachusetts |
| 77 | Catherine J. Sullivan | 29 | Daughter | Stenographer | Massachusetts |
| 78 | Rita A. Sullivan | 26 | Daughter | Secretary | Massachusetts |
| 79 | Thomas J. Sullivan | 23 | Son | Elec Engineer | Massachusetts |
| 80 | Jeremiah X. Sullivan | 21 | Son | — | 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)