WD
William Donnelly — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this William Donnelly across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 7-person household.
Age 15
b. ~1925
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Donnelly |
| Given Name | William Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Some Place |
| 1935 Residence (County) | Some Place |
| Additional Details | |
| Highest Grade | H-1 |
| 1935 Residence | Some Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Somerville |
| Est. Birth Year | ~1925 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Mary Donnelly | Daughter | — | 9 | ~1931 |
| William Donnelly | Head | — | 49 | ~1891 |
| Dorothy Donnelly | Daughter | — | 11 | ~1929 |
| Annie Donnelly | Daughter | — | 13 | ~1927 |
| Anna Donnelly | Spouse | — | 48 | ~1892 |
| William Donnelly | Son | — | 15 | ~1925 |
| Robert Donnelly | Son | — | 23 | ~1917 |
Census Appearances
1930
Suffolk, Massachusetts
Son, age 4
Suffolk, Massachusetts · implied b. ~1926 — 13 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Donnolly |
| Given Name | William |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Newfoundland |
| Mother's Birthplace | Newfoundland |
| Occupation | none |
| Can Read/Write | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 15
Middlesex-County, Massachusetts · implied b. ~1925 — 7 household members
| Surname | Donnelly |
| Given Name | William Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Some Place |
| 1935 Residence (County) | Some Place |
| Highest Grade | H-1 |
| 1935 Residence | Some 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 William Donnelly across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Donnelly
Son · 1940 · age 15 · b. ~1925 · Massachusetts
★ You are viewing this record
Sibling
Annie Donnelly
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Donnelly
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Donnelly
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Donnelly
Sibling · 1940 · age 9
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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
28 people indexed on this census page (nara:1940:m-t0627-01704-00129)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ivor Bracilli | 29 | Head | Carpenter | Massachusetts |
| 42 | Louise Bracilli | 30 | Wife | — | Massachusetts |
| 43 | Donna G. Bracilli | 6 | Daughter | — | Massachusetts |
| 44 | Alfred J. Tullari | 32 | Head | Music Teacher | Massachusetts |
| 45 | Stella Tullari | 33 | Wife | — | England |
| 46 | Dolores Tullari | 5 | Daughter | — | Massachusetts |
| 47 | Audrey Tullari | 4 | Daughter | — | Massachusetts |
| 48 | Alfred Jr. Tullari | 1 | Son | — | Massachusetts |
| 49 | William Donnelly | 49 | Head | Salesman | Massachusetts |
| 50 | Anna Donnelly | 48 | Wife | Waitress | Massachusetts |
| 51 | Robert Donnelly | 23 | Son | Laborer | Massachusetts |
| 52 | William Jr. Donnelly THIS PERSON | 15 | Son | — | Massachusetts |
| 53 | Annie Donnelly | 13 | Daughter | — | Massachusetts |
| 54 | Dorothy Donnelly | 11 | Daughter | — | Massachusetts |
| 55 | Mary Donnelly | 9 | Daughter | — | Massachusetts |
| 56 | Thomas Nolan | 40 | Head | Carpenter | Massachusetts |
| 57 | Catherine Nolan | 40 | Wife | — | Massachusetts |
| 58 | Dorothy Nolan | 14 | Daughter | — | Massachusetts |
| 59 | Paul Nolan | 10 | Son | — | Massachusetts |
| 60 | Joseph Donahue | 50 | Head | Proprietor | Massachusetts |
| 61 | Florence Donahue | 48 | Wife | — | Massachusetts |
| 62 | Barbara Donahue | 21 | Daughter | Secretary | Massachusetts |
| 63 | Paul Donahue | 17 | Son | — | Massachusetts |
| 64 | Lorraine Donahue | 12 | Daughter | — | Massachusetts |
| 65 | Frank B. Dubble | 38 | Head | Salesman | Massachusetts |
| 66 | Edna May Dubble | 14 | Daughter | — | Massachusetts |
| 67 | Roopen Hacobian | 54 | Head | Rubber Work | Turkey |
| 68 | Rose Hacobian | 45 | Wife | — | Turkey |
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)