DC
Donald Clark — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Donald Clark across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 11-person household.
Age 11
b. ~1929
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Clark |
| Given Name | Donald |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lowell City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Lowell City |
| Est. Birth Year | ~1929 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Donald | Age | Birth yr |
|---|---|---|---|---|
| Delmore Clark | Son | — | 13 | ~1927 |
| James Clark | Head | — | 48 | ~1892 |
| Raymond Clark | Son | — | 17 | ~1923 |
| Edna Clark | Spouse | — | 48 | ~1892 |
| Elizabeth Clark | Daughter | — | 18 | ~1922 |
| William Clark | Son | — | 20 | ~1920 |
| Ruth Clark | Daughter | — | 6 | ~1934 |
| Donald Clark | Son | — | 11 | ~1929 |
| James Clark | Son | — | 26 | ~1914 |
| Charlotte Clark | Daughter | — | 8 | ~1932 |
| Harold Clark | Son | — | 23 | ~1917 |
Census Appearances
1930
Middlesex, Massachusetts
Son, age 1
Middlesex, Massachusetts · implied b. ~1929 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Donald F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Canada English |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 11
Middlesex-County, Massachusetts · implied b. ~1929 — 11 household members
| Surname | Clark |
| Given Name | Donald |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lowell City |
| 1935 Residence (County) | Middlesex |
| Highest Grade | No 6 |
| 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 Donald Clark across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Donald Clark
Son · 1940 · age 11 · b. ~1929 · Massachusetts
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Sibling
Ruth Clark
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Clark
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Delmore Clark
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Clark
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Clark
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charlotte Clark
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harold Clark
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Clark
Sibling · 1940 · age 20
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
40 people indexed on this census page (nara:1940:m-t0627-01694-00680)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William Mcclure | 33 | Head | — | Pennsylvania |
| 2 | Mary Mcclure | 30 | Wife | — | Eire |
| 3 | Ethel Mcclure | 3 | Daughter | — | Colorado |
| 4 | Leo Gagnon | 43 | Head | Waitress | Massachusetts |
| 5 | Loretta Gagnon | 46 | Wife | — | Massachusetts |
| 6 | Gladys Gagnon | 21 | Daughter | Clerk | Massachusetts |
| 7 | Marcelle Gagnon | 13 | Son | — | Massachusetts |
| 8 | Agnes Peverill | 66 | Head | — | Scotland |
| 9 | Joseph Peverill | 22 | Son | Trucker | Massachusetts |
| 10 | Elizabeth Davidson | 44 | Head | Drawer In | England |
| 11 | Mary Davidson | 75 | Mother | — | England |
| 12 | Annie Ruiter | 52 | Head | — | New Hampshire |
| 13 | Emma Ruiter | 27 | Daughter | Assembler | Massachusetts |
| 14 | Asa Ruiter | 24 | Son | Helper | Massachusetts |
| 15 | Henry E. Ruiter | 22 | Son | Helper | Massachusetts |
| 16 | Mildred Ruiter | 20 | Daughter | New Worker | Massachusetts |
| 17 | Charles Ruiter | 18 | Son | — | Massachusetts |
| 18 | Thomas Higginbottom | 74 | Head | Shipper | England |
| 19 | Kay Higginbottom | 75 | Wife | — | England |
| 20 | James Clark | 48 | Head | Dyer | Massachusetts |
| 21 | Edna Clark | 48 | Wife | — | Nova Scotia |
| 22 | James Clark | 26 | Son | Dyer | Massachusetts |
| 23 | Harold Clark | 23 | Son | Finisher | Massachusetts |
| 24 | William Clark | 20 | Son | Dyer | Massachusetts |
| 25 | Raymond Clark | 17 | Son | Clerk | Massachusetts |
| 26 | Elizabeth Clark | 18 | Daughter | — | Massachusetts |
| 27 | Delmore Clark | 13 | Son | — | Massachusetts |
| 28 | Donald Clark THIS PERSON | 11 | Son | — | Massachusetts |
| 29 | Charlotte Clark | 8 | Daughter | — | Massachusetts |
| 30 | Ruth Clark | 6 | Daughter | — | Massachusetts |
| 31 | George A. Powers | 59 | Head | Watchman | Massachusetts |
| 32 | Catherine Powers | 57 | Wife | — | Massachusetts |
| 33 | Elizabeth Powers | 22 | Daughter | Repairer | Massachusetts |
| 34 | Michael Donnelly | 65 | Head | — | Eire |
| 35 | Edward Donnelly | 35 | Brother | Caretaker | Massachusetts |
| 36 | Frederick Donnelly | 23 | Son | Weaver | Massachusetts |
| 37 | Arthur Donnelly | 21 | Son | Laborer | Massachusetts |
| 38 | James J. Roddy | 52 | Head | Section Hand | Massachusetts |
| 39 | Annie Roddy | 48 | Wife | — | Massachusetts |
| 40 | William Roddy | 25 | Son | Enumerator | Massachusetts |
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)