HC
Harold Clark — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Harold Clark across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Hammond & Linwood — first a head (b.~1912), then head of a 3-person household.
Age 28
b. ~1912
Male
Head
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Clark |
| Given Name | Harold |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden city |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Secretary |
| Industry | Real Estate |
| Class of Worker | PW |
| Hours Worked | 45 |
| Income (1939) | 1350 |
| Highest Grade | H 3 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Secretary |
| Township / Ward | Malden City |
| Est. Birth Year | ~1912 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Harold | Age | Birth yr |
|---|---|---|---|---|
| Harold Clark | Son | — | 3 | ~1937 |
| Rita Clark | Spouse | — | 21 | ~1919 |
| Harold Clark | Head | — | 28 | ~1912 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 8
Middlesex, Massachusetts · implied b. ~1912 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Harold D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | New Hampshire |
| Mother's Birthplace | Maine |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 18
Middlesex, Massachusetts · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Harold D |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | New Hampshire |
| Mother's Birthplace | Maine |
| Occupation | Usher |
| Industry | Theatre |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Head, age 28
Middlesex-County, Massachusetts · implied b. ~1912 — 3 household members
| Surname | Clark |
| Given Name | Harold |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden city |
| 1935 Residence (County) | Middlesex |
| Occupation | Secretary |
| Industry | Real Estate |
| Class of Worker | PW |
| Hours Worked | 45 |
| Income (1939) | 1350 |
| Highest Grade | H 3 |
| 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 Harold Clark across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Hammond Clark (~0.92 confidence) and father Linwood Clark (~0.92 confidence) and mother Nellie Clark (~0.92 confidence) and mother Nellie Clark (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Hammond Clark
b. ~1869
Source father
● Household
· direct · ~0.92
Father
Linwood Clark
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Nellie Clark
b. ~1870
Source mother
● Household
· direct · ~0.92
Mother
Nellie Clark
b. ~1871
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harold Clark
Head · 1940 · age 28 · b. ~1912 · Massachusetts
★ You are viewing this record
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-t0627-01609-00821)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Sybil L. Grossman | 4 | Daughter | — | Massachusetts |
| 42 | Hettie Griffiths | 45 | Lodger | Housekeeper | Massachusetts |
| 43 | James Brusnick | 45 | Head | Itheosmist|Itheosonist | Russia |
| 44 | Rebecca Brusnick | 43 | Wife | — | Russia |
| 45 | Bernard Brusnick | 21 | Son | Itheosmist|Itheosonist | Massachusetts |
| 46 | Iris Brusnick | 17 | Daughter | — | Massachusetts |
| 47 | Irving Brusnick | 12 | Son | — | Massachusetts |
| 48 | Richard Richmond | 23 | Head | Clerk | Massachusetts |
| 49 | Alice Richmond | 23 | Wife | Salesgirl | Massachusetts |
| 50 | Nathan Wineblood | 30 | Head | Counter Inspector | New Hampshire |
| 51 | Pearl E. Wineblood | 27 | Wife | — | Massachusetts |
| 52 | Herbert Wineblood | 5 | Son | — | Massachusetts |
| 53 | Isaac Hussey | 36 | Head | Iron Worker | Canada-English |
| 54 | Rose G. Hussey | 30 | Wife | — | Canada-English |
| 55 | Violet Hussey | 11 | Daughter | — | Massachusetts |
| 56 | William Hussey | 10 | Son | — | Massachusetts |
| 57 | Robert Hussey | 6 | Son | — | Massachusetts |
| 58 | Richard Hussey | 3 | Son | — | Massachusetts |
| 59 | Gustaf W. Johnson | 82 | Head | — | Sweden |
| 60 | Hannah M. Johnson | 79 | Wife | — | Sweden |
| 61 | Herbert Johnson | 43 | Son | Owner | Massachusetts |
| 62 | Oliver Johnson | 41 | Son | Owner | Massachusetts |
| 63 | Harold Clark THIS PERSON | 28 | Head | Secretary | Massachusetts |
| 64 | Rita Clark | 21 | Wife | — | Massachusetts |
| 65 | Harold J. Clark | 3 | Son | — | Massachusetts |
| 66 | Edward Alper | 42 | Head | Partner | Russia |
| 67 | Hilda Alper | 38 | Wife | Furnier | Russia |
| 68 | Emma Alper | 72 | Mother | — | Russia |
| 69 | Celia Book | 57 | Head | — | Russia |
| 70 | Jack Godfrey | 38 | Son-in-law | Manager | Pennsylvania |
| 71 | Louise Godfrey | 31 | Daughter | — | Russia |
| 72 | Dorothy Godfrey | 12 | Granddaughter | — | Massachusetts |
| 73 | Benjamin Hutnick | 38 | Nephew | Cutter | Russia |
| 74 | George Clayman | 28 | Nephew | Cutter | Massachusetts |
| 75 | Willie Hinton | 67 | Head | Auto Wrecker | North Carolina |
| 76 | Idah Hinton | 73 | Wife | — | North Carolina |
| 77 | Annie Talbot | 66 | Head | — | Canada-English |
| 78 | Ralph Talbot | 30 | Son | Helper | Massachusetts |
| 79 | Helen Talbot | 27 | Daughter | Bookkeeper | Massachusetts |
| 80 | Gertrude Talbot | 22 | Daughter | — | Massachusetts |
Pedigree Summary
Harold
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 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)