HM
Harold Martin — 1940 US Census Record
Model Tree available1940 United States Federal Census · Plymouth-County, Massachusetts
Our Model Tree links this Harold Martin across the 1920, 1930 and 1940 US Censuses in Plymouth-County, Massachusetts (XGBoost, ~Confirmed), with identified parents James & James — first a son (b.~1912), then head of a 5-person household.
Age 28
b. ~1912
Male
Son
Born: Vermont
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Plymouth-County, Massachusetts |
| Surname | Martin |
| Given Name | Harold A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Vermont |
| 1935 Residence (City) | Plymouth (part) |
| 1935 Residence (County) | Plymouth |
| Additional Details | |
| Occupation | Truck Driver |
| Industry | Fish Dealer |
| Class of Worker | PW |
| Hours Worked | 38 |
| Income (1939) | 380 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Vermont |
| Birth Country | United States |
| Birthplace (normalized) | vermont |
| Occupation | Truck Driver |
| Township / Ward | Plymouth Part |
| 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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Harold | Age | Birth yr |
|---|---|---|---|---|
| John Martin | Son | — | 26 | ~1914 |
| James Martin | Head | — | 52 | ~1888 |
| Harold Martin | Son | — | 28 | ~1912 |
| Susan Martin | Spouse | — | 50 | ~1890 |
| Carroll Martin | Son | — | 25 | ~1915 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 8
Middlesex, Massachusetts · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Martin |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Vermont |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Speaks English | Yes |
| Birth State | Vermont |
| Birth Country | United States |
| Birthplace (normalized) | vermont |
1930
Plymouth, Massachusetts
Son, age 18
Plymouth, Massachusetts · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Martin |
| Given Name | Harold A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Vermont |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Vermont |
| Birth Country | United States |
| Birthplace (normalized) | vermont |
1940
Plymouth-County, Massachusetts
Son, age 28
Plymouth-County, Massachusetts · implied b. ~1912 — 5 household members
| Surname | Martin |
| Given Name | Harold A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Vermont |
| 1935 Residence (City) | Plymouth (part) |
| 1935 Residence (County) | Plymouth |
| Occupation | Truck Driver |
| Industry | Fish Dealer |
| Class of Worker | PW |
| Hours Worked | 38 |
| Income (1939) | 380 |
| Highest Grade | H 4 |
| 1935 Residence | Same Place |
| Birth State | Vermont |
| Birth Country | United States |
| Birthplace (normalized) | vermont |
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 Martin across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage. Identified parents: father James Martin (~0.92 confidence) and father James Martin (~0.92 confidence) and mother Susan Martin (~0.92 confidence) and mother Susan Martin (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Martin
b. ~1888
Source father
● Household
· direct · ~0.92
Father
James Martin
b. ~1888
Source father
● Household
· direct · ~0.92
Mother
Susan Martin
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Susan Martin
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harold Martin
Son · 1940 · age 28 · b. ~1912 · Massachusetts
★ You are viewing this record
Sibling
John Martin
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Carroll Martin
Sibling · 1940 · age 25
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 — Plymouth-County, Massachusetts
Open full size
1940 US Federal Census — Plymouth-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01639-00732)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Eleanor B. Gardner | 17 | Daughter | — | Massachusetts |
| 2 | John F. Shea | 52 | Head | Landscape Gardener | Massachusetts |
| 3 | Mary A. Shea | 49 | Wife | — | Newfoundland |
| 4 | Francis P. Shea | 20 | Son | Accountant | Massachusetts |
| 5 | William J. Shea | 18 | Son | Usher | Massachusetts |
| 6 | George V. Shea | 16 | Son | — | Massachusetts |
| 7 | William J. O'Brien | 62 | Head | Laborer | Massachusetts |
| 8 | Alice G. O'Brien | 62 | Wife | — | Massachusetts |
| 9 | Thomas H. Price | 33 | Head | Engineer Heating | Minnesota |
| 10 | Hazel H. Price | 35 | Wife | — | Pennsylvania |
| 11 | Thomas H. Jr. Price | 5 | Son | — | Massachusetts |
| 12 | Robert D. Price | 3 | Son | — | Massachusetts |
| 13 | Sarah T. Pierce | 87 | Head | — | Massachusetts |
| 14 | Kenneth C. Atwood | 29 | Head | Salesman | Massachusetts |
| 15 | Rollene H. Atwood | 28 | Wife | — | Massachusetts |
| 16 | Bruce S. Atwood | 2 | Son | — | Massachusetts |
| 17 | Florence E. Clarke | 55 | Head | Bookkeeper | Massachusetts |
| 18 | William P. Clarke | 20 | Son | — | Massachusetts |
| 19 | Barbara Shaw | 16 | Niece | — | Massachusetts |
| 20 | Howard R. Cadman | 26 | Head | Clerk Commodity | Massachusetts |
| 21 | Ruth M. Cadman | 22 | Wife | — | Massachusetts |
| 22 | Donald H. Cadman | 4 | Son | — | Massachusetts |
| 23 | James M. Martin | 52 | Head | Grain Salesman | Massachusetts |
| 24 | Susan H. Martin | 50 | Wife | — | Massachusetts |
| 25 | Harold A. Martin THIS PERSON | 28 | Son | Truck Driver | Vermont |
| 26 | John W. Martin | 26 | Son | Mess Porter | Massachusetts |
| 27 | Carroll E. Martin | 25 | Son | Truck Driver | Massachusetts |
| 28 | Alba A. Wood | 28 | Head | Truck Driver | Massachusetts |
| 29 | Elizabeth Wood | 21 | Wife | — | Massachusetts |
| 30 | Judith A. Wood | 1 | Daughter | — | Massachusetts |
| 31 | Anthony Guidette | 59 | Head | Popcorn Vendor | Italy |
| 32 | Clementina Guidette | 54 | Wife | — | Italy |
| 33 | Lawrence F. Mansfield | 45 | Head | — | Massachusetts |
| 34 | Vilda Mansfield | 46 | Wife | — | England |
| 35 | George H. Mansfield | 19 | Son | Laborer | Massachusetts |
| 36 | Walter W. Mansfield | 17 | Son | — | Massachusetts |
| 37 | James Mansfield | 16 | Son | — | Massachusetts |
| 38 | Harold Mansfield | 15 | Son | — | Massachusetts |
| 39 | Lillian F. Mansfield | 6 | Daughter | — | Massachusetts |
| 40 | Lawrence F. Jr. Mansfield | 4 | Son | — | Massachusetts |
Pedigree Summary
Harold + 2 siblings
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)