WM
William Martin — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this William Martin across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Edward & William — first a son (b.~1913), then head of a 7-person household.
Age 27
b. ~1913
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Martin |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Cambridge City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Library Assistant |
| Industry | City Library |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 1327 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Library Assistant |
| Township / Ward | Cambridge City |
| Est. Birth Year | ~1913 |
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 |
|---|---|---|---|---|
| Margaret Martin | Daughter | — | 24 | ~1916 |
| Anna Martin | Daughter | — | 25 | ~1915 |
| Edward Martin | Head | — | 74 | ~1866 |
| Raymond Martin | Son | — | 19 | ~1921 |
| James Martin | Son | — | 23 | ~1917 |
| Edward Martin | Son | — | 21 | ~1919 |
| William Martin | Son | — | 27 | ~1913 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 6
Middlesex, Massachusetts · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Martin |
| Given Name | William J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Rhode Island |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 16
Middlesex, Massachusetts · implied b. ~1914 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Martin |
| Given Name | William J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Rhode Island |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 27
Middlesex-County, Massachusetts · implied b. ~1913 — 7 household members
| Surname | Martin |
| Given Name | William J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Cambridge City |
| 1935 Residence (County) | Middlesex |
| Occupation | Library Assistant |
| Industry | City Library |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 1327 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same House |
| 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 Martin across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Edward Martin (~0.92 confidence) and father William Martin (~0.92 confidence) and mother Lena Martin (~0.92 confidence) and mother Lena Martin (~0.92 confidence) and mother Margaret Wild (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Edward Martin
b. ~1866
Source father
● Household
· direct · ~0.92
Father
William Martin
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Lena Martin
b. ~1876
Source mother
● Household
· direct · ~0.92
Mother
Lena Martin
b. ~1877
Source mother
● Household
· direct · ~0.92
Mother
Margaret Wild
b. ~1872
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Martin
Son · 1940 · age 27 · b. ~1913 · Massachusetts
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Sibling
Edward Martin
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Martin
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Martin
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Martin
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Martin
Sibling · 1940 · age 24
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-t0627-01683-00674)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Alfred Bishop | 41 | Lodger | Carpenter | Vermont |
| 2 | Florence Bishop | 42 | Lodger | — | New York |
| 3 | Joseph H. Whitehouse | 73 | Lodger | — | Nova Scotia |
| 4 | Mabel E. Whitehouse | 63 | Lodger | — | Massachusetts |
| 5 | Myles Page | 28 | Head | Foreman | Massachusetts |
| 6 | Marion Page | 30 | Wife | — | Massachusetts |
| 7 | Dorothy Page | 0 | Daughter | — | Massachusetts |
| 8 | Eileen Healey | 35 | Head | — | Massachusetts |
| 9 | Ruth Healey | 5 | Daughter | — | Massachusetts |
| 10 | Robert Healey | 5 | Daughter | — | Massachusetts |
| 11 | Harry A. Kidney | 59 | Lodger | Foreman | Massachusetts |
| 12 | James P. Connolly | 41 | Lodger | Steam Fitter | Massachusetts |
| 13 | Ethel F. Connolly | 35 | Lodger | — | Maine |
| 14 | Dorothy Lamonthe | 18 | Lodger | Sticker | Massachusetts |
| 15 | James Beard | 35 | Lodger | Roofer | Canada English |
| 16 | Edward J. Martin | 74 | Head | — | Massachusetts |
| 17 | William J. Martin THIS PERSON | 27 | Son | Library Assistant | Massachusetts |
| 18 | Anna L. Martin | 25 | Daughter | Secretary | Massachusetts |
| 19 | Margaret M. Martin | 24 | Daughter | — | Massachusetts |
| 20 | James B. Martin | 23 | Son | Salesman | Massachusetts |
| 21 | Edward J. Martin | 21 | Son | Laborer | Massachusetts |
| 22 | Raymond C. Martin | 19 | Son | — | Massachusetts |
| 23 | Peter E. Flynn | 48 | Head | Salesman | Massachusetts |
| 24 | Mary D. Flynn | 43 | Wife | — | Massachusetts |
| 25 | Peter E. Jr. Flynn | 11 | Son | — | Massachusetts |
| 26 | Julia E. Ricker | 84 | Head | — | Massachusetts |
| 27 | Katherine V. Collins | 43 | Lodger | Bookkeeper | Massachusetts |
| 28 | Ralph W. Chapman | 59 | Head | Machinist | Massachusetts |
| 29 | Katherine Chapman | 58 | Wife | — | Canada English |
| 30 | Gertrude Chapman | 18 | Daughter | — | Massachusetts |
| 31 | Ralph Chapman | 17 | Son | — | Massachusetts |
| 32 | Lillian Chapman | 16 | Daughter | — | Massachusetts |
| 33 | Lorraine Chapman | 9 | Daughter | — | Massachusetts |
| 34 | William J. Stanger | 55 | Head | Gas Fitting Inspector | Massachusetts |
| 35 | Edith M. Stanger | 55 | Wife | — | Canada English |
| 36 | William J. Jr. Stanger | 27 | Son | Truck Driver | Massachusetts |
| 37 | Gertrude F. Stanger | 26 | Daughter | Saleswoman | Massachusetts |
| 38 | Edna Poole | 71 | Head | — | Maine |
| 39 | Margaret G. Bender | 25 | Lodger | Compositor | Massachusetts |
| 40 | Laura M. Clarke | 40 | Lodger | Proof Reader | New Hampshire |
Pedigree Summary
William + 5 siblings
Gen 1 · 5 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)