ML
Mary Lambert — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Lambert across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Thomas & Jane — first a daughter (b.~1886), then head of a 4-person household.
Age 54
b. ~1886
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Lambert |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 54 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | clerk |
| Industry | rubber |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1100 |
| Highest Grade | G-8 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Clerk |
| Township / Ward | Medford City |
| Est. Birth Year | ~1886 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Lambert | Daughter | — | 54 | ~1886 |
| Margaret Lambert | Daughter | — | 42 | ~1898 |
| Ada Lambert | Daughter | — | 52 | ~1888 |
| Jane Lambert | Head | — | 74 | ~1866 |
Census Appearances
1920
Middlesex, Massachusetts
Daughter, age 32
Middlesex, Massachusetts · implied b. ~1888 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lambert |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Massachusetts |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Daughter, age 44
Middlesex, Massachusetts · implied b. ~1886 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lambert |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 44 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Poland |
| Mother's Birthplace | Irish Free State |
| Occupation | Stenographer |
| Industry | Rubber Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 54
Middlesex-County, Massachusetts · implied b. ~1886 — 4 household members
| Surname | Lambert |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 54 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Occupation | clerk |
| Industry | rubber |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1100 |
| Highest Grade | G-8 |
| 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 Mary Lambert across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Thomas Lambert (~0.92 confidence) and mother Jane Lambert (~0.92 confidence) and mother Alice Lambert (~0.92 confidence) and mother Jane Lambert (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Thomas Lambert
b. ~1847
Source father
● Household
· direct · ~0.92
Mother
Jane Lambert
b. ~1852
Source mother
● Household
· direct · ~0.92
Mother
Alice Lambert
b. ~1858
Source mother
● Household
· direct · ~0.92
Mother
Jane Lambert
b. ~1866
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Lambert
Daughter · 1940 · age 54 · b. ~1886 · Massachusetts
★ You are viewing this record
Sibling
Ada Lambert
Sibling · 1940 · age 52
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Lambert
Sibling · 1940 · age 42
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-t0627-01612-00819)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mildred A Ryan | 34 | daughter | Bookkeeper | Massachusetts |
| 2 | James F Canning | 57 | head | Photographer | Massachusetts |
| 3 | Margaret E Canning | 53 | wife | — | Massachusetts |
| 4 | George F Canning | 24 | son | Claim Agent | Massachusetts |
| 5 | Lorraine Canning | 18 | daughter | New Worker | Massachusetts |
| 6 | David Canning | 16 | son | — | Massachusetts |
| 7 | William Troupe | 34 | head | Salesman | England |
| 8 | Edith Troupe | 34 | wife | — | Massachusetts |
| 9 | William Troupe | 7 | son | — | Massachusetts |
| 10 | Victor Peterson | 71 | lodger | Metal Miller | Sweden |
| 11 | James Steeves | 64 | head | Tavernman | Canada Eng |
| 12 | Josephine Steeves | 62 | wife | — | Ireland |
| 13 | Walter Goggin | 55 | head | — | Massachusetts |
| 14 | Bernadette Goggin | 49 | wife | — | Canada Eng |
| 15 | Marjorie Goggin | 19 | daughter | — | Massachusetts |
| 16 | Eleanor Goggin | 17 | daughter | — | Massachusetts |
| 17 | Virginia Goggin | 15 | daughter | — | Massachusetts |
| 18 | Helen Riley | 44 | sister | Box Maker | Massachusetts |
| 19 | Alden Scott | 28 | head | Recorder | Maine |
| 20 | Ruth E Scott | 25 | wife | — | Massachusetts |
| 21 | Jane E Lambert | 74 | head | — | Ireland |
| 22 | Mary Lambert THIS PERSON | 54 | daughter | Clerk | Massachusetts |
| 23 | Ada Lambert | 52 | daughter | — | Massachusetts |
| 24 | Margaret Lambert | 42 | daughter | Bookkeeper | Massachusetts |
| 25 | Katherine Shea | 53 | head | — | Massachusetts |
| 26 | Alice L Shea | 33 | daughter | Stenographer | Massachusetts |
| 27 | Hazel Shea | 32 | daughter | Cancellation Clerk | Massachusetts |
| 28 | William Shea | 26 | son | Longshoreman | Massachusetts |
| 29 | William Shea | 11 | grandson | — | Massachusetts |
| 30 | Martha Watts | 67 | head | — | England |
| 31 | Mary G Watts | 35 | daughter | Stenographer | Massachusetts |
| 32 | Mildred Watts | 32 | daughter | Stenographer | Massachusetts |
| 33 | Frank Whitman | 66 | head | Supervision | Canada |
| 34 | Jean Whitman | 22 | daughter | — | Massachusetts |
| 35 | Wesley Tourtellotte | 34 | son-in-law | Manager | Massachusetts |
| 36 | Flora Harris | 40 | head | Bookkeeper | Massachusetts |
| 37 | Flora Harris | 38 | sister | Nurse | Massachusetts |
| 38 | Frederick Merrill | 41 | head | Truck Driver | Massachusetts |
| 39 | Lillian Merrill | 37 | wife | — | Massachusetts |
| 40 | Edwina Chandler | 15 | daughter | — | New Orleans |
Pedigree Summary
Mary + 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)