ML
Mary Lamb — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Lamb across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a spouse (b.~1873), then head of a 3-person household.
Age 67
b. ~1873
Female
Spouse
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Lamb |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 67 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Medford City |
| Est. Birth Year | ~1873 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| James Lamb | Head | — | 72 | ~1868 |
| Walter Lamb | Son | — | 31 | ~1909 |
| Mary Lamb | Spouse | — | 67 | ~1873 |
Census Appearances
1920
Middlesex, Massachusetts
Spouse, age 45
Middlesex, Massachusetts · implied b. ~1875 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lamb |
| Given Name | Margaret |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Other, age 55
Middlesex, Massachusetts · implied b. ~1875 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lamb |
| Given Name | Margaret M. |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Age at First Marriage | 24 |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Spouse, age 67
Middlesex-County, Massachusetts · implied b. ~1873 — 3 household members
| Surname | Lamb |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 67 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Medford City |
| 1935 Residence (County) | Middlesex |
| Highest Grade | No 8 |
| 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 Mary Lamb across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Lamb
Spouse · 1940 · age 67 · b. ~1873 · 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-t0627-01612-00040)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lorye Monroe | 31 | Head | Operator | Oregon |
| 2 | Alice Cunningham | 44 | Head | Quaintance | Massachusetts |
| 3 | Walter Cunningham | 48 | Wife | — | Rhode Island |
| 4 | John R. Cunningham | 20 | Son | Errand Boy | Boston |
| 5 | Ralph E. Cunningham | 15 | Son | — | Boston |
| 6 | Edward Ziegler | 24 | Head | Musician | Medford |
| 7 | Florence P. Ziegler | 26 | Wife | — | Wakefield |
| 8 | Arnold L. Jones | 27 | Head | Salesman | Chicago |
| 9 | Ruth M. Jones | 30 | Wife | — | Chicago |
| 10 | Barney Jones | 10 | Son | — | Chicago |
| 11 | Penny Jones | 5 | Daughter | — | Chicago |
| 12 | Leslie Jones | 4 | Son | — | Chicago |
| 13 | Ellsworth Powell | 32 | Head | Carpenter | Newfoundland |
| 14 | Alice Powell | 33 | Wife | Housewife | Newfoundland |
| 15 | Woodrow Foss | 35 | Head | Service | Stratford, N.H. |
| 16 | Teresa Foss | 25 | Wife | Book-Keeper | Concord, N.H. |
| 17 | Vincent Di Filippo | 35 | Head | Laborer | Italy |
| 18 | Jane Di Filippo | 25 | Wife | — | Portland, Me. |
| 19 | Carmine Di Filippo | 2 | Son | — | Medford |
| 20 | James Mcdowell | 59 | Head | Special Clerk | Boston |
| 21 | M. B. St. Pierre | 41 | Sister | Clerk | Medford |
| 22 | Alice St. Pierre | 15 | Daughter | Photographer | Medford |
| 23 | M. Doris Carlton | 39 | Sister | — | Medford |
| 24 | Arthur S. Carlton | 41 | Brother-in-law | — | Everett |
| 25 | Leo F. Mcnulty | 44 | Head | Spray Painter | Somerville |
| 26 | Marjorie Mcnulty | 33 | Wife | — | Somerville |
| 27 | James A. Lamb | 72 | Head | Switchman | Boston |
| 28 | Mary Lamb THIS PERSON | 67 | Wife | — | Massachusetts |
| 29 | Walter Lamb | 31 | Son | — | Boston |
| 30 | Stephen Ryan | 43 | Head | Rigger | Somerville |
| 31 | Fannie Ryan | 39 | Wife | — | Somerville |
| 32 | Muriel Ryan | 6 | Daughter | — | Medford |
| 33 | Hyman Garber | 33 | Head | Agent | Boston |
| 34 | Lillian Garber | 30 | Wife | — | Somerville |
| 35 | Norman Garber | 3 | Son | — | Medford |
| 36 | Frank Balduzzi | 28 | Head | Letterer | East Boston |
| 37 | Rose Balduzzi | 20 | Wife | — | East Boston |
| 38 | Carroll Balduzzi | 0 | Son | — | Medford |
| 39 | A. Wightman Tyson | 39 | Head | Ledger Clerk | Mississippi |
| 40 | Thelma Tyson | 34 | Wife | — | Brighton |
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)