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Mary Lang — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Mary Lang across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1921), then head of a 11-person household.
Age 19
b. ~1921
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Lang |
| Given Name | Mary F. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Highest Grade | H 4 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City |
| Est. Birth Year | ~1921 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| John Lang | Son | — | 3 | ~1937 |
| Helen Lang | Daughter | — | 20 | ~1920 |
| Catherine Lang | Daughter | — | 26 | ~1914 |
| Mary Lang | Daughter | — | 19 | ~1921 |
| Rosalie Lang | Daughter | — | 20 | ~1920 |
| Edward Lang | Head | — | 60 | ~1880 |
| Nora Reardon | Daughter | — | 34 | ~1906 |
| Julia Lang | Daughter | — | 16 | ~1924 |
| Julia Lang | Spouse | — | 56 | ~1884 |
| Edward Lang | Son | — | 25 | ~1915 |
| Catherine Reardon | Other | — | 72 | ~1868 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 8
Suffolk, Massachusetts · implied b. ~1922 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Long |
| Given Name | Mary F |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 19
Suffolk-County, Massachusetts · implied b. ~1921 — 11 household members
| Surname | Lang |
| Given Name | Mary F. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston City |
| 1935 Residence (County) | Suffolk |
| Highest Grade | H 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 Mary Lang across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Lang
Daughter · 1940 · age 19 · b. ~1921 · Massachusetts
★ You are viewing this record
Sibling
Nora Reardon
Sibling · 1940 · age 34
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Lang
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Julia Lang
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Lang
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Lang
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Lang
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rosalie Lang
Sibling · 1940 · age 20
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 — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01679-00710)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mattie Kathryn Matthews | 54 | Wife | Department Manager | Massachusetts |
| 2 | Joseph A. Murray | 49 | Head | Department Manager | Massachusetts |
| 3 | Grace A. Murray | 39 | Wife | — | Massachusetts |
| 4 | Joseph A. Jr. Murray | 10 | Son | — | Massachusetts |
| 5 | Lorraine Murray | 5 | Daughter | — | Massachusetts |
| 6 | Robert Murray | 3 | Son | — | Massachusetts |
| 7 | Edward J. Lang | 60 | Head | Restauranteur | Irish Free State |
| 8 | Julia Lang | 56 | Wife | — | Irish Free State |
| 9 | Catherine M. Lang | 26 | Daughter | Cashier | Massachusetts |
| 10 | Edward J. Jr. Lang | 25 | Son | Laborer | Massachusetts |
| 11 | Helen B. Lang | 20 | Daughter | Stenographer | Massachusetts |
| 12 | Mary F. Lang THIS PERSON | 19 | Daughter | — | Massachusetts |
| 13 | Julia E. Lang | 16 | Daughter | — | Massachusetts |
| 14 | John H. Lang | 3 | Son | — | Massachusetts |
| 15 | Rosalie A. Lang | 20 | Daughter | Filing Clerk | Massachusetts |
| 16 | Catherine Reardon | 72 | Mother | — | State |
| 17 | Nora A. Reardon | 34 | Daughter | Stenographer | Massachusetts |
| 18 | James Biness | 71 | Head | Supervisor | New York |
| 19 | Josephine Biness | 71 | Wife | — | England |
| 20 | Catherine Eldridge | 74 | Head | — | England |
| 21 | Alta Eldridge | 48 | Daughter | Bookkeeper | Massachusetts |
| 22 | Edward J. Gallagher | 41 | Head | Salesman | Massachusetts |
| 23 | Rose M. Gallagher | 42 | Sister | Jr. Clerk | Massachusetts |
| 24 | Jessie Q. Ireland | 58 | Head | Machine Operator | Scotland |
| 25 | Bernard Mccabe | 77 | Head | Laborer | State |
| 26 | Alice Mccabe | 67 | Wife | — | Massachusetts |
| 27 | Sally Mccabe | 33 | Daughter | Waitress | Massachusetts |
| 28 | Bernard J. Mccabe | 32 | Son | Mechanic Oil Burner | Massachusetts |
| 29 | Charles P. Morelli | 53 | Head | Custodian | Massachusetts |
| 30 | Adaide Morelli | 42 | Wife | Packer | Massachusetts |
| 31 | Charles P. Morelli | 15 | Son | — | Massachusetts |
| 32 | John Cotter | 29 | Head | Attendant | Massachusetts |
| 33 | Mildred Cotter | 29 | Wife | — | Rhode Island |
| 34 | John Cotter | 5 | Son | — | Rhode Island |
| 35 | Saunders | 37 | Sister in law | — | Massachusetts |
| 36 | Bernard Corson | 45 | Head | Proprietor | Massachusetts |
| 37 | Mary Leone | 16 | Lodger | — | Massachusetts |
| 38 | Barbara Mulcahy | 8 | Lodger | — | Massachusetts |
| 39 | Elise Shunk | 85 | Head | — | Germany |
| 40 | Elise Oberlander | 50 | Daughter | Seamstress | Massachusetts |
Related Census Records
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)