MC
Mary Caldwell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Mary Caldwell across the 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1925), then head of a 9-person household.
Age 15
b. ~1925
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Caldwell |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Boston City |
| Est. Birth Year | ~1925 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Frances Caldwell | Daughter | — | 14 | ~1926 |
| Mary Caldwell | Daughter | — | 15 | ~1925 |
| James Caldwell | Head | — | 41 | ~1899 |
| Arthur Caldwell | Son | — | 5 | ~1935 |
| James Caldwell | Son | — | 12 | ~1928 |
| Michael Caldwell | Son | — | 8 | ~1932 |
| Christopher Caldwell | Son | — | 4 | ~1936 |
| Edward Caldwell | Son | — | 11 | ~1929 |
| Margaret Caldwell | Spouse | — | 36 | ~1904 |
Census Appearances
1930
Suffolk, Massachusetts
Daughter, age 5
Suffolk, Massachusetts · implied b. ~1925 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Caldwell |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | New York |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 15
Suffolk-County, Massachusetts · implied b. ~1925 — 9 household members
| Surname | Caldwell |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Boston city |
| 1935 Residence (County) | Suffolk |
| Highest Grade | Hs 2 |
| 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 Caldwell across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Caldwell
Daughter · 1940 · age 15 · b. ~1925 · Massachusetts
★ You are viewing this record
Sibling
Christopher Caldwell
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Caldwell
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Caldwell
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Caldwell
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Caldwell
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arthur Caldwell
Sibling · 1940 · age 5
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-t0627-01659-00551)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Hugh Doherty | 40 | Head | — | Ireland |
| 2 | Catherine Doherty | 42 | Wife | — | Ireland |
| 3 | Eunice Gannon | 16 | Daughter | — | Massachusetts |
| 4 | Festus Holleran | 51 | Head | Helper | Eire |
| 5 | Catherine Holleran | 32 | Wife | — | Eire |
| 6 | Mary Holleran | 13 | Daughter | — | Massachusetts |
| 7 | Anna Holleran | 7 | Daughter | — | Massachusetts |
| 8 | Margaret Holleran | 6 | Daughter | — | Massachusetts |
| 9 | William J. Doolin | 22 | Head | Laborer | Massachusetts |
| 10 | Helen Doolin | 24 | Wife | — | Massachusetts |
| 11 | William Doolin | 4 | Son | — | Massachusetts |
| 12 | Joan Doolin | 3 | Daughter | — | Massachusetts |
| 13 | Donald Doolin | 2 | Son | — | Massachusetts |
| 14 | Gerald Doolin | 1 | Son | — | Massachusetts |
| 15 | William Eldridge | 63 | Head | — | Rhode Island |
| 16 | Catherine Eldridge | 38 | Wife | Seamstress | Rhode Island |
| 17 | John J. Mahoney | 37 | Head | Checker | Massachusetts |
| 18 | Alice Mahoney | 31 | Wife | — | Massachusetts |
| 19 | Josephine Mahoney | 12 | Daughter | — | Massachusetts |
| 20 | John Mahoney | 6 | Son | — | Massachusetts |
| 21 | Charles Mahoney | 4 | Son | — | Massachusetts |
| 22 | Mary Mahoney | 3 | Daughter | — | Massachusetts |
| 23 | James D'Onofrio | 59 | Head | — | Italy |
| 24 | Edward De Marco | 35 | Head | — | Maryland |
| 25 | Virginia De Marco | 36 | Head | — | Massachusetts |
| 26 | Charlotte De Marco | 5 | Daughter | — | Massachusetts |
| 27 | Edward De Marco | 3 | Son | — | Massachusetts |
| 28 | James Caldwell | 41 | Head | Laborer | Massachusetts |
| 29 | Margaret Caldwell | 36 | Wife | — | New York |
| 30 | Mary Caldwell THIS PERSON | 15 | Daughter | — | Massachusetts |
| 31 | Frances Caldwell | 14 | Daughter | — | Massachusetts |
| 32 | James Caldwell | 12 | Son | — | Massachusetts |
| 33 | Edward Caldwell | 11 | Son | — | Massachusetts |
| 34 | Michael Caldwell | 8 | Son | — | Massachusetts |
| 35 | Arthur Caldwell | 5 | Son | — | Massachusetts |
| 36 | Christopher Caldwell | 4 | Son | — | Massachusetts |
| 37 | Joseph Dorval | 36 | Head | Auto Mechanic | New Hampshire |
| 38 | Christine Dorval | 36 | Wife | Operator | New Hampshire |
| 39 | Francesco Russo | 84 | Head | — | Italy |
| 40 | Joseph Russo | 42 | Son | New Worker | 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)