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Mary Mclean — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this Mary Mclean across the 1930 and 1940 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1920), then head of a 10-person household.
Age 10
b. ~1920
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | McLean |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Lowell |
| Est. Birth Year | ~1920 |
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.
10 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Mclean | Daughter | — | 10 | ~1920 |
| John Mclean | Head | — | 37 | ~1893 |
| Annie Mclean | Other | — | 66 | ~1864 |
| William Mclean | Son | — | 4 | ~1926 |
| John Mclean | Son | — | 12 | ~1918 |
| David Mclean | Son | — | 1 | ~1929 |
| Richard Mclean | Son | — | 2 | ~1928 |
| Robert Mclean | Son | — | 6 | ~1924 |
| James Mclean | Son | — | 8 | ~1922 |
| Mary Mclean | Spouse | — | 37 | ~1893 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 10
Middlesex, Massachusetts · implied b. ~1920 — 10 household members
| Surname | McLean |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 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
Daughter, age 19
Middlesex-County, Massachusetts · implied b. ~1921 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | MacLean |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lowell |
| 1935 Residence (County) | Middlesex |
| Hours Worked | 0 |
| Highest Grade | H 4 |
| 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 Mclean across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mclean
Daughter · 1930 · age 10 · b. ~1920 · Massachusetts
★ You are viewing this record
Sibling
James Mclean
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Mclean
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Mclean
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Mclean
Sibling · 1930 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mclean
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Mclean
Sibling · 1930 · age 6
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
1930 US Federal Census — Middlesex, Massachusetts
Open full size
1930 US Federal Census — Middlesex, Massachusetts
Page Contents
50 people indexed on this census page (ia:1930:15thcensuspopula917unit:0933)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Mclean | 37 | Head | Clerk | Massachusetts |
| 2 | Mary Mclean | 37 | Wife | — | Massachusetts |
| 3 | John Jr. Mclean | 12 | Son | — | Massachusetts |
| 4 | Mary Mclean THIS PERSON | 10 | Daughter | — | Massachusetts |
| 5 | James Mclean | 8 | Son | — | Massachusetts |
| 6 | Robert Mclean | 6 | Son | — | Massachusetts |
| 7 | William Mclean | 4 | Son | — | Massachusetts |
| 8 | Richard Mclean | 2 | Son | — | Massachusetts |
| 9 | David Mclean | 1 | Son | — | Massachusetts |
| 10 | Annie Mclean | 66 | Mother | — | Scotland |
| 11 | George Allen | 25 | Head | Clerk | Massachusetts |
| 12 | John Hammond | 18 | Head | Textile Worker | Massachusetts |
| 13 | George Hammond | 15 | Brother | Textile Worker | Massachusetts |
| 14 | Minnie Hammond | 48 | Mother | — | Maine |
| 15 | Alice Hammond | 13 | Sister | — | Massachusetts |
| 16 | Victor Dupont | 19 | Head | Textile Worker | New Hampshire |
| 17 | Patrick Shea | 21 | Head | Textile Worker | Massachusetts |
| 18 | John Shea | 17 | Brother | Textile Worker | Massachusetts |
| 19 | James Gannon | 20 | Head | Textile Worker | Rhode Island |
| 20 | John Gannon | 25 | Brother | Textile Worker | Rhode Island |
| 21 | Harry Reed | 21 | Head | Textile Worker | Massachusetts |
| 22 | William Reed | 18 | Brother | Textile Worker | Massachusetts |
| 23 | Arthur Larson | 19 | Head | Textile Worker | Rhode Island |
| 24 | Andrew Larson | 18 | Brother | Textile Worker | Rhode Island |
| 25 | William Gregg | 23 | Head | Textile Worker | New York |
| 26 | James Gregg | 22 | Brother | Textile Worker | New York |
| 27 | Fred Cunningham | 21 | Head | Textile Worker | Massachusetts |
| 28 | Joseph Cunningham | 23 | Brother | Textile Worker | Massachusetts |
| 29 | John Cunningham | 22 | Brother | Textile Worker | Massachusetts |
| 30 | James Cunningham | 20 | Brother | Textile Worker | Massachusetts |
| 31 | Thomas Cunningham | 18 | Brother | Textile Worker | Massachusetts |
| 32 | Mary Cunningham | 27 | Sister | Textile Worker | Massachusetts |
| 33 | Annie Cunningham | 25 | Sister | Textile Worker | Massachusetts |
| 34 | Margaret Cunningham | 19 | Sister | Textile Worker | Massachusetts |
| 35 | Catherine Cunningham | 17 | Sister | Textile Worker | Massachusetts |
| 36 | Helen Cunningham | 15 | Sister | — | Massachusetts |
| 37 | William Cunningham | 13 | Brother | — | Massachusetts |
| 38 | David Cunningham | 10 | Brother | — | Massachusetts |
| 39 | James Cunningham | 8 | Brother | — | Massachusetts |
| 40 | Thomas Cunningham | 6 | Brother | — | Massachusetts |
| 41 | John Cunningham | 4 | Brother | — | Massachusetts |
| 42 | Mary Cunningham | 2 | Sister | — | Massachusetts |
| 43 | Annie Cunningham | 1 | Sister | — | Massachusetts |
| 44 | Margaret Cunningham | 0 | Sister | — | Massachusetts |
| 45 | Catherine Cunningham | 0 | Sister | — | Massachusetts |
| 46 | Helen Cunningham | 0 | Sister | — | Massachusetts |
| 47 | William Cunningham | 0 | Brother | — | Massachusetts |
| 48 | David Cunningham | 0 | Brother | — | Massachusetts |
| 49 | James Cunningham | 0 | Brother | — | Massachusetts |
| 50 | Thomas Cunningham | 0 | Brother | — | Massachusetts |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)