MH
Mary Harrington — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this Mary Harrington across the 1920 and 1930 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1905), then head of a 11-person household.
Age 25
b. ~1905
Female
Daughter
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Harrington |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| 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 | Cambridge City |
| Est. Birth Year | ~1905 |
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 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Harrington | Daughter | — | 25 | ~1905 |
| Mary Harrington | Daughter | — | 16 | ~1914 |
| Mary Harrington | Daughter | — | 35 | ~1895 |
| Mary Harrington | Daughter | — | 16 | ~1914 |
| John Harrington | Head | — | 59 | ~1871 |
| John Harrington | Son | — | 23 | ~1907 |
| John Harrington | Son | — | 26 | ~1904 |
| John Harrington | Son | — | 45 | ~1885 |
| John Harrington | Son | — | 23 | ~1907 |
| John Harrington | Son | — | 23 | ~1907 |
| Mary Harrington | Spouse | — | 57 | ~1873 |
Census Appearances
1920
Middlesex, Massachusetts
Daughter, age 16
Middlesex, Massachusetts · implied b. ~1904 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harrington |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| 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 25
Middlesex, Massachusetts · implied b. ~1905 — 11 household members
| Surname | Harrington |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| 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 |
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 Harrington across 2 US Census years (1920 and 1930) in Middlesex, Massachusetts, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Harrington
Daughter · 1930 · age 25 · b. ~1905 · Massachusetts
★ You are viewing this record
Sibling
Mary Harrington
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Harrington
Sibling · 1930 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Harrington
Sibling · 1930 · age 35
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Harrington
Sibling · 1930 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Harrington
Sibling · 1930 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Harrington
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Harrington
Sibling · 1930 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Harrington
Sibling · 1930 · age 45
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:massachusettscensus00reel916:1140)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William J Sullivan | 55 | Head | Director | Massachusetts |
| 2 | Mary E Sullivan | 48 | Wife | — | Massachusetts |
| 3 | William J Jr Sullivan | 25 | Son | Accountant | Massachusetts |
| 4 | Mary E Sullivan | 17 | Daughter | — | Massachusetts |
| 5 | Alice M Sullivan | 15 | Daughter | — | Massachusetts |
| 6 | Eleanor M Sullivan | 14 | Daughter | — | Massachusetts |
| 7 | Eileen Sullivan | 12 | Daughter | — | Massachusetts |
| 8 | Margaret Sullivan | 32 | Servant | Maid | Irish Free State |
| 9 | George Sargent | 52 | Head | Manager | Massachusetts |
| 10 | Edith Sargent | 55 | Wife | — | Massachusetts |
| 11 | George Sargent | 15 | Son | — | Massachusetts |
| 12 | Edith Sargent | 29 | Daughter | — | Massachusetts |
| 13 | George Sargent | 14 | Son | — | Massachusetts |
| 14 | Edith Sargent | 12 | Daughter | — | Massachusetts |
| 15 | William Park | 42 | Head | Manager | Massachusetts |
| 16 | Mary Park | 40 | Wife | — | Massachusetts |
| 17 | William Park | 12 | Son | — | Massachusetts |
| 18 | Mary Park | 9 | Daughter | — | Massachusetts |
| 19 | John Lundberg | 43 | Head | — | Rhode Island |
| 20 | Hilda Lundberg | 45 | Sister | — | Rhode Island |
| 21 | Anna Lundberg | 42 | Sister | — | Rhode Island |
| 22 | John Lundberg | 45 | Head | Gardener | Irish Free State |
| 23 | Mary Lundberg | 43 | Wife | — | Irish Free State |
| 24 | John Lundberg | 19 | Son | Clerk | Massachusetts |
| 25 | Mary Lundberg | 17 | Daughter | — | Massachusetts |
| 26 | John Harrington | 56 | Head | Foreman | Massachusetts |
| 27 | Mary Harrington | 54 | Wife | — | Massachusetts |
| 28 | Harold Read | 48 | Head | Painter | Massachusetts |
| 29 | Mary Read | 42 | Wife | — | Massachusetts |
| 30 | Harold Read | 22 | Son | — | Massachusetts |
| 31 | Mary Read | 20 | Daughter | — | Massachusetts |
| 32 | Harold Read | 19 | Son | — | Massachusetts |
| 33 | Mary Read | 16 | Daughter | — | Massachusetts |
| 34 | Harold Read | 13 | Son | — | Massachusetts |
| 35 | Mary Read | 22 | Daughter | — | Massachusetts |
| 36 | Harold Read | 10 | Son | — | Massachusetts |
| 37 | Mary Read | 16 | Daughter | — | Massachusetts |
| 38 | Harold Read | 23 | Son | Maid | Irish Free State |
| 39 | Mary Read | 16 | Daughter | — | Irish Free State |
| 40 | John Harrington | 59 | Head | Superintendent | Massachusetts |
| 41 | Mary Harrington | 57 | Wife | — | Massachusetts |
| 42 | John Harrington | 26 | Son | Salesman | Massachusetts |
| 43 | Mary Harrington THIS PERSON | 25 | Daughter | — | Massachusetts |
| 44 | John Harrington | 45 | Son | — | Massachusetts |
| 45 | Mary Harrington | 35 | Daughter | — | Massachusetts |
| 46 | John Harrington | 23 | Son | Maid | Irish Free State |
| 47 | Mary Harrington | 16 | Daughter | — | Irish Free State |
| 48 | John Harrington | 23 | Son | Maid | Irish Free State |
| 49 | Mary Harrington | 16 | Daughter | — | Irish Free State |
| 50 | John Harrington | 23 | Son | Maid | Irish Free State |
Related Census Records
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)