MH
Mary Harrington — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Harrington across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Michael & Edward — first a daughter (b.~1905), then head of a 10-person household.
Age 35
b. ~1905
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Harrington |
| Given Name | Mary A |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Packer |
| Industry | Wholesale Cracker Co. |
| Class of Worker | PW |
| Hours Worked | 16 |
| Income (1939) | 496 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Packer |
| Township / Ward | Somerville 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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Rose Harrington | Daughter | — | 28 | ~1912 |
| Rita Harrington | Daughter | — | 19 | ~1921 |
| Josephine Harrington | Daughter | — | 33 | ~1907 |
| Florence Harrington | Daughter | — | 30 | ~1910 |
| Mary Harrington | Daughter | — | 35 | ~1905 |
| Elizabeth Harrington | Daughter | — | 25 | ~1915 |
| Edward Harrington | Head | — | 62 | ~1878 |
| Edward Harrington | Son | — | 24 | ~1916 |
| Timothy Harrington | Son | — | 30 | ~1910 |
| Catherine Harrington | Spouse | — | 60 | ~1880 |
Census Appearances
1920
Middlesex, Massachusetts
Daughter, age 12
Middlesex, Massachusetts · implied b. ~1908 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harrington |
| Given Name | Mary A |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| 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 22
Middlesex, Massachusetts · implied b. ~1908 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harrington |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Maine |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 35
Middlesex-County, Massachusetts · implied b. ~1905 — 10 household members
| Surname | Harrington |
| Given Name | Mary A |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Occupation | Packer |
| Industry | Wholesale Cracker Co. |
| Class of Worker | PW |
| Hours Worked | 16 |
| Income (1939) | 496 |
| Highest Grade | No 7 |
| 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 Harrington across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Michael Harrington (~0.92 confidence) and father Edward Harrington (~0.92 confidence) and mother Catherine Harrington (~0.92 confidence) and father Charles Harrington (~0.92 confidence) and mother Elizabeth Harrington (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Michael Harrington
b. ~1865
Source father
● Household
· direct · ~0.92
Father
Edward Harrington
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Catherine Harrington
b. ~1880
Source mother
● Household
· direct · ~0.92
Father
Charles Harrington
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Elizabeth Harrington
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Harrington
Daughter · 1940 · age 35 · b. ~1905 · Massachusetts
★ You are viewing this record
Sibling
Elizabeth Harrington
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Harrington
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Josephine Harrington
Sibling · 1940 · age 33
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rita Harrington
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Florence Harrington
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Timothy Harrington
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rose Harrington
Sibling · 1940 · age 28
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 — 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-t0627-01702-00645)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Andrew Mulligan | 24 | Son | Splicer'S Helper | Massachusetts |
| 42 | Hugh T Mulligan | 22 | Son | Clerk | Massachusetts |
| 43 | James Mulligan | 18 | Son | Assistant Manager | Massachusetts |
| 44 | Ellen Furlong | 63 | Head | — | Massachusetts |
| 45 | Mary Riley | 74 | Head | — | Ireland |
| 46 | Louise Riley | 40 | Daughter | Private Stenographer | Massachusetts |
| 47 | John F Barney | 41 | Head | Chief Clerk | Massachusetts |
| 48 | Catherine Barney | 41 | Wife | — | Massachusetts |
| 49 | Claire Barney | 10 | Daughter | — | Massachusetts |
| 50 | Virginia Barney | 9 | Daughter | — | Massachusetts |
| 51 | William Flynn | 85 | Father-in-law | — | Ireland |
| 52 | William F Flynn | 36 | Brother-in-law | Painter | Massachusetts |
| 53 | Edward Harrington | 62 | Head | — | Ireland |
| 54 | Catherine Harrington | 60 | Wife | — | Ireland |
| 55 | Mary A Harrington THIS PERSON | 35 | Daughter | Packer | Massachusetts |
| 56 | Josephine Harrington | 33 | Daughter | Packer | Massachusetts |
| 57 | Timothy M Harrington | 30 | Son | Fireman | Massachusetts |
| 58 | Florence Harrington | 30 | Daughter | Stitcher | Massachusetts |
| 59 | Rose Harrington | 28 | Daughter | Stitcher | Massachusetts |
| 60 | Elizabeth Harrington | 25 | Daughter | File Clerk | Massachusetts |
| 61 | Edward J Harrington | 24 | Son | — | Massachusetts |
| 62 | Rita L Harrington | 19 | Daughter | — | Massachusetts |
| 63 | William Rowan | 65 | Head | — | Massachusetts |
| 64 | Manuel Barreira | 33 | Head | Baker | Massachusetts |
| 65 | Doreen Barreira | 30 | Wife | — | Canada-English |
| 66 | Helen Barreira | 10 | Daughter | — | Massachusetts |
| 67 | Mary C Wischmann | 55 | Head | — | Massachusetts |
| 68 | Annie Wischmann | 26 | Neice | School Teacher | Massachusetts |
| 69 | Timothy Foley | 68 | Head | — | Ireland |
| 70 | Ellen Foley | 32 | Daughter | Typist | Massachusetts |
| 71 | James B Bradley | 79 | Head | — | Ireland |
| 72 | Mary A Bradley | 33 | Daughter | Cashier | Massachusetts |
| 73 | Anne M Rowan | 53 | Head | — | Ireland |
| 74 | Louise F Rowan | 21 | Daughter | Tabulating Clerk | Massachusetts |
| 75 | John H Rowan | 19 | Son | Checker | Massachusetts |
| 76 | Mary L Rowan | 17 | Daughter | — | Massachusetts |
| 77 | Anna M Rowan | 16 | Daughter | — | Massachusetts |
| 78 | Irene T Rowan | 14 | Daughter | — | Massachusetts |
| 79 | Eleanor C Rowan | 12 | Daughter | — | Massachusetts |
| 80 | Michael F King | 61 | Head | Custodian | Massachusetts |
Pedigree Summary
Mary + 7 siblings
Gen 1 · 5 parents
~0.92
Max depth 4 (1900–1950 window)
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)