JH
John Harrington — 1930 US Census Record
Model Tree available1930 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this John Harrington across the 1920, 1930 and 1940 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed), with identified parents Mary — first a head (b.~1899), then head of a 5-person household.
Age 31
b. ~1899
Male
Head
Born: Massachusetts
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| Surname | Harrington |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Age at First Marriage | 22 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Machinist |
| Industry | Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 25.00 |
| Radio Set | R |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Machinist |
| Township / Ward | Cambridge City |
| Est. Birth Year | ~1899 |
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.
5 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Dorothy Harrington | Daughter | — | ~1930 | |
| Margaret Harrington | Daughter | — | 5 | ~1925 |
| John Harrington | Head | — | 31 | ~1899 |
| Margaret Harrington | Other | — | 30 | ~1900 |
| John Harrington | Son | — | 8 | ~1922 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 20
Middlesex, Massachusetts · implied b. ~1900 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harrington |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Head, age 31
Middlesex, Massachusetts · implied b. ~1899 — 5 household members
| Surname | Harrington |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Age at First Marriage | 22 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Machinist |
| Industry | Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 25.00 |
| Radio Set | R |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Other, age 42
Middlesex-County, Massachusetts · implied b. ~1898 — 40 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harrington |
| Given Name | John |
| Relationship to Head | Inmate |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | United States |
| 1935 Residence (County) | Middlesex |
| Industry | Inmate |
| Highest Grade | No 8 |
| 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 John Harrington across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Mary Harrington (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Mary Harrington
b. ~1876
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Harrington
Head · 1930 · age 31 · b. ~1899 · Massachusetts
★ You are viewing this record
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:massachusettscensus00reel915:0233)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Anthony Pacheco | 20 | Son | Laborer | Portugal |
| 2 | Jude Pacheco | 18 | Son | Finisher | Portugal |
| 3 | John Pacheco | 12 | Son | — | Massachusetts |
| 4 | Angelina Pacheco | 11 | Daughter | — | Massachusetts |
| 5 | Helen Pacheco | 7 | Daughter | — | Massachusetts |
| 6 | Fred Weseluk | 39 | Head | Helper | Russia |
| 7 | Blanche Weseluk | 25 | Wife-H | — | Lithuania |
| 8 | Victor Weseluk | 52 | Uncle | Machine-Maker | Lithuania |
| 9 | Annie Mcdonough | 57 | Head | Matron | Newfoundland |
| 10 | Arthur Mcdonough | 23 | Son | Radio-Maker | Massachusetts |
| 11 | John T Pero | 36 | Head | Mill-Man | Massachusetts |
| 12 | Julia A Pero | 34 | Wife-H | — | Massachusetts |
| 13 | Thomas W Pero | 12 | Son | — | Massachusetts |
| 14 | Daniel J Pero | 8 | Son | — | Massachusetts |
| 15 | Walter F Pero | 5 | Son | — | Massachusetts |
| 16 | James E Pero | 3 | Son | — | Massachusetts |
| 17 | Raymond A Pero | 1 | Son | — | Massachusetts |
| 18 | John Harrington THIS PERSON | 31 | Head | Machinist | Massachusetts |
| 19 | Margaret Harrington | 30 | Wife-H | — | Massachusetts |
| 20 | John Jr Harrington | 8 | Son | — | Massachusetts |
| 21 | Margaret Harrington | 5 | Daughter | — | Massachusetts |
| 22 | Dorothy Harrington | 0 | Daughter | — | Massachusetts |
| 23 | Dennis F Sheehan | 42 | Head | — | Massachusetts |
| 24 | Mary E Sheehan | 41 | Wife-H | — | Massachusetts |
| 25 | Francis Sheehan | 15 | Son | — | Massachusetts |
| 26 | Edna Sheehan | 13 | Daughter | — | Massachusetts |
| 27 | Joseph Sheehan | 11 | Son | — | Massachusetts |
| 28 | Mary Sheehan | 8 | Daughter | — | Massachusetts |
| 29 | Helen Sheehan | 6 | Daughter | — | Massachusetts |
| 30 | Vincent Sheehan | 4 | Son | — | Massachusetts |
| 31 | James Sheehan | 3 | Son | — | Massachusetts |
| 32 | Joe Luiz | 49 | Head | Repair-Man | Portugal |
| 33 | Mary Luiz | 45 | Wife-H | — | Portugal |
| 34 | John P Barboza | 39 | Head | Mechanic | Portugal |
| 35 | Mary Barboza | 30 | Wife-H | Machine-Worker | Massachusetts |
| 36 | Fernanda Barboza | 9 | Daughter | — | Massachusetts |
| 37 | Mary Pontes | 52 | Mo-in-law | — | Portugal |
| 38 | Manuel Pereira | 27 | Head | Laborer | Portugal |
| 39 | Rose Pereira | 22 | Wife-H | — | Vermont |
| 40 | Dorothy Pereira | 1 | Daughter | — | Massachusetts |
| 41 | Anthony Pereira | 20 | Brother | Laborer | Portugal |
| 42 | Cornelius Bradley | 30 | Head | Truck-Driver | Massachusetts |
| 43 | Catherine Bradley | 28 | Wife-H | — | Massachusetts |
| 44 | Leonard Bradley | 1 | Son | — | Massachusetts |
| 45 | Catherine Bradley | 0 | Daughter | — | Massachusetts |
| 46 | Martin Rounds | 60 | Head | Foreman | Ireland |
| 47 | Edward Rounds | 14 | Son | — | Massachusetts |
| 48 | Gertrude Rounds | 14 | Daughter | — | Massachusetts |
| 49 | Dorothy Rounds | 18 | Daughter | — | Massachusetts |
| 50 | Martin Rounds | 20 | Son | Box-Maker | Massachusetts |
Pedigree Summary
John
Gen 1 · 1 parents
~0.92
Max depth 4 (1900–1950 window)
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)