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 1910, 1920 and 1930 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed), with identified parents Julia & John — first a son (b.~1910), then head of a 5-person household.
Age 20
b. ~1910
Male
Son
Born: Massachusetts
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Middlesex, Massachusetts |
| 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 |
| Additional Details | |
| Occupation | Clerk |
| Industry | Provision Store |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Clerk |
| Township / Ward | Town Of Arlington Part |
| Est. Birth Year | ~1910 |
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 |
|---|---|---|---|---|
| John Harrington | Head | — | 52 | ~1878 |
| Catherine Harrington | Other | — | 48 | ~1882 |
| Edward Harrington | Son | — | 16 | ~1914 |
| John Harrington | Son | — | 20 | ~1910 |
| Gerald Harrington | Son | — | 13 | ~1917 |
Census Appearances
1910
Middlesex, Massachusetts
Son, age
Middlesex, Massachusetts · implied b. ~1910 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harrington |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1920
Middlesex, Massachusetts
Son, age 9
Middlesex, Massachusetts · implied b. ~1911 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Harrington |
| Given Name | John M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 20
Middlesex, Massachusetts · implied b. ~1910 — 5 household members
| 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 | Clerk |
| Industry | Provision Store |
| Class of Worker | W |
| 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 John Harrington across 3 US Census years (1910, 1920 and 1930) in Middlesex, Massachusetts, using XGBoost record linkage. Identified parents: mother Julia Harrington (~0.82 confidence) and father John Harrington (~0.92 confidence) and mother Katherine Harrington (~0.92 confidence) and father Michael Harrington (~0.92 confidence) and mother Bridget Harrington (~0.92 confidence). The pedigree spans 2 generations with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.9
Mother
Julia Harrington
b. ~1842
Source father>mother
● Household
· direct · ~0.82
Father
John Harrington
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Katherine Harrington
b. ~1880
Source mother
● Household
· direct · ~0.92
Father
Michael Harrington
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Bridget Harrington
b. ~1888
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Harrington
Son · 1930 · age 20 · b. ~1910 · Massachusetts
★ You are viewing this record
Sibling
Edward Harrington
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gerald Harrington
Sibling · 1930 · age 13
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:massachusettscensus00reel913:0852)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Frank H. Connolly | 45 | Uncle | Foreman | Massachusetts |
| 52 | James J. Callan | 52 | Head | Letter Carrier | Massachusetts |
| 53 | Catherine Callan | 41 | Wife-H | — | Rhode Island |
| 54 | John Harrington | 52 | Head | Chauffeur | Ireland |
| 55 | Catherine Harrington | 48 | Wife-H | — | Ireland |
| 56 | John Harrington THIS PERSON | 20 | Son | Clerk | Massachusetts |
| 57 | Edward Harrington | 16 | Son | — | Massachusetts |
| 58 | Gerald Harrington | 13 | Son | — | Massachusetts |
| 59 | William E. Comeau | 33 | Head | Clerk | Canada-French |
| 60 | Gladys Comeau | 33 | Wife-H | Yes | Canada-French |
| 61 | Justin Comeau | 5 | Son | — | Massachusetts |
| 62 | Lucille Comeau | 4 | Daughter | — | Massachusetts |
| 63 | George Jackson | 27 | Head | Shipper | Massachusetts |
| 64 | Mary Jackson | 65 | Mother | Yes | England |
| 65 | Arthur Libby | 43 | Brother-in-law | Painter | Maine |
| 66 | Nellie R. Libby | 40 | Sister | — | England |
| 67 | George A. Ross | 73 | Head | Clerk | Canada-English |
| 68 | Margaret J. Ross | 76 | Wife-H | — | Massachusetts |
| 69 | Thomas F. Sullivan | 30 | Head | Officer | Massachusetts |
| 70 | Edna M. Sullivan | 27 | Wife-H | — | Massachusetts |
| 71 | Arthur E. Cornwell | 34 | Boarder | Bookkeeper | New York |
| 72 | William Sullivan | 63 | Head | Watchman | Irish Free State |
| 73 | Mary Sullivan | 59 | Wife-H | — | Irish Free State |
| 74 | Catherine Sullivan | 13 | Niece | Student | Irish Free State |
| 75 | James Duane | 40 | Head | Mechanic | Irish Free State |
| 76 | Stella Duane | 30 | Wife-H | — | Irish Free State |
| 77 | James F. Duane | 5 | Son | — | Massachusetts |
| 78 | Mary Duane | 3 | Daughter | — | Massachusetts |
| 79 | William Callahan | 33 | Head | Driver | Massachusetts |
| 80 | Lillian Callahan | 33 | Wife-H | — | Massachusetts |
| 81 | Lillian E. Callahan | 10 | Daughter | — | Massachusetts |
| 82 | Helen Callahan | 8 | Daughter | — | Massachusetts |
| 83 | Mildred Callahan | 4 | Daughter | — | Massachusetts |
| 84 | Frances Callahan | 1 | Daughter | — | Massachusetts |
| 85 | James Crane | 27 | Head | Fireman | Massachusetts |
| 86 | Myrtle Crane | 28 | Wife-H | — | Connecticut |
| 87 | James J. Crane | 5 | Son | — | Massachusetts |
| 88 | William Doherty | 51 | Head | Chauffeur | Northern Ireland |
| 89 | Elizabeth Doherty | 50 | Wife-H | — | Northern Ireland |
| 90 | Eliza Doherty | 20 | Daughter | Student | Massachusetts |
| 91 | Edward Callahan | 25 | Head | Bookkeeper | Massachusetts |
| 92 | Alice Callahan | 25 | Wife-H | — | Massachusetts |
| 93 | Edward J. Callahan | 1 | Son | — | Massachusetts |
| 94 | Donald Mcdonald | 55 | Head | Superintendent | Massachusetts |
| 95 | Annie Mcdonald | 55 | Wife-H | — | Irish Free State |
| 96 | Charles Mcdonald | 24 | Son | Salesman | Massachusetts |
| 97 | William Mcdonald | 18 | Son | — | Massachusetts |
| 98 | Edward Duggan | 46 | Head | Collector | Massachusetts |
| 99 | Gertrude Duggan | 43 | Wife-H | — | Massachusetts |
| 100 | Edward Duggan | 19 | Son | — | Massachusetts |
Pedigree Summary
John + 2 siblings
Gen 1 · 4 parents
~0.92
Gen 2 · 1 grandparents
~0.82
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)