JF
John Farrell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Farrell across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 9-person household.
Age 15
b. ~1925
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Farrell |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lowell City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Lowell City |
| Est. Birth Year | ~1925 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Jean Farrell | Daughter | — | 9 | ~1931 |
| Constance Farrell | Daughter | — | 12 | ~1928 |
| Therese Farrell | Daughter | — | 13 | ~1927 |
| Helen Farrell | Daughter | — | 17 | ~1923 |
| Richard Farrell | Head | — | 46 | ~1894 |
| Richard Farrell | Son | — | 10 | ~1930 |
| John Farrell | Son | — | 15 | ~1925 |
| William Farrell | Son | — | 8 | ~1932 |
| Mary Farrell | Spouse | — | 39 | ~1901 |
Census Appearances
1930
Middlesex, Massachusetts
Son, age 5
Middlesex, Massachusetts · implied b. ~1925 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Farrell |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 15
Middlesex-County, Massachusetts · implied b. ~1925 — 9 household members
| Surname | Farrell |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lowell City |
| 1935 Residence (County) | Middlesex |
| Highest Grade | Hs 2 |
| 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 Farrell across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Farrell
Son · 1940 · age 15 · b. ~1925 · Massachusetts
★ You are viewing this record
Sibling
Helen Farrell
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Therese Farrell
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jean Farrell
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Farrell
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Constance Farrell
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Farrell
Sibling · 1940 · age 8
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-t0627-01691-00396)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Daniel Healey | 68 | Head | Retired | Eire |
| 2 | Elizabeth Healey | 70 | Wife | Retired | England |
| 3 | Charles Leblanc | 57 | Head | Retired | Canada French |
| 4 | Anna Piche | 33 | Niece | Laborer | Massachusetts |
| 5 | Mary Stapleton | 47 | Head | Making Wagons | Massachusetts |
| 6 | Agnes Stapleton | 42 | Sister | — | Massachusetts |
| 7 | Timothy Stapleton | 36 | Brother | Chauffeur | Massachusetts |
| 8 | Thomas Brennan | 65 | Head | Coal Passer | Eire |
| 9 | Delia Brennan | 65 | Wife | — | Eire |
| 10 | John Brennan | 29 | Son | Stock Clerk | Massachusetts |
| 11 | Thomas F. Brennan | 40 | Son | W.P.A. | Massachusetts |
| 12 | Pearl Brennan | 17 | Granddaughter | — | Massachusetts |
| 13 | Priscilla Brennan | 10 | Granddaughter | — | Massachusetts |
| 14 | John F. Hanigan | 73 | Head | — | Eire |
| 15 | Mary Hanigan | 73 | Wife | — | Maine |
| 16 | Harvey Beland | 28 | Head | W.P.A. | Massachusetts |
| 17 | Jeanne Beland | 27 | Wife | — | Canada French |
| 18 | Paul Beland | 4 | Son | — | Massachusetts |
| 19 | Fernande Beland | 2 | Son | — | Massachusetts |
| 20 | Joseph M. Mcmahon | 40 | Head | Chauffeur | Massachusetts |
| 21 | Catherine F. Mcmahon | 37 | Wife | Saleslady | Massachusetts |
| 22 | John J. Mcmahon | 10 | Son | — | Massachusetts |
| 23 | Wendell F. Mcmahon | 8 | Son | — | Massachusetts |
| 24 | Marilyn Mcmahon | 6 | Daughter | — | Massachusetts |
| 25 | Richard J. Farrell | 46 | Head | Police Officer | Massachusetts |
| 26 | Mary Farrell | 39 | Wife | — | Massachusetts |
| 27 | Helen Farrell | 17 | Daughter | — | Massachusetts |
| 28 | John Farrell THIS PERSON | 15 | Son | — | Massachusetts |
| 29 | Therese Farrell | 13 | Daughter | — | Massachusetts |
| 30 | Constance Farrell | 12 | Daughter | — | Massachusetts |
| 31 | Richard Jr. Farrell | 10 | Son | — | Massachusetts |
| 32 | Jean Farrell | 9 | Daughter | — | Massachusetts |
| 33 | William Farrell | 8 | Son | — | Massachusetts |
| 34 | Arthur Bouthillette | 31 | Head | Shoe Worker | Massachusetts |
| 35 | Victoria Bouthillette | 32 | Wife | Skiver | Maine |
| 36 | John F. Meehan | 39 | Head | Printer | Massachusetts |
| 37 | Mary Meehan | 35 | Wife | — | Massachusetts |
| 38 | Mary Meehan | 9 | Daughter | — | Massachusetts |
| 39 | Robert Meehan | 8 | Son | — | Massachusetts |
| 40 | Arlene Meehan | 6 | Daughter | — | Massachusetts |
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)