JC
John Coffey — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Coffey across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 12-person household.
Age 17
b. ~1923
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Coffey |
| Given Name | John F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lowell |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H-2 |
| 1935 Residence | Same Place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Lowell |
| Est. Birth Year | ~1923 |
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.
12 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Lena Coffey | Daughter | — | 21 | ~1919 |
| Timothy Coffey | Head | — | 53 | ~1887 |
| Elizabeth Coffey | Daughter | — | 19 | ~1921 |
| Bertha Coffey | Spouse | — | 55 | ~1885 |
| Bertha Coffey | Daughter | — | 22 | ~1918 |
| Theodore Coffey | Son | — | 15 | ~1925 |
| Barbara Coffey | Daughter | — | 20 | ~1920 |
| William Coffey | Son | — | 26 | ~1914 |
| Esther Horan | Other | — | 19 | ~1921 |
| Catherine Horan | Other | — | 15 | ~1925 |
| Margaret Coffey | Daughter | — | 24 | ~1916 |
| John Coffey | Son | — | 17 | ~1923 |
Census Appearances
1930
Middlesex, Massachusetts
Son, age 7
Middlesex, Massachusetts · implied b. ~1923 — 18 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Coffey |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| 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 |
1940
Middlesex-County, Massachusetts
Son, age 17
Middlesex-County, Massachusetts · implied b. ~1923 — 12 household members
| Surname | Coffey |
| Given Name | John F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lowell |
| 1935 Residence (County) | Middlesex |
| Income (1939) | 0 |
| Highest Grade | H-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 Coffey across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Coffey
Son · 1940 · age 17 · b. ~1923 · Massachusetts
★ You are viewing this record
Sibling
Theodore Coffey
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Barbara Coffey
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lena Coffey
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bertha Coffey
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Coffey
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Coffey
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Coffey
Sibling · 1940 · age 19
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-t0627-01693-00453)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Claire Foley | 15 | Daughter | — | Massachusetts |
| 42 | Jacqueline Foley | 12 | Daughter | — | Massachusetts |
| 43 | Edward J. Giacchino | 36 | Head | Merchant | Massachusetts |
| 44 | Rhea Giacchino | 30 | Wife | — | Massachusetts |
| 45 | Margery Giacchino | 4 | Daughter | — | Massachusetts |
| 46 | Ellen Giacchino | 2 | Daughter | — | Massachusetts |
| 47 | Minnie Cohen | 52 | Mother-in-law | — | Russia |
| 48 | Charles F. O'Neil | 42 | Head | Sales Manager | Massachusetts |
| 49 | Ruth E. O'Neil | 38 | Wife | — | Massachusetts |
| 50 | Mary R. O'Neil | 9 | Daughter | — | Massachusetts |
| 51 | Thomas R. O'Neil | 7 | Son | — | Massachusetts |
| 52 | Charles J. O'Neil | 5 | Son | — | Massachusetts |
| 53 | Ann E. O'Neil | 4 | Daughter | — | Massachusetts |
| 54 | B. Randolph Cady | 35 | Head | Salesman | Massachusetts |
| 55 | Virginia Cady | 34 | Wife | — | Massachusetts |
| 56 | B. Randolph Jr. Cady | 10 | Son | — | Massachusetts |
| 57 | Priscilla Cady | 8 | Daughter | — | Massachusetts |
| 58 | Mary Poirier | 23 | Servant | Maid | Maine |
| 59 | Isabelle Lowery | 38 | Head | — | Canada-English |
| 60 | Timothy J. Coffey | 53 | Head | Sales Manager | Massachusetts |
| 61 | Bertha B. Coffey | 55 | Wife | — | Massachusetts |
| 62 | William T. Coffey | 26 | Son | Chemist | Massachusetts |
| 63 | Margaret E. Coffey | 24 | Daughter | Stenographer | Massachusetts |
| 64 | Bertha B. Coffey | 22 | Daughter | Student Nurse | Massachusetts |
| 65 | Lena V. Coffey | 21 | Daughter | — | Maine |
| 66 | Barbara L. Coffey | 20 | Daughter | — | Massachusetts |
| 67 | Elizabeth F. Coffey | 19 | Daughter | — | Massachusetts |
| 68 | John F. Coffey THIS PERSON | 17 | Son | — | Massachusetts |
| 69 | Theodore J. Coffey | 15 | Son | — | Massachusetts |
| 70 | Esther Horan | 19 | Niece | — | Massachusetts |
| 71 | Catherine Horan | 15 | Niece | — | Massachusetts |
| 72 | Peter Monahan | 59 | Head | Mailman | Massachusetts |
| 73 | John Monahan | 24 | Son | Attendant | Massachusetts |
| 74 | Mary Monahan | 22 | Daughter | School Teacher | Massachusetts |
| 75 | George Levine | 32 | Head | Automotive Parts | Massachusetts |
| 76 | Minnie Levine | 28 | Wife | — | Massachusetts |
| 77 | Paul Levine | 1 | Son | — | Massachusetts |
| 78 | Robert L. Roy | 45 | Head | Funeral Director | New Jersey |
| 79 | Marie M. Roy | 41 | Wife | — | New Jersey |
| 80 | Robert L. Jr. Roy | 16 | Son | — | New Jersey |
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)