JD
John Day — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Day across the 1910, 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Charlotte & Joseph — first a head (b.~1905), then head of a 3-person household.
Age 35
b. ~1905
Male
Head
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Day |
| Given Name | John L. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Roslindale |
| Additional Details | |
| Occupation | Civil Engineer |
| Industry | Dept. Pub. Works |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 16 |
| Highest Grade | No C 3 |
| 1935 Residence | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Civil Engineer |
| Township / Ward | Natick |
| 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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Day | Head | — | 35 | ~1905 |
| John Day | Son | — | 3 | ~1937 |
| Mary Day | Spouse | — | 34 | ~1906 |
Census Appearances
1910
Suffolk, Massachusetts
Son, age 6
Suffolk, Massachusetts · implied b. ~1904 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | Joseph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Eng-English |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1920
Suffolk, Massachusetts
Son, age 15
Suffolk, Massachusetts · implied b. ~1905 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | John L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Canada |
| Mother's Birthplace | Massachusetts |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Son, age 25
Suffolk, Massachusetts · implied b. ~1905 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | John L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | England Canada |
| Mother's Birthplace | Massachusetts |
| Occupation | Engineer |
| Industry | Steamship Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Head, age 35
Middlesex-County, Massachusetts · implied b. ~1905 — 3 household members
| Surname | Day |
| Given Name | John L. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Roslindale |
| Occupation | Civil Engineer |
| Industry | Dept. Pub. Works |
| Class of Worker | GW |
| Hours Worked | 48 |
| Income (1939) | 16 |
| Highest Grade | No C 3 |
| 1935 Residence | Massachusetts |
| 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 Day across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Charlotte Day (~0.92 confidence) and father Joseph Day (~0.92 confidence) and mother Mary Day (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Charlotte Day
b. ~1881
Source mother
● Household
· direct · ~0.92
Father
Joseph Day
b. ~1881
Source father
● Household
· direct · ~0.92
Mother
Mary Day
b. ~1881
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Day
Head · 1940 · age 35 · b. ~1905 · Massachusetts
★ You are viewing this record
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-t0627-01613-00989)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert T. Knowlton | 18 | Son | Delivery Boy | Massachusetts |
| 2 | Goldwin L. Holbrook | 41 | Head | Accountant | Massachusetts |
| 3 | Phyllis W. Holbrook | 34 | Wife | — | New Hampshire |
| 4 | Harold H. Johnson | 56 | Head | Office Manager | Rhode Island |
| 5 | Martha L. Johnson | None | Wife | — | LINE |
| 6 | Doris L. Johnson | 23 | Daughter | — | Massachusetts |
| 7 | Elizabeth S. Johnson | 21 | Daughter | Clerk | Massachusetts |
| 8 | Robert L. Johnson | 20 | Son | — | Massachusetts |
| 9 | Roger A. Johnson | 16 | Son | — | Massachusetts |
| 10 | Arthur L. Johnson | 6 | Son | — | Massachusetts |
| 11 | Rebecca Hodgson | 81 | Mother in law | — | Massachusetts |
| 12 | George L. Jr. Borden | 47 | Head | Foreman | Massachusetts |
| 13 | Mary H. Borden | 46 | Wife | — | Massachusetts |
| 14 | William Borden | 17 | Son | Laborer | Massachusetts |
| 15 | Helen G. Borden | 13 | Daughter | — | Massachusetts |
| 16 | Richard Borden | 5 | Son | — | Massachusetts |
| 17 | Jean Donovan | 24 | Daughter | Nurse | Massachusetts |
| 18 | William Donovan | 4 | Grandson | — | Massachusetts |
| 19 | James R. Bell | 44 | Head | Garage Owner | Massachusetts |
| 20 | Frances Bell | 47 | Wife | — | Massachusetts |
| 21 | James R. Jr. Bell | 21 | Son | — | Massachusetts |
| 22 | Thelma L. Bell | 18 | Daughter | — | Massachusetts |
| 23 | Mary L. Bates | 56 | Head | — | Massachusetts |
| 24 | John L. Day THIS PERSON | 35 | Head | Civil Engineer | Massachusetts |
| 25 | Mary L. Day | 34 | Wife | — | Massachusetts |
| 26 | John L. Jr. Day | 3 | Son | — | Massachusetts |
| 27 | William R. Neale | 57 | Head | Mechanic | Massachusetts |
| 28 | Margaret E. Neale | 46 | Wife | — | Massachusetts |
| 29 | Cynthia Neale | 16 | Daughter | — | Massachusetts |
| 30 | Raymond L. Reed | 62 | Bro in law | — | Vermont |
| 31 | Beatrice A. Reed | 57 | Sister in law | — | Vermont |
| 32 | Eleanor W. Partridge | 62 | Head | Teacher | New Hampshire |
| 33 | Elizabeth H. Partridge | 30 | Daughter | Librarian | Massachusetts |
| 34 | Barbara S. Partridge | 28 | Daughter | Librarian | Massachusetts |
| 35 | Ida Lundholm | 73 | Head | — | Sweden |
| 36 | Helen Lundholm | 32 | Daughter | Storekeeper | Massachusetts |
| 37 | Earl R. Winn | 42 | Head | Machinist | Massachusetts |
| 38 | Helen Winn | 41 | Wife | — | Massachusetts |
| 39 | Marjorie Winn | 19 | Daughter | — | Massachusetts |
| 40 | Mildred Winn | 18 | Daughter | — | Massachusetts |
Pedigree Summary
John
Gen 1 · 3 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)