MD
Mary Day — 1940 US Census Record
Linked across censuses1940 United States Federal Census · St.-Joseph-County, Michigan
Our Model Tree links this Mary Day across the 1920, 1930 and 1940 US Censuses in St.-Joseph-County, Michigan (XGBoost, ~Confirmed) — first a spouse (b.~1899), then head of a 8-person household.
Age 41
b. ~1899
Female
Spouse
Born: Michigan
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | St.-Joseph-County, Michigan |
| Surname | Day |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Michigan |
| 1935 Residence (City) | Constantine Village |
| 1935 Residence (County) | St. Joseph |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Township / Ward | Constantine Village |
| 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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Marabeth Day | Daughter | — | 7 | ~1933 |
| Maxine Day | Daughter | — | 13 | ~1927 |
| Marjorie Day | Daughter | — | 10 | ~1930 |
| Garrett Day | Daughter | — | 5 | ~1935 |
| Margaret Day | Daughter | — | 18 | ~1922 |
| Marquis Day | Head | — | 49 | ~1891 |
| Harvey Day | Son | — | 19 | ~1921 |
| Mary Day | Spouse | — | 41 | ~1899 |
Census Appearances
1920
St Joseph, …
Spouse, age 21
St Joseph, Michigan · implied b. ~1899 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | Mary L |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Married |
| Birthplace | Michigan |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1930
St Joseph, …
Spouse, age 32
St Joseph, Michigan · implied b. ~1898 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Michigan |
| Age at First Marriage | 21 |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Indiana |
| Can Read/Write | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1940
St.-Joseph-County, Michigan
Spouse, age 41
St.-Joseph-County, Michigan · implied b. ~1899 — 8 household members
| Surname | Day |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Michigan |
| 1935 Residence (City) | Constantine Village |
| 1935 Residence (County) | St. Joseph |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
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 Mary Day across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Day
Spouse · 1940 · age 41 · b. ~1899 · Michigan
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — St.-Joseph-County, Michigan
Open full size
1940 US Federal Census — St.-Joseph-County, Michigan
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01817-00113)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Harry Ladwig | 34 | Head | Laborer | Illinois |
| 2 | Olive Ladwig | 37 | Wife | — | Michigan |
| 3 | Harriett Ladwig | 17 | Daughter | — | Michigan |
| 4 | Edgar Hegarty | 30 | Head | Laborer | Pennsylvania |
| 5 | Zella Hegarty | 22 | Wife | — | Michigan |
| 6 | Alice Hegarty | 3 | Daughter | — | Michigan |
| 7 | Barbara Hegarty | 1 | Daughter | — | Michigan |
| 8 | Cyl Thorn | 52 | Head | Manager | Indiana |
| 9 | Gladys Thorn | 48 | Wife | — | Michigan |
| 10 | Paul Thorn | 18 | Son | — | Michigan |
| 11 | John Keelhoffer | 69 | Head | Carpenter | Michigan |
| 12 | Minnie Keelhoffer | 65 | Wife | — | Michigan |
| 13 | Earl H. Keelhoffer | 48 | Son | — | Michigan |
| 14 | Ambrose Forreider | 70 | Head | Laborer | Michigan |
| 15 | Blanche Forreider | 64 | Wife | — | Michigan |
| 16 | Mabel Roys | 79 | Head | — | Michigan |
| 17 | Emma Roys | 69 | Wife | — | Michigan |
| 18 | Nellie Fish | 66 | Head | — | Indiana |
| 19 | Robert Tennison | 33 | Son | Mechanic | Michigan |
| 20 | Kathryn Tennison | 28 | Daughter-in-law | Trained Nurse | Indiana |
| 21 | James Tennison | 3 | Grandson | — | Illinois |
| 22 | Donald Traver | 58 | Head | — | Michigan |
| 23 | Lou Traver | 61 | Wife | — | Michigan |
| 24 | Clarence Chrisman | 42 | Nephew | Proprietor | Michigan |
| 25 | Dorotha Chrisman | 31 | Niece | Music Teacher | Michigan |
| 26 | June Chrisman | 8 | Niece | — | Michigan |
| 27 | Marquis Day | 49 | Head | Operator | Indiana |
| 28 | Mary Day THIS PERSON | 41 | Wife | — | Michigan |
| 29 | Harvey Day | 19 | Son | Laborer | Michigan |
| 30 | Margaret Day | 18 | Daughter | Clerical Helper | Michigan |
| 31 | Maxine Day | 13 | Daughter | — | Michigan |
| 32 | Marjorie Day | 10 | Daughter | — | Michigan |
| 33 | Marabeth Day | 7 | Daughter | — | Michigan |
| 34 | Garrett Lynn Day | 5 | Daughter | — | Michigan |
| 35 | William Jr. Ritter | 48 | Head | Proprietor | Pennsylvania |
| 36 | Grace Ritter | 44 | Wife | — | Michigan |
| 37 | Mildred Ritter | 21 | Daughter | — | Michigan |
| 38 | Margaret Ritter | 18 | Daughter | — | Michigan |
| 39 | Chauncey Stickler | 42 | Head | Lawyer | Pennsylvania |
| 40 | Marie Stickler | 38 | Wife | — | Pennsylvania |
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)