MM
Mary May — 1940 US Census Record
Linked across censuses1940 United States Federal Census · St.-Joseph-County, Michigan
Our Model Tree links this Mary May across the 1920, 1930 and 1940 US Censuses in St.-Joseph-County, Michigan (XGBoost, ~Confirmed) — first a spouse (b.~1889), then head of a 4-person household.
Age 51
b. ~1889
Female
Spouse
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | St.-Joseph-County, Michigan |
| Surname | May |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Three Rivers city |
| 1935 Residence (County) | St. Joseph |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | H-2 |
| 1935 Residence | Same House |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Three Rivers City |
| Est. Birth Year | ~1889 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Ruby May | Daughter | — | 22 | ~1918 |
| Russell May | Head | — | 53 | ~1887 |
| David May | Son | — | 16 | ~1924 |
| Mary May | Spouse | — | 51 | ~1889 |
Census Appearances
1920
St Joseph, …
Spouse, age 32
St Joseph, Michigan · implied b. ~1888 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | May |
| Given Name | Mary |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Iowa |
| Father's Birthplace | Germany |
| Mother's Birthplace | France |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
St Joseph, …
Other, age 42
St Joseph, Michigan · implied b. ~1888 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | May |
| Given Name | Mary H |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 25 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Laundress |
| Industry | At Home |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
St.-Joseph-County, Michigan
Spouse, age 51
St.-Joseph-County, Michigan · implied b. ~1889 — 4 household members
| Surname | May |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Three Rivers city |
| 1935 Residence (County) | St. Joseph |
| Class of Worker | 0 |
| Highest Grade | H-2 |
| 1935 Residence | Same House |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 May across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary May
Spouse · 1940 · age 51 · b. ~1889 · Michigan
★ 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 — 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-t0627-01817-00701)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John S. Cowgill | 66 | Head | Electrical Engineer | Michigan |
| 42 | Edith M. Cowgill | 66 | Wife | — | Illinois |
| 43 | Russell D. May | 53 | Head | Mason | Pennsylvania |
| 44 | Mary May THIS PERSON | 51 | Wife | — | Iowa |
| 45 | Ruby May | 22 | Daughter | Clerk | Pennsylvania |
| 46 | David (At) May | 16 | Son | — | Michigan |
| 47 | Leo C. Handy | 38 | Head | Teacher | Illinois |
| 48 | Lill B. Handy | 38 | Wife | Owner | Michigan |
| 49 | Leo C. Handy | 9 | Son | — | Michigan |
| 50 | Barbara Handy | 4 | Daughter | — | Michigan |
| 51 | Ottmar H. Jedele | 45 | Head | Owner | Michigan |
| 52 | Marguerite Jedele | 37 | Wife | Clerk | Michigan |
| 53 | Howard N. Decker | 35 | Head | Principal | Michigan |
| 54 | Metha C. Decker | 36 | Wife | — | Michigan |
| 55 | Peter C. Decker | 8 | Son | — | Michigan |
| 56 | Pandora J. Decker | 1 | Daughter | — | Michigan |
| 57 | Marie Hanneman | 52 | Head | Seamstress | Illinois |
| 58 | Hust M. Hazen | 63 | Head | Owner | Illinois |
| 59 | Ida B. Hazen | 59 | Wife | — | Illinois |
| 60 | Leola Eicholtz | 16 | Lodger | — | Michigan |
| 61 | Charles H. Miller | 70 | Head | Attendant | Indiana |
| 62 | Martha M. Miller | 59 | Wife | — | Indiana |
| 63 | Lula B. Kuns | 23 | Head | — | Indiana |
| 64 | Allene Macdonald | 34 | Head | Teacher | Indiana |
| 65 | Evelyn Schrump | 28 | Lodger | Teacher | Indiana |
| 66 | Olin D. Arney | 59 | Head | Manager | Michigan |
| 67 | Grace Arney | 60 | Wife | Clerk | Illinois |
| 68 | William P. Taylor | 35 | Head | Owner | Illinois |
| 69 | Suzanne Taylor | 32 | Wife | Clerk | Illinois |
| 70 | Mary Sue Taylor | 3 | Daughter | — | Illinois |
| 71 | James J. Lewis | 68 | Father-in-law | Resident Manager | Pennsylvania |
| 72 | Grace K. Lewis | 62 | Mother-in-law | — | Illinois |
| 73 | Elles R. Williams | 41 | Head | Salesman | Michigan |
| 74 | Freda Williams | 43 | Wife | — | Michigan |
| 75 | David R. Williams | 8 | Son | — | Michigan |
| 76 | Lester L. Law | 41 | Head | Owner | Indiana |
| 77 | Marjorie F. Law | 42 | Wife | Clerk | Indiana |
| 78 | Phillip U. Law | 21 | Son | Mail Clerk | Michigan |
| 79 | Dale E. (At) Law | 19 | Son | — | Michigan |
| 80 | Douglas D. Law | 17 | Son | — | Michigan |
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)