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Mary May — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this Mary May across the 1920, 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed) — first a head (b.~1872), then head of a 4-person household.
Age 68
b. ~1872
Female
Head
Born: Maryland
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | May |
| Given Name | Mary E. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 68 |
| Marital Status | Widowed |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Same House |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1872 |
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 |
|---|---|---|---|---|
| Catherine May | Daughter | — | 29 | ~1911 |
| Mary May | Head | — | 68 | ~1872 |
| Thomas May | Son | — | 34 | ~1906 |
| James May | Son | — | 24 | ~1916 |
Census Appearances
1920
Baltimore, Maryland
Other, age 52
Baltimore, Maryland · implied b. ~1868 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | May |
| Given Name | Mary |
| Relationship to Head | Mother in law |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Widowed |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Other, age 58
Baltimore, Maryland · implied b. ~1872 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | May |
| Given Name | Mary K. |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 19 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Head, age 68
Baltimore-City-County, Maryland · implied b. ~1872 — 4 household members
| Surname | May |
| Given Name | Mary E. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 68 |
| Marital Status | Widowed |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Highest Grade | No 5 |
| 1935 Residence | Same House |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
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.
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This person
Anchor record
Mary May
Head · 1940 · age 68 · b. ~1872 · Maryland
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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 — Baltimore-City-County, Maryland
Open full size
1940 US Federal Census — Baltimore-City-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01534-00347)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John E. Quirk | 27 | Head | Inspector | Maryland |
| 2 | Anna M. Quirk | 34 | Wife | — | Maryland |
| 3 | William J. Quirk | 18 | Step-son | Machine Operator | Maryland |
| 4 | Walter G. Smith | 30 | Head | Paperhanger | Maryland |
| 5 | Elsie M. Smith | 25 | Wife | — | Maryland |
| 6 | Margaret E. Smith | 8 | Daughter | — | Maryland |
| 7 | Doris J. Smith | 6 | Daughter | — | Maryland |
| 8 | Walter E. Smith | 5 | Son | — | Maryland |
| 9 | Walter A. Smith | 3 | Son | — | Maryland |
| 10 | Robert T. Smith | 2 | Son | — | Maryland |
| 11 | Charles J. Smith | 32 | Brother-in-law | Paperhanger | Maryland |
| 12 | William E. Klingmeyer | 42 | Head | Stock Clerk | Maryland |
| 13 | Helen E. Klingmeyer | 44 | Wife | — | Maryland |
| 14 | Mildred V. Klingmeyer | 19 | Daughter | Shuttle Feeder | Maryland |
| 15 | William G. Klingmeyer | 17 | Son | New Worker | Maryland |
| 16 | Raymond F. Klingmeyer | 15 | Son | — | Maryland |
| 17 | Thomas W. Robertson | 63 | Head | Chimney Sweeper | Maryland |
| 18 | Karl Bohn | 44 | Head | Pipe Layer | Germany |
| 19 | Evelyn E. Bohn | 31 | Wife | — | Maryland |
| 20 | Raymond Thomas | 33 | Head | Cutting Inspector | Maryland |
| 21 | Valente C. Thomas | 28 | Wife | — | Maryland |
| 22 | Irving R. Martz | 47 | Head | Steamfitter | Maryland |
| 23 | Emma Martz | 48 | Wife | — | Maryland |
| 24 | Irving S. Martz | 14 | Son | — | Maryland |
| 25 | Donald Martz | 12 | Son | — | Maryland |
| 26 | Mary Kraus | 79 | Head | — | Germany |
| 27 | Hubert J. Seipp | 26 | Head | Step Cover Cutter | Virginia |
| 28 | Mora Seipp | 28 | Wife | — | Maryland |
| 29 | Barton A. Seipp | 1 | Daughter | — | Maryland |
| 30 | James H. Seipp | 0 | Son | — | Maryland |
| 31 | George W. Wanko | 40 | Head | Machine Operator | Pennsylvania |
| 32 | Elizabeth Wanko | 39 | Wife | — | Maryland |
| 33 | Helen M. Wanko | 11 | Daughter | — | Maryland |
| 34 | Mary E. May THIS PERSON | 68 | Head | — | Maryland |
| 35 | Thomas F. May | 34 | Son | Baker | Maryland |
| 36 | Catherine C. May | 29 | Daughter | — | Maryland |
| 37 | James W. May | 24 | Son | Blacksmith Helper | Maryland |
| 38 | Richard H. Duvall | 35 | Head | Truck Driver | West Virginia |
| 39 | Pearl Duvall | 29 | Wife | — | West Virginia |
| 40 | Richard H. Jr. Duvall | 9 | Son | — | Maryland |
Related Census Records
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)