JM
John May — 1940 US Census Record
Model Tree available1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this John May across the 1920, 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed), with identified parents John & Kattie — first a son (b.~1917), then head of a 3-person household.
Age 23
b. ~1917
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | May |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Occupation | Steel Worker |
| Industry | Ship Yard |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1480 |
| Highest Grade | H-3 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Steel Worker |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1917 |
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 |
|---|---|---|---|---|
| George May | Head | — | 54 | ~1886 |
| John May | Son | — | 23 | ~1917 |
| Mary May | Spouse | — | 51 | ~1889 |
Census Appearances
1920
Baltimore, Maryland
Son, age 2
Baltimore, Maryland · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | May |
| Given Name | John A |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Son, age 12
Baltimore, Maryland · implied b. ~1918 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | May |
| Given Name | John C Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Maryland |
| Age at First Marriage | 12 |
| 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
Son, age 23
Baltimore-City-County, Maryland · implied b. ~1917 — 3 household members
| Surname | May |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Occupation | Steel Worker |
| Industry | Ship Yard |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1480 |
| Highest Grade | H-3 |
| 1935 Residence | Same place |
| 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 John May across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John May (~0.92 confidence) and mother Kattie May (~0.92 confidence) and father George May (~0.92 confidence) and mother Mary May (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John May
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Kattie May
b. ~1881
Source mother
● Household
· direct · ~0.92
Father
George May
b. ~1886
Source father
● Household
· direct · ~0.92
Mother
Mary May
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John May
Son · 1940 · age 23 · b. ~1917 · Maryland
★ 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 — 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-t0627-01538-00450)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William C. Glenner | 53 | Head | Tester | Maryland |
| 2 | Charles A. Glenner | 52 | Brother | Laborer | Maryland |
| 3 | Mary E. Droll | 60 | Housekeeper | Housekeeper | Maryland |
| 4 | George W. Freund | 50 | Head | Machinist | Maryland |
| 5 | Anna C. Freund | 41 | Wife | — | Maryland |
| 6 | Marie Freund | 19 | Daughter | Sorter | Maryland |
| 7 | George Jr. Freund | 17 | Son | — | Maryland |
| 8 | Lenore Freund | 15 | Daughter | — | Maryland |
| 9 | John Freund | 12 | Son | — | Maryland |
| 10 | Fred P. Kacher | 25 | Head | Salesman | Maryland |
| 11 | Anna K. Kacher | 49 | Mother | — | Maryland |
| 12 | Jacob Kacher | 23 | Brother | Manufacturer | Maryland |
| 13 | Innocent Ling | 44 | Head | Pipe Fitter | Maryland |
| 14 | Frances Ling | 43 | Wife | — | Maryland |
| 15 | Lorraine Ling | 11 | Daughter | — | Maryland |
| 16 | Elmer Ling | 9 | Son | — | Maryland |
| 17 | Rose M. Ling | 8 | Daughter | — | Maryland |
| 18 | Phillip Ling | 0 | Son | — | Maryland |
| 19 | George Laur | 32 | Head | Pipe Fitter | Maryland |
| 20 | Edna Laur | 26 | Wife | Examiner | Maryland |
| 21 | Henry Kratz | 52 | Head | Machinist | Maryland |
| 22 | Anna Kratz | 48 | Wife | — | Maryland |
| 23 | Charles Kratz | 16 | Son | — | Maryland |
| 24 | Lawrence F. Appel | 51 | Head | Realtor | Maryland |
| 25 | Katherine Appel | 48 | Wife | — | Maryland |
| 26 | Sophie Scharling | 75 | Mother in law | — | Germany |
| 27 | Gaetano Di Marcantonio | 58 | Head | Tailor | Italy |
| 28 | Genoveffa Di Marcantonio | 37 | Wife | — | Italy |
| 29 | Mary Di Marcantonio | 27 | Daughter | Teacher | Maryland |
| 30 | John Di Marcantonio | 23 | Son | Laborer | Maryland |
| 31 | Erma Di Marcantonio | 16 | Daughter | — | Maryland |
| 32 | Charles Demling | 35 | Head | Mechanic | Maryland |
| 33 | Mildred Demling | 34 | Wife | — | Maryland |
| 34 | Catherine Demling | 14 | Daughter | — | Maryland |
| 35 | Katie Demling | 58 | Mother | — | Maryland |
| 36 | Christian Neumeister | 46 | Head | Bartender | Germany |
| 37 | Anna Neumeister | 46 | Wife | Cook | Germany |
| 38 | George V. May | 54 | Head | Guard | Maryland |
| 39 | Mary E. May | 51 | Wife | — | Maryland |
| 40 | John May THIS PERSON | 23 | Son | Steel Worker | Maryland |
Pedigree Summary
John
Gen 1 · 4 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)