JM
John May — 1940 US Census Record
Model Tree available1940 United States Federal Census · Alameda-County, California
Our Model Tree links this John May across the 1920, 1930 and 1940 US Censuses in Alameda-County, California (XGBoost, ~Confirmed), with identified parents Henry & Henry — first a son (b.~1910), then head of a 5-person household.
Age 30
b. ~1910
Male
Son
Born: Colorado
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Alameda-County, California |
| Surname | May |
| Given Name | John S. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | Berkeley City |
| 1935 Residence (County) | Alameda |
| Additional Details | |
| Occupation | salesman |
| Industry | Dairy Prod. |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 2500 |
| Highest Grade | C 4 |
| 1935 Residence | Same place |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Occupation | Salesman |
| Township / Ward | Berkeley City |
| Est. Birth Year | ~1910 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Elizabeth May | Daughter | — | 32 | ~1908 |
| M May | Head | — | 54 | ~1886 |
| Mary Thompson | Other | — | 60 | ~1880 |
| Henry May | Son | — | 25 | ~1915 |
| John May | Son | — | 30 | ~1910 |
Census Appearances
1920
Alameda, California
Son, age 11
Alameda, California · implied b. ~1909 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | May |
| Given Name | John R. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Colorado |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1930
Alameda, California
Son, age 20
Alameda, California · implied b. ~1910 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | May |
| Given Name | John R. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Colorado |
| Can Read/Write | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
Alameda-County, California
Son, age 30
Alameda-County, California · implied b. ~1910 — 5 household members
| Surname | May |
| Given Name | John S. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | Berkeley City |
| 1935 Residence (County) | Alameda |
| Occupation | salesman |
| Industry | Dairy Prod. |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 2500 |
| Highest Grade | C 4 |
| 1935 Residence | Same place |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
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 Henry May (~0.92 confidence) and father Henry May (~0.92 confidence) and mother Reba May (~0.92 confidence) and father M May (~0.92 confidence) and mother May May (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Henry May
b. ~1860
Source father
● Household
· direct · ~0.92
Father
Henry May
b. ~1863
Source father
● Household
· direct · ~0.92
Mother
Reba May
b. ~1866
Source mother
● Household
· direct · ~0.92
Father
M May
b. ~1886
Source father
● Household
· direct · ~0.92
Mother
May May
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John May
Son · 1940 · age 30 · b. ~1910 · California
★ You are viewing this record
Sibling
Henry May
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth May
Sibling · 1940 · age 32
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Alameda-County, California
Open full size
1940 US Federal Census — Alameda-County, California
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-00188-00395)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Paisley Kennedy | 9 | daughter | — | Penn |
| 42 | Carl Kennedy | 46 | Head | Surgeon | California |
| 43 | Elvia B. Kennedy | 41 | wife | — | Illinois |
| 44 | Carlton Kennedy | 17 | son | — | California |
| 45 | Roderick Kennedy | 15 | son | — | California |
| 46 | Marylin Kennedy | 13 | daughter | — | California |
| 47 | Kathryn Kennedy | 11 | daughter | — | California |
| 48 | Agatha Decker | 53 | servant | Maid | Denmark |
| 49 | Winslow Mcconn | 68 | Head | Inspector | Mass |
| 50 | Margaret Mcconn | 62 | wife | — | Canada |
| 53 | Mrs. H. E. Pennell | 61 | Head | — | California |
| 54 | Elizabeth Pennell | 29 | daughter | Secretary | Oregon |
| 55 | Mrs. George Beach | 62 | Sister | — | California |
| 56 | George G. Raitt | 48 | Head | Engineer | Canada |
| 57 | Anna Mary Raitt | 44 | wife | — | Canada |
| 58 | James Raitt | 20 | son | — | Canada |
| 59 | Frances Raitt | 18 | daughter | — | Canada |
| 60 | Louise P. Cantelow | 40 | Head | — | Texas |
| 61 | Herbert Cantelow | 16 | son | — | Berkeley |
| 62 | Jean Cantelow | 13 | daughter | — | California |
| 63 | M. Richard May | 54 | Head | — | Colorado |
| 64 | John S. May THIS PERSON | 30 | son | Salesman | Colorado |
| 65 | Elizabeth May | 32 | daughter | Teacher | Colorado |
| 66 | Mary Thompson | 60 | servant | Cook | Kansas |
| 67 | Henry F. May | 25 | son | — | Colorado |
| 68 | Syd S. Smith | 44 | head | Physician | California |
| 69 | Rosalind Smith | 40 | wife | — | Georgia |
| 70 | Kinear Smith | 12 | son | — | California |
| 71 | Susanne Smith | 5 | daughter | — | California |
| 72 | Hilda Olson | 56 | servant | Maid | Sweden |
| 73 | F. W. Herb | 70 | Head | Manager | Germany |
| 74 | Emily Herb | 58 | wife | — | Ohio |
| 75 | Alice Carson | 38 | daughter | — | Illinois |
| 76 | Wm Carson | 8 | grandson | — | California |
| 77 | Margaret Suggs | 60 | servant | Cook | Australia |
| 78 | Guy C. Calden | 64 | Head | Attorney | California |
| 79 | Mary Calden | 52 | wife | — | California |
| 80 | Willard Calden | 27 | son | Physician | California |
Pedigree Summary
John + 2 siblings
Gen 1 · 5 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)