JM
James Mack — 1940 US Census Record
Linked across censuses1940 United States Federal Census · San-Francisco-County, California
Our Model Tree links this James Mack across the 1930 and 1940 US Censuses in San-Francisco-County, California (XGBoost, ~Confirmed) — first a son (b.~1915), then head of a 8-person household.
Age 25
b. ~1915
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Francisco-County, California |
| Surname | Mack |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Additional Details | |
| Occupation | News Vendor |
| Industry | Newspaper Press |
| Class of Worker | PW |
| Hours Worked | 20 |
| Income (1939) | 289 |
| Highest Grade | C 4 |
| 1935 Residence | Same Place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | News Vendor |
| Township / Ward | San Francisco |
| Est. Birth Year | ~1915 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| Marion Mack | Daughter | — | 12 | ~1928 |
| Lawrence Mack | Son | — | 15 | ~1925 |
| George Mack | Son | — | 10 | ~1930 |
| Stanley Mack | Son | — | 21 | ~1919 |
| Alice Mack | Spouse | — | 50 | ~1890 |
| James Mack | Head | — | 61 | ~1879 |
| Lucille Mack | Daughter | — | 4 | ~1936 |
| James Mack | Son | — | 25 | ~1915 |
Census Appearances
1930
San Francisco, …
Son, age 15
San Francisco, California · implied b. ~1915 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Machi |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Italy |
| Mother's Birthplace | Italy |
| Occupation | Helper |
| Industry | Sheet Metal |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Francisco-County, California
Son, age 25
San-Francisco-County, California · implied b. ~1915 — 8 household members
| Surname | Mack |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Francisco |
| 1935 Residence (County) | San Francisco |
| Occupation | News Vendor |
| Industry | Newspaper Press |
| Class of Worker | PW |
| Hours Worked | 20 |
| Income (1939) | 289 |
| Highest Grade | C 4 |
| 1935 Residence | Same Place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
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 James Mack across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Mack
Son · 1940 · age 25 · b. ~1915 · California
★ You are viewing this record
Sibling
Stanley Mack
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Mack
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marion Mack
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lawrence Mack
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lucille Mack
Sibling · 1940 · age 4
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 — San-Francisco-County, California
Open full size
1940 US Federal Census — San-Francisco-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00311-00352)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Alice F. Felt | 64 | Head | — | Illinois |
| 42 | Ellasmith H. Ulrich | 56 | Lodger | Elevator Operator | West Virginia |
| 43 | Martha Seaman | 56 | Lodger | Domestic | Czechoslovakia |
| 44 | Thomas P. Regan | 72 | Head | Salesman | Indiana |
| 45 | Eleanor Regan | 66 | Wife | — | Canada-English |
| 46 | Mary Riddle | 57 | Head | — | Illinois |
| 47 | Alice Riddle | 35 | Daughter | Stenographer | California |
| 48 | Abbie Phillips | 47 | Sister | Packer | Illinois |
| 49 | Edwin Krug | 46 | Head | Salesman | Ohio |
| 50 | Helena Krug | 45 | Wife | — | California |
| 51 | Theodora Krug | 23 | Daughter | Clerical | California |
| 52 | Helene Krug | 18 | Daughter | — | California |
| 53 | Betty Krug | 15 | Daughter | — | California |
| 54 | William J. Leman | 35 | Head | Truck Driver | Illinois |
| 55 | Mildred Leman | 32 | Wife | Stenographer | Iowa |
| 56 | Peter Garcia | 34 | Head | Yard Clerk | California |
| 57 | Evelyn Garcia | 27 | Wife | — | California |
| 58 | Dolores Garcia | 5 | Daughter | — | California |
| 59 | Frank Curtis | 54 | Head | Structural Steel Worker | New Hampshire |
| 60 | Elizabeth Curtis | 52 | Wife | — | Canada-English |
| 61 | Geraldine Curtis | 19 | Daughter | Cosmetologist | Canada-English |
| 62 | Katherine Foster | 38 | Head | — | Montana |
| 63 | Glenn Foster | 15 | Son | — | California |
| 64 | Clifford Foster | 14 | Son | — | California |
| 65 | Eva Rodgers | 23 | Head | — | Indiana |
| 66 | James Mack | 61 | Head | Truck Driver | North Carolina |
| 67 | Alice Mack | 50 | Wife | — | California |
| 68 | James Mack THIS PERSON | 25 | Son | News Vendor | California |
| 69 | Stanley Mack | 21 | Son | Janitor | California |
| 70 | Lawrence Mack | 15 | Son | — | California |
| 71 | Marion Mack | 12 | Daughter | — | California |
| 72 | George Mack | 10 | Son | — | California |
| 73 | Lucille Mack | 4 | Daughter | — | California |
| 74 | Margaret Harford | 64 | Head | — | California |
| 75 | Melvin Harford | 39 | Son | Chauffeur | California |
| 76 | Melios Levsky | 50 | Head | Waiter | Bulgaria |
| 77 | Ida A. Levsky | 29 | Wife | — | Utah |
| 78 | George Levsky | 2 | Son | — | California |
| 79 | John Levsky | 1 | Son | — | California |
| 80 | Elzy Miller | 48 | Head | Cook | Arkansas |
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)