JM
James Mack — 1940 US Census Record
Linked across censuses1940 United States Federal Census · St.-Louis-City-County, Missouri
Our Model Tree links this James Mack across the 1930 and 1940 US Censuses in St.-Louis-City-County, Missouri (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 9-person household.
Age 17
b. ~1923
Male
Son
Born: Missouri
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | St.-Louis-City-County, Missouri |
| Surname | Mack |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | St. Louis (City) |
| 1935 Residence (County) | St. Louis City |
| Additional Details | |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Township / Ward | St Louis City |
| Est. Birth Year | ~1923 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| William Mack | Son | — | 23 | ~1917 |
| Mary Mack | Daughter | — | 32 | ~1908 |
| Angela Mack | Daughter | — | 11 | ~1929 |
| James Mack | Son | — | 17 | ~1923 |
| Robert Mack | Son | — | 21 | ~1919 |
| Richard Mack | Son | — | 19 | ~1921 |
| John Mack | Head | — | 56 | ~1884 |
| Francis Mack | Son | — | 13 | ~1927 |
| Mary Mack | Spouse | — | 55 | ~1885 |
Census Appearances
1930
St Louis, …
Son, age 10
St Louis, Missouri · implied b. ~1920 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mack |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Can Read/Write | Yes |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
St.-Louis-City-County, Missouri
Son, age 17
St.-Louis-City-County, Missouri · implied b. ~1923 — 9 household members
| Surname | Mack |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | St. Louis (City) |
| 1935 Residence (County) | St. Louis City |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
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 17 · b. ~1923 · Missouri
★ You are viewing this record
Sibling
Angela Mack
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Mack
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mack
Sibling · 1940 · age 32
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Mack
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Mack
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Mack
Sibling · 1940 · age 19
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 — St.-Louis-City-County, Missouri
Open full size
1940 US Federal Census — St.-Louis-City-County, Missouri
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02211-00713)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Henry Levin | 25 | Son | Salesman | Missouri |
| 2 | Ethel Conrad | 41 | Head | Housekeeper | Illinois |
| 3 | Mary Conrad | 17 | Daughter | — | Missouri |
| 4 | Joseph Sherwood | 57 | Boarder | Chemist | New York |
| 5 | Franklin Sherwood | 22 | Boarder | New Yorker | New York |
| 6 | Fred G. Davidson | 29 | Boarder | Salesman | Missouri |
| 7 | John H. Mack | 56 | Head | Freight Agent | Texas |
| 8 | Mary Mack | 55 | Wife | — | Missouri |
| 9 | Mary K. Mack | 32 | Daughter | — | Missouri |
| 10 | William Mack | 23 | Son | Clerk | Missouri |
| 11 | Robert C. Mack | 21 | Son | Leather-Striker | Missouri |
| 12 | Richard L. Mack | 19 | Son | Stock Clerk | Missouri |
| 13 | James Mack THIS PERSON | 17 | Son | — | Missouri |
| 14 | Francis Mack | 13 | Son | — | Missouri |
| 15 | Angela Mack | 11 | Daughter | — | Missouri |
| 16 | Jack Rubin | 37 | Head | Bookkeeper | Russia |
| 17 | Betty Rubin | 32 | Wife | — | Missouri |
| 18 | Robert Rubin | 9 | Son | — | Missouri |
| 19 | Laurence E. Rubin | 5 | Son | — | Missouri |
| 20 | Sam Sr. Digregorio | 61 | Head | Grocer | Italy |
| 21 | Rose Digregorio | 55 | Wife | Grocer | Italy |
| 22 | Dora Digregorio | 28 | Daughter | — | Missouri |
| 23 | Mary Lou Digregorio | 25 | Daughter | Fur Finisher | Missouri |
| 24 | Patte Digregorio | 23 | Son | Clerk | Missouri |
| 25 | Sam Jr. Digregorio | 19 | Son | Clerk | Missouri |
| 26 | Bessie Swearingen | 54 | Head | Lodging House | Iowa |
| 27 | Pearl Grady | 35 | Daughter | Secretary | Iowa |
| 28 | Troy P. Taylor | 32 | Roomer | Clerk | Arkansas |
| 29 | Elizabeth A. Taylor | 32 | Roomer | — | Arkansas |
| 30 | Gladys Wist | 37 | Roomer | Stenographer | Missouri |
| 31 | Ottie Wist | 69 | Roomer | — | Missouri |
| 32 | Muriel E. Simpson | 32 | Roomer | Comptometer Operator | Illinois |
| 33 | Philip R. Varney | 37 | Boarder | Bacteriologist | Oregon |
| 34 | Jewell Varney | 29 | Boarder | Saleswoman | Missouri |
| 35 | Edna V. Knobel | 46 | Boarder | Stenographer | Illinois |
| 36 | Edmund C. Steining | 52 | Boarder | Salesman | Illinois |
| 37 | Mary E. Joice | 70 | Head | — | Missouri |
| 38 | Gerald D. Joice | 45 | Son | Civil Engineer | Missouri |
| 39 | Robert J. Joice | 36 | Son | Engineer | Missouri |
| 40 | Dorothy Joice | 33 | Daughter | Research Agent | Missouri |
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)