JM
John Mack — 1940 US Census Record
Model Tree available1940 United States Federal Census · Schenectady-County, New York
Our Model Tree links this John Mack across the 1920, 1930 and 1940 US Censuses in Schenectady-County, New York (XGBoost, ~Confirmed), with identified parents Joseph & Jacob — first a son (b.~1913), then head of a 7-person household.
Age 27
b. ~1913
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Schenectady-County, New York |
| Surname | Mack |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Rotterdam |
| 1935 Residence (County) | Schenectady |
| Additional Details | |
| Occupation | Stock Clerk |
| Industry | Wholesale Dept. Store |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 2832 |
| Highest Grade | H-3 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Stock Clerk |
| Township / Ward | Rotterdam |
| Est. Birth Year | ~1913 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Theodore Mack | Head | — | 52 | ~1888 |
| Albert Mack | Son | — | 19 | ~1921 |
| Ann Mack | Daughter | — | 23 | ~1917 |
| Leonard Mack | Son | — | 19 | ~1921 |
| Edmond Mack | Son | — | 17 | ~1923 |
| Mary Mack | Spouse | — | 51 | ~1889 |
| John Mack | Son | — | 27 | ~1913 |
Census Appearances
1920
Saratoga, New …
Son, age 6
Saratoga, New York · implied b. ~1914 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mac |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read | Yes |
| Speaks English | Yes |
| Mother Tongue | Polish |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Saratoga, New …
Son, age 16
Saratoga, New York · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mack |
| Given Name | John E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | Laborer |
| Industry | Garage |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Schenectady-County, New …
Son, age 27
Schenectady-County, New York · implied b. ~1913 — 7 household members
| Surname | Mack |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Rotterdam |
| 1935 Residence (County) | Schenectady |
| Occupation | Stock Clerk |
| Industry | Wholesale Dept. Store |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 2832 |
| Highest Grade | H-3 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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 Mack across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Joseph Mack (~0.92 confidence) and father Jacob Mac (~0.92 confidence) and mother Helen Mac (~0.92 confidence) and father Theodore Mack (~0.92 confidence) and mother Mary Mack (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Joseph Mack
b. ~1875
Source father
● Household
· direct · ~0.92
Father
Jacob Mac
b. ~1884
Source father
● Household
· direct · ~0.92
Mother
Helen Mac
b. ~1888
Source mother
● Household
· direct · ~0.92
Father
Theodore Mack
b. ~1888
Source father
● Household
· direct · ~0.92
Mother
Mary Mack
b. ~1889
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mack
Son · 1940 · age 27 · b. ~1913 · New York
★ You are viewing this record
Sibling
Ann Mack
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edmond Mack
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Albert Mack
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leonard 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 — Schenectady-County, New York
Open full size
1940 US Federal Census — Schenectady-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02774-00748)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Florence E. Burns | 37 | Wife | — | New York |
| 42 | Elton L. Burns | 13 | Son | — | New York |
| 43 | Arlene L. Burns | 9 | Daughter | — | New York |
| 44 | Albert Korn | 52 | Head | Toolmaker | Bohemia |
| 45 | Gertrude Korn | 48 | Wife | — | Germany |
| 46 | Werner Hillman | 22 | Son | Tool Designer | New York |
| 47 | Andrew Mccartney | 52 | Head | Stock Keeper | Northern Ireland |
| 48 | Margaret H. Mccartney | 51 | Wife | — | New York |
| 49 | Robert Mccartney | 21 | Son | Apprentice Machinist | New York |
| 50 | Theodore Mack | 52 | Head | Boiler Maker | Russia |
| 51 | Mary Mack | 51 | Wife | Dish Washer | Germany |
| 52 | John Mack THIS PERSON | 27 | Son | Stock Clerk | New York |
| 53 | Ann Mack | 23 | Daughter | Clerical Wk. | New York |
| 54 | Leonard Mack | 19 | Son | Clerical Wk. | New York |
| 55 | Albert Mack | 19 | Son | New Worker | New York |
| 56 | Edmond Mack | 17 | Son | — | New York |
| 57 | Ernest Applequist | 51 | Head | Machinist | Sweden |
| 58 | Ellen Applequist | 48 | Wife | — | New York |
| 59 | Roy Applequist | 17 | Son | — | Minnesota |
| 60 | Ellen Applequist | 16 | Daughter | — | New York |
| 61 | Mary Applequist | 14 | Daughter | — | New York |
| 62 | James Applequist | 13 | Son | — | New York |
| 63 | Edward Anderson | 51 | Head | Accountant | New York |
| 64 | Clara Anderson | 49 | Wife | Saleslady | New York |
| 65 | Mary Gleason | 49 | Head | Armature Winder | New York |
| 66 | Amelia Sells | 40 | Head | — | New York |
| 67 | Carl Sells | 22 | Son | Production Man | New York |
| 68 | George Sells | 21 | Son | — | New York |
| 69 | John Sells | 19 | Son | New Worker | New York |
| 70 | Herman Voigt | 70 | Father | — | Germany |
| 71 | James Neary | 64 | Head | Machinist | New York |
| 72 | Edna Neary | 57 | Wife | — | New York |
| 73 | Gertrude Neary | 18 | Daughter | — | New York |
| 74 | Gordon Neary | 18 | Son | — | New York |
| 75 | Peter La Malfa | 23 | Head | Barber | New York |
| 76 | Helen La Malfa | 26 | Wife | Salesgirl | New York |
| 77 | Harold E. Boink | 28 | Head | Janitor | New York |
| 78 | Mildred Boink | 25 | Wife | — | New York |
| 79 | Frederick Hudson | 41 | Head | Laborer | New York |
| 80 | Edna Hudson | 41 | Wife | — | New York |
Pedigree Summary
John + 4 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)