JD
John Dempsey — 1940 US Census Record
Linked across censuses1940 United States Federal Census · St.-Louis-City-County, Missouri
Our Model Tree links this John Dempsey across the 1930 and 1940 US Censuses in St.-Louis-City-County, Missouri (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 7-person household.
Age 20
b. ~1920
Male
Son
Born: Missouri
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | St.-Louis-City-County, Missouri |
| Surname | Dempsey |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | St. Louis City |
| 1935 Residence (County) | St. Louis City |
| Additional Details | |
| Occupation | Salesman |
| Industry | owner Business |
| Class of Worker | OA |
| Hours Worked | 40 |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Occupation | Salesman |
| Township / Ward | St Louis City |
| Est. Birth Year | ~1920 |
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 |
|---|---|---|---|---|
| Martha Dempsey | Spouse | — | 46 | ~1894 |
| Jane Dempsey | Daughter | — | 22 | ~1918 |
| John Dempsey | Son | — | 20 | ~1920 |
| David Dempsey | Son | — | 10 | ~1930 |
| John Dempsey | Head | — | 57 | ~1883 |
| Matilda Schraiffer | Other | — | 40 | ~1900 |
| Richard Dempsey | Son | — | 13 | ~1927 |
Census Appearances
1930
St Louis, …
Son, age 10
St Louis, Missouri · implied b. ~1920 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | John J. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Missouri |
| Industry | yes |
| Can Read/Write | Yes |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
St.-Louis-City-County, Missouri
Son, age 20
St.-Louis-City-County, Missouri · implied b. ~1920 — 7 household members
| Surname | Dempsey |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | St. Louis City |
| 1935 Residence (County) | St. Louis City |
| Occupation | Salesman |
| Industry | owner Business |
| Class of Worker | OA |
| Hours Worked | 40 |
| Income (1939) | 0 |
| 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 John Dempsey across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Dempsey
Son · 1940 · age 20 · b. ~1920 · Missouri
★ You are viewing this record
Sibling
David Dempsey
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Dempsey
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jane Dempsey
Sibling · 1940 · age 22
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-t0627-02195-00353)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Albert Belzing | 44 | Head | Meat Cutter | Illinois |
| 2 | Blanche Belzing | 44 | Wife | — | Missouri |
| 3 | Joan Belzing | 11 | Daughter | — | Missouri |
| 4 | Zelma Sommerfeldt | 45 | Lodger | Music Teacher | Arkansas |
| 5 | Harry H. Pohl | 30 | Head | — | Missouri |
| 6 | Louise Pohl | 24 | Wife | — | Missouri |
| 7 | Frank Kortanek | 45 | Head | Ins. Salesman | Missouri |
| 8 | Josie A. Kortanek | 54 | Sister | Asst. Purchasing Agt. | Missouri |
| 9 | John C. Mcconnell | 58 | Head | Accountant | Missouri |
| 10 | Grace G. Mcconnell | 52 | Wife | — | Illinois |
| 11 | Grace Mcconnell | 17 | Daughter | — | Missouri |
| 12 | Hazel Mcconnell | 17 | Daughter | — | Missouri |
| 13 | Loretta Hiler | 18 | Maid | Domestic | Illinois |
| 14 | Katie C. Mery | 68 | Head | Domestic | Missouri |
| 15 | Emma P. Bremsar | 50 | Partner | — | Missouri |
| 16 | Charles C. Gillers | 50 | Head | Salesman | Missouri |
| 17 | Hazel M. Gillers | 48 | Wife | — | Indiana |
| 18 | Betty Gillers | 20 | Daughter | Stenographer | Missouri |
| 19 | Bobette Gillers | 16 | Daughter | — | Missouri |
| 20 | Antoinette Zimmermann | 84 | Head | — | New York |
| 21 | Pauline Vahman | 65 | Housekeeper | Housekeeper | Missouri |
| 22 | George M. Davidson | 48 | Head | Shoe Cutter | Missouri |
| 23 | Ruth R. Davidson | 45 | Wife | — | Illinois |
| 24 | George M. Jr. Davidson | 17 | Son | — | Missouri |
| 25 | Ralph L. Davidson | 15 | Son | — | Missouri |
| 26 | John Clare | 77 | Father-in-law | — | Kentucky |
| 27 | Pearl Clare | 41 | Sister-in-law | Salesgirl | Illinois |
| 28 | George A. Mays | 74 | Lodger | — | Tennessee |
| 29 | John J. Dempsey | 57 | Head | Prop. Goods Store | Eire |
| 30 | Martha B. Dempsey | 46 | Wife | — | Missouri |
| 31 | Jane Dempsey | 22 | Daughter | — | Missouri |
| 32 | John Dempsey THIS PERSON | 20 | Son | Salesman | Missouri |
| 33 | Richard Dempsey | 13 | Son | — | Missouri |
| 34 | David Dempsey | 10 | Son | — | Missouri |
| 35 | Matilda Schraiffer | 40 | Maid | Domestic | Missouri |
| 36 | Charles W. Kahl | 52 | Head | Sales Mgr. | Missouri |
| 37 | Erna L. Kahl | 44 | Wife | — | Missouri |
| 38 | William E. Kahl | 19 | Son | — | Missouri |
| 39 | Carl A. Kahl | 16 | Son | — | Missouri |
| 40 | William Holters | 55 | Brother-in-law | Dept. Manager | 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)