JD
John Dempsey — 1940 US Census Record
Model Tree available1940 United States Federal Census · Erie-County, New York
Our Model Tree links this John Dempsey across the 1920, 1930 and 1940 US Censuses in Erie-County, New York (XGBoost, ~Confirmed), with identified parents Leo — first a head (b.~1910), then head of a 5-person household.
Age 30
b. ~1910
Male
Head
Born: New York
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Erie-County, New York |
| Surname | Dempsey |
| Given Name | John R. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | New York |
| 1935 Residence (City) | Village of Lancaster |
| 1935 Residence (County) | Erie |
| Additional Details | |
| Occupation | Insurance Agt |
| Industry | Life Ins. Co. |
| Class of Worker | PW |
| Hours Worked | 45 |
| Income (1939) | 3500 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Insurance Agent |
| Township / Ward | Village Of Lancaster |
| 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 |
|---|---|---|---|---|
| John Dempsey | Head | — | 30 | ~1910 |
| Ethelmarie Dempsey | Spouse | — | 28 | ~1912 |
| James Dempsey | Son | — | 1 | ~1939 |
| Mary Dempsey | Daughter | — | 3 | ~1937 |
| Terrence Dempsey | Son | — | ~1940 |
Census Appearances
1920
Erie, New …
Son, age 9
Erie, New York · implied b. ~1911 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | John R |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Erie, New …
Son, age 20
Erie, New York · implied b. ~1910 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | John R. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Occupation | salesman |
| Industry | drug store |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Erie-County, New …
Head, age 30
Erie-County, New York · implied b. ~1910 — 5 household members
| Surname | Dempsey |
| Given Name | John R. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | New York |
| 1935 Residence (City) | Village of Lancaster |
| 1935 Residence (County) | Erie |
| Occupation | Insurance Agt |
| Industry | Life Ins. Co. |
| Class of Worker | PW |
| Hours Worked | 45 |
| Income (1939) | 3500 |
| Highest Grade | Hs 4 |
| 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 Dempsey across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Leo Dempsey (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Leo Dempsey
b. ~1883
Source father
● Household
· direct · ~0.92
This person
Anchor record
John Dempsey
Head · 1940 · age 30 · b. ~1910 · New York
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Erie-County, New York
Open full size
1940 US Federal Census — Erie-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02529-00808)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John R. Dempsey THIS PERSON | 30 | Head | Insurance Agt | New York |
| 2 | Ethelmarie Dempsey | 28 | Wife | — | New York |
| 3 | Mary B. Dempsey | 3 | Daughter | — | New York |
| 4 | James P. Dempsey | 1 | Son | — | New York |
| 5 | Terrence M. Dempsey | 0 | Son | — | New York |
| 6 | Clarence G. Schmahl | 50 | Head | Dist Mgr | New York |
| 7 | Amelia Schmahl | 48 | Wife | — | New York |
| 8 | Lorna Schmahl | 25 | Daughter | New Worker | New York |
| 9 | Gordon Schmahl | 22 | Son | Labour | New York |
| 10 | Jean Schmahl | 14 | Daughter | — | New York |
| 11 | John Slasher | 52 | Head | — | New York |
| 12 | Wilfred A. Maccallum | 52 | Head | Pattern Maker | Canada English |
| 13 | Alice N. Maccallum | 47 | Wife | — | Canada English |
| 14 | Allison Maccallum | 25 | Son | Salesman | Canada English |
| 15 | Helen Maccallum | 20 | Daughter | — | Canada English |
| 16 | Alvin G. Gerardin | 44 | Head | Carpenter | New York |
| 17 | Loretta H. Gerardin | 40 | Wife | — | New York |
| 18 | Alvin J. Gerardin | 20 | Son | New Worker | New York |
| 19 | Eileen A. Gerardin | 18 | Daughter | Clerk | New York |
| 20 | Alice J. Gerardin | 16 | Daughter | — | New York |
| 21 | Dorothy M. Gerardin | 11 | Daughter | — | New York |
| 22 | Joseph Kennedy | 40 | Head | Maint Repr | Alabama |
| 23 | Evelyn Kennedy | 36 | Wife | Telephone Opr | England |
| 24 | Evelyn J. Kennedy | 15 | Daughter | — | New York |
| 25 | Robert M. Kennedy | 13 | Son | — | New York |
| 26 | Margaret Jerred | 63 | Mother-in-law | — | England |
| 27 | Joseph Faulhaber | 50 | Head | Machinist | New York |
| 28 | Antoinette M. Faulhaber | 46 | Wife | — | New York |
| 29 | Raymond G. Faulhaber | 22 | Son | — | New York |
| 30 | George F. Faulhaber | 20 | Son | N.Y.A. Labor | New York |
| 31 | Joseph J. Faulhaber | 16 | Son | — | New York |
| 32 | Francis X. Faulhaber | 13 | Son | — | New York |
| 33 | Antoinette J. Faulhaber | 11 | Daughter | — | New York |
| 34 | Annamarie Faulhaber | 8 | Daughter | — | New York |
| 35 | Philis J. Faulhaber | 6 | Daughter | — | New York |
| 36 | George F. Gerardin | 73 | Father-in-law | — | New York |
| 37 | Joseph G. Kehoe | 50 | Head | Treasurer | Canada English |
| 38 | Sarah J. Kehoe | 50 | Wife | — | Canada English |
| 39 | Helen B. Kehoe | 20 | Daughter | — | Canada English |
| 40 | Randall S. Sylvis | 36 | Head | Electrician | Penna |
Pedigree Summary
John
Gen 1 · 1 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)