JD
James Dempsey — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this James Dempsey across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents John & Annie — first a son (b.~1916), then head of a 5-person household.
Age 24
b. ~1916
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Dempsey |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Shipping clerk |
| Industry | Shoe plant |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 700 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Shipping Clerk |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1916 |
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 James | Age | Birth yr |
|---|---|---|---|---|
| John Punch | Other | — | 80 | ~1860 |
| Helen Dempsey | Head | — | 54 | ~1886 |
| Martin Dempsey | Son | — | 20 | ~1920 |
| James Dempsey | Son | — | 24 | ~1916 |
| Mary Dempsey | Daughter | — | 22 | ~1918 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 2
Middlesex, Massachusetts · implied b. ~1918 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | James |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | none |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 13
Middlesex, Massachusetts · implied b. ~1917 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dempsey |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 24
Middlesex-County, Massachusetts · implied b. ~1916 — 5 household members
| Surname | Dempsey |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Occupation | Shipping clerk |
| Industry | Shoe plant |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 700 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Dempsey across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Dempsey (~0.92 confidence) and mother Annie Dempsey (~0.92 confidence) and mother Helen Dempsey (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Dempsey
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Annie Dempsey
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Helen Dempsey
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Dempsey
Son · 1940 · age 24 · b. ~1916 · Massachusetts
★ You are viewing this record
Sibling
Mary Dempsey
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martin Dempsey
Sibling · 1940 · age 20
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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01702-00078)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Helen Dempsey | 54 | Head | — | Massachusetts |
| 42 | James Dempsey THIS PERSON | 24 | Son | Shipping Clerk | Massachusetts |
| 43 | Mary Dempsey | 22 | Daughter | — | Massachusetts |
| 44 | Martin Dempsey | 20 | Son | — | Massachusetts |
| 45 | John Punch | 80 | Father | — | New Hampshire |
| 46 | Bella Kendall | 51 | Head | Servant | Nova Scotia |
| 47 | Alberta Kendall | 26 | Daughter | — | New Hampshire |
| 48 | Gertrude Kendall | 23 | Daughter | Cook | New Hampshire |
| 49 | John Kendall | 18 | Son | — | New Hampshire |
| 50 | William Nicholson | 74 | Head | — | Canada English |
| 51 | Janet Nicholson | 62 | Wife | — | New Hampshire |
| 52 | John Driscoll | 51 | Head | Foreman | Massachusetts |
| 53 | Mary Driscoll | 41 | Wife | — | Eire |
| 54 | Rene Driscoll | 10 | Son | — | Massachusetts |
| 55 | June Driscoll | 8 | Daughter | — | Massachusetts |
| 56 | John Blazo | 44 | Lodger | Laborer | New Hampshire |
| 57 | Dimitrios Randylella | 41 | Head | Foreman | Greece |
| 58 | Adella Randylella | 50 | Wife | — | Massachusetts |
| 59 | Charles Mccloney | 69 | Head | Realtor | Canada English |
| 60 | Jessie Mccloney | 60 | Wife | — | Massachusetts |
| 61 | Roy Mccloney | 31 | Son | — | Massachusetts |
| 62 | Kingman Mccloney | 29 | Son | Realtor | Massachusetts |
| 63 | Robert Mccloney | 23 | Son | Sales Clerk | Massachusetts |
| 64 | Robert Mccloney | 3 | Grandson | — | Massachusetts |
| 65 | William Mapleson | 57 | Head | Foreman | England |
| 66 | Margaret Mapleson | 51 | Wife | — | New Hampshire |
| 67 | Lottie Bates | 23 | Daughter | — | Canada English |
| 68 | Frederick Bates | 24 | Son-in-law | Clerk | New Hampshire |
| 69 | William Bates | 0 | Son | — | Massachusetts |
| 70 | Peter Grundy | 47 | Head | Clerk | Massachusetts |
| 71 | Nellie Grundy | 27 | Wife | Clerk | Massachusetts |
| 72 | Christine Mello | 85 | Mother-in-law | — | Portugal |
| 73 | William Sanders | 39 | Head | Truck Driver | Connecticut |
| 74 | Miriam Sanders | 36 | Wife | — | Massachusetts |
| 75 | Joseph Sanders | 16 | Son | — | Massachusetts |
| 76 | William Sanders | 13 | Son | — | Massachusetts |
| 77 | Elmer Weldon | 28 | Head | Finisher | Massachusetts |
| 78 | Alice Weldon | 24 | Wife | — | Massachusetts |
| 79 | Robert Weldon | 0 | Son | — | Massachusetts |
| 80 | Isabel Chisholm | 53 | Head | — | Canada English |
Pedigree Summary
James + 2 siblings
Gen 1 · 3 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)