JD
James Duffy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Ramsey-County, Minnesota
Our Model Tree links this James Duffy across the 1930 and 1940 US Censuses in Ramsey-County, Minnesota (XGBoost, ~Confirmed) — first a son (b.~1922), then head of a 14-person household.
Age 18
b. ~1922
Male
Son
Born: Minnesota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Ramsey-County, Minnesota |
| Surname | Duffy |
| Given Name | James J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | St. Paul |
| 1935 Residence (County) | Ramsey |
| Additional Details | |
| Occupation | pin setter |
| Industry | bowling alley |
| Class of Worker | PW |
| Income (1939) | 79 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
| Occupation | Pin Setter |
| Township / Ward | St Paul |
| Est. Birth Year | ~1922 |
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.
14 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Loretta Duffy | Daughter | — | 19 | ~1921 |
| Jean Duffy | Daughter | — | 13 | ~1927 |
| Anne Duffy | Daughter | — | 9 | ~1931 |
| Eileen Duffy | Daughter | — | 16 | ~1924 |
| Kathleen Duffy | Daughter | — | 5 | ~1935 |
| Margaret Duffy | Daughter | — | 4 | ~1936 |
| Leo Duffy | Head | — | 49 | ~1891 |
| Donald Duffy | Son | — | 1 | ~1939 |
| Thomas Duffy | Son | — | 11 | ~1929 |
| Jerome Duffy | Son | — | 7 | ~1933 |
| Joseph Duffy | Son | — | 8 | ~1932 |
| James Duffy | Son | — | 18 | ~1922 |
| Leo Duffy | Son | — | 12 | ~1928 |
| E Duffy | Spouse | — | 43 | ~1897 |
Census Appearances
1930
Ramsey, Minnesota
Son, age 8
Ramsey, Minnesota · implied b. ~1922 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duffy |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Minnesota |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Iowa |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
1940
Ramsey-County, Minnesota
Son, age 18
Ramsey-County, Minnesota · implied b. ~1922 — 14 household members
| Surname | Duffy |
| Given Name | James J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | St. Paul |
| 1935 Residence (County) | Ramsey |
| Occupation | pin setter |
| Industry | bowling alley |
| Class of Worker | PW |
| Income (1939) | 79 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
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 Duffy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Duffy
Son · 1940 · age 18 · b. ~1922 · Minnesota
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Sibling
Jerome Duffy
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eileen Duffy
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Loretta Duffy
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jean Duffy
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Duffy
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Duffy
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kathleen Duffy
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leo Duffy
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Duffy
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anne Duffy
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Duffy
Sibling · 1940 · age 8
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 — Ramsey-County, Minnesota
Open full size
1940 US Federal Census — Ramsey-County, Minnesota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02002-00217)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lydia Kilbane | 35 | Head | Waitress | Russia |
| 2 | John Kilbane | 17 | Son | Helper | Washington |
| 3 | George Kilbane | 15 | Son | — | Washington |
| 4 | Cathrine Kilbane | 14 | Daughter | — | Washington |
| 5 | Mary Lou Kilbane | 12 | Daughter | — | Washington |
| 6 | Mary Brantner | 30 | Sister | Cook | Russia |
| 7 | James Hoel | 18 | Lodger | Delivery Servant | Minnesota |
| 8 | Morris Lamb | 30 | Head | Laborer | Minnesota |
| 9 | Gwendolyn Lamb | 24 | Mother | — | Minnesota |
| 10 | Joan Lamb | 5 | Daughter | — | Minnesota |
| 11 | Leonard Lamb | 4 | Son | — | Minnesota |
| 12 | Morris Lamb | 1 | Son | — | Minnesota |
| 13 | Bella O'Brien | 63 | Head | — | Wisconsin |
| 14 | Leo Holberg | 22 | Son-in-law | Laborer | Minnesota |
| 15 | Lorraine Holberg | 23 | Wife | — | Minnesota |
| 16 | David Holberg | 4 | Son | — | Minnesota |
| 17 | Norman Alpert | 71 | Head | Salesman | Canada English |
| 18 | Julia Alpert | 68 | Wife | — | Wisconsin |
| 19 | E. F. Taylor | 74 | Lodger | Retired | Canada English |
| 20 | Charles N. Broker | 67 | Head | Floor Walker | Illinois |
| 21 | Mary H. Broker | 65 | Wife | — | New Jersey |
| 22 | Leo J. Duffy | 49 | Head | Locomotive Engineer | Minnesota |
| 23 | E. Loretta Duffy | 43 | Wife | — | Minnesota |
| 24 | Loretta M. Duffy | 19 | Daughter | Typist | Minnesota |
| 25 | James J. Duffy THIS PERSON | 18 | Son | Pin Setter | Minnesota |
| 26 | Eileen J. Duffy | 16 | Daughter | Typist | Minnesota |
| 27 | Jean L. Duffy | 13 | Daughter | — | Minnesota |
| 28 | Leo P. Duffy | 12 | Son | — | Minnesota |
| 29 | Thomas E. Duffy | 11 | Son | — | Minnesota |
| 30 | Anne M. Duffy | 9 | Daughter | — | Minnesota |
| 31 | Joseph B. Duffy | 8 | Son | — | Minnesota |
| 32 | Jerome M. Duffy | 7 | Son | — | Minnesota |
| 33 | Kathleen E. Duffy | 5 | Daughter | — | Minnesota |
| 34 | Margaret E. Duffy | 4 | Daughter | — | Minnesota |
| 35 | Donald R. Duffy | 1 | Son | — | Minnesota |
| 36 | Harry Keeler | 46 | Head | Broker | Iowa |
| 37 | Myrtle E. Keeler | 48 | Wife | — | Minnesota |
| 38 | Howard Mc Gougan | 49 | Head | Terminal Train Master | Minnesota |
| 39 | Eleanor Mc Gougan | 40 | Wife | — | Minnesota |
| 40 | Dan Sullivan | 49 | Head | Auto Electrician | Minnesota |
Related Census Records
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)