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John Corcoran — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Perkins-County, South Dakota
Our Model Tree links this John Corcoran across the 1930 and 1940 US Censuses in Perkins-County, South Dakota (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 10-person household.
Age 11
b. ~1929
Male
Son
Born: South Dakota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Perkins-County, South Dakota |
| Surname | Corcoran |
| Given Name | John R |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | South Dakota |
| 1935 Residence (City) | Lemmon City |
| 1935 Residence (County) | Perkins |
| Additional Details | |
| Highest Grade | S 3 |
| 1935 Residence | Same Place |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
| Township / Ward | Lemmon City |
| Est. Birth Year | ~1929 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Alice Corcoran | Spouse | — | 34 | ~1906 |
| Steven Corcoran | Head | — | 50 | ~1890 |
| Dorothy Corcoran | Daughter | — | ~1940 | |
| Earl Corcoran | Son | — | 20 | ~1920 |
| Bernice Corcoran | Daughter | — | 9 | ~1931 |
| Lila Corcoran | Daughter | — | 5 | ~1935 |
| Margaret Corcoran | Daughter | — | 13 | ~1927 |
| Edward Corcoran | Son | — | 6 | ~1934 |
| James Corcoran | Son | — | 7 | ~1933 |
| John Corcoran | Son | — | 11 | ~1929 |
Census Appearances
1930
Perkins, South …
Son, age 1
Perkins, South Dakota · implied b. ~1929 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Corcoran |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | South Dakota |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Wisconsin |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1940
Perkins-County, South …
Son, age 11
Perkins-County, South Dakota · implied b. ~1929 — 10 household members
| Surname | Corcoran |
| Given Name | John R |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | South Dakota |
| 1935 Residence (City) | Lemmon City |
| 1935 Residence (County) | Perkins |
| Highest Grade | S 3 |
| 1935 Residence | Same Place |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
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 Corcoran across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Corcoran
Son · 1940 · age 11 · b. ~1929 · South Dakota
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Sibling
James Corcoran
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Corcoran
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Corcoran
Sibling · 1940 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bernice Corcoran
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Corcoran
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lila Corcoran
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Earl Corcoran
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 — Perkins-County, South Dakota
Open full size
1940 US Federal Census — Perkins-County, South Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03866-00170)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Norma B Lien | 13 | Daughter | — | North Dakota |
| 42 | Lois B Lien | 12 | Daughter | — | North Dakota |
| 43 | Archie S Lien | 9 | Daughter | — | South Dakota |
| 44 | Herman E Shaver | 74 | Head | — | Wisconsin |
| 45 | Anne B Shaver | 22 | Daughter | — | Minnesota |
| 46 | Ida F Newell | 40 | Head | — | South Dakota |
| 47 | William H Newell | 21 | Son | Mechanic | South Dakota |
| 48 | James A Newell | 19 | Son | Mechanic | North Dakota |
| 49 | Lucille D Newell | 17 | Daughter | — | South Dakota |
| 50 | Raymond E Newell | 15 | Son | — | South Dakota |
| 51 | David Williams | 83 | Head | — | Illinois |
| 52 | Erwin H Knittel | 34 | Head | Sheep Herder | South Dakota |
| 53 | Clara J Knittel | 36 | Wife | — | South Dakota |
| 54 | Herman W Baumgarten | 41 | Head | Laborer | Wisconsin |
| 55 | Martha V Baumgarten | 25 | Wife | — | North Dakota |
| 56 | Janet Baumgarten | 3 | Daughter | — | South Dakota |
| 57 | Jeanette Baumgarten | 3 | Daughter | — | South Dakota |
| 58 | Irving J Finney | 38 | Lodger | Sheep Herder | Wisconsin |
| 59 | Steven Corcoran | 50 | Head | Laborer | Wisconsin |
| 60 | Alice E Corcoran | 34 | Wife | — | Wisconsin |
| 61 | Earl A Corcoran | 20 | Son | Trucker | South Dakota |
| 62 | Margaret L Corcoran | 13 | Daughter | — | South Dakota |
| 63 | John R Corcoran THIS PERSON | 11 | Son | — | South Dakota |
| 64 | Bernice H Corcoran | 9 | Daughter | — | South Dakota |
| 65 | James M Corcoran | 7 | Son | — | South Dakota |
| 66 | Edward R Corcoran | 6 | Son | — | South Dakota |
| 67 | Lila M Corcoran | 5 | Daughter | — | South Dakota |
| 68 | Dorothy J Corcoran | 0 | Daughter | — | South Dakota |
| 69 | Arthur F Newell | 46 | Head | Mechanic | South Dakota |
| 70 | Thresia M Newell | 36 | Wife | — | Nebraska |
| 71 | Archie W Newell | 18 | Son | Worker | South Dakota |
| 72 | Laura M Newell | 13 | Daughter | — | South Dakota |
| 73 | Joyce E Newell | 8 | Daughter | — | South Dakota |
| 74 | David K Myers | 36 | Head | Clergyman | Illinois |
| 75 | Johanna B Myers | 36 | Wife | — | Scotland |
| 76 | Ruth M Myers | 7 | Daughter | — | Montana |
| 77 | Mary M Myers | 5 | Daughter | — | South Dakota |
| 78 | John A Myers | 3 | Son | — | South Dakota |
| 79 | James S Rook | 37 | Head | Recreation Leader | South Dakota |
| 80 | Inga M Rook | 29 | Wife | — | South Dakota |
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)