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James Dunlap — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Lucas-County, Iowa
Our Model Tree links this James Dunlap across the 1930 and 1940 US Censuses in Lucas-County, Iowa (XGBoost, ~Confirmed) — first a son (b.~1930), then head of a 8-person household.
Age 10
b. ~1930
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lucas-County, Iowa |
| Surname | Dunlap |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Chariton City |
| 1935 Residence (County) | Lucas County |
| Additional Details | |
| Highest Grade | No 3 |
| 1935 Residence | Same house |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Chariton City |
| Est. Birth Year | ~1930 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Jessie Dunlap | Spouse | — | 38 | ~1902 |
| Emma Dunlap | Daughter | — | ~1940 | |
| James Dunlap | Son | — | 10 | ~1930 |
| George Dunlap | Head | — | 42 | ~1898 |
| Samuel Dunlap | Son | — | 7 | ~1933 |
| George Dunlap | Son | — | 12 | ~1928 |
| Carl Dunlap | Son | — | 5 | ~1935 |
| Chester Dunlap | Son | — | 6 | ~1934 |
Census Appearances
1930
Lucas, Iowa
Other, age 1
Lucas, Iowa · implied b. ~1929 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dunlap |
| Given Name | James |
| Relationship to Head | Grandson |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Lucas-County, Iowa
Son, age 10
Lucas-County, Iowa · implied b. ~1930 — 8 household members
| Surname | Dunlap |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Chariton City |
| 1935 Residence (County) | Lucas County |
| Highest Grade | No 3 |
| 1935 Residence | Same house |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Dunlap across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
James Dunlap
Son · 1940 · age 10 · b. ~1930 · Iowa
★ You are viewing this record
Sibling
Samuel Dunlap
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Emma Dunlap
Sibling · 1940 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Dunlap
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Carl Dunlap
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Chester Dunlap
Sibling · 1940 · age 6
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 — Lucas-County, Iowa
Open full size
1940 US Federal Census — Lucas-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01178-00524)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Charles Moore | 54 | Head | Salesman | Missouri |
| 2 | Nira Moore | 54 | Wife | — | Missouri |
| 3 | Vivian Moore | 18 | Daughter | — | Iowa |
| 4 | Lloyd Moore | 30 | Son | Repair Man | Iowa |
| 5 | Ruth Moore | 25 | Wife | — | Iowa |
| 6 | Earl Moore | 6 | Son | — | Iowa |
| 7 | Jerry Moore | 2 | Son | — | Iowa |
| 8 | John Beidel | 76 | Head | — | Ohio |
| 9 | Mary L. Beidel | 73 | Wife | — | Indiana |
| 10 | A. J. Spears | 75 | Head | — | Virginia |
| 11 | Edward Gray | 31 | Head | Operates Oil Station | Iowa |
| 12 | Martha Gray | 26 | Wife | — | Iowa |
| 13 | Velma Gray | 10 | Daughter | — | Iowa |
| 14 | Gilda Gray | 7 | Daughter | — | Iowa |
| 15 | Seymour Gray | 3 | Son | — | Iowa |
| 16 | George Dunlap | 42 | Head | Bridge Carpenter | Missouri |
| 17 | Jessie Dunlap | 38 | Wife | — | Iowa |
| 18 | George Dunlap | 12 | Son | — | Iowa |
| 19 | James Dunlap THIS PERSON | 10 | Son | — | Iowa |
| 20 | Samuel Dunlap | 7 | Son | — | Iowa |
| 21 | Chester Dunlap | 6 | Son | — | Iowa |
| 22 | Carl Dunlap | 5 | Son | — | Iowa |
| 23 | Emma Dunlap | 0 | Daughter | — | Iowa |
| 24 | Harriet Shore | 79 | Head | — | Iowa |
| 25 | H. L. Viavender | 77 | Head | — | Iowa |
| 26 | Marie Viavender | 37 | Daughter | Teacher | Iowa |
| 27 | Nelson Theobald | 61 | Lodger | — | — |
| 28 | Nell Richards | 53 | Head | — | Iowa |
| 29 | Thelma Richards | 32 | Daughter | Stenographer | Iowa |
| 30 | Chester Richards | 25 | Son | Attendant | Iowa |
| 31 | John Shriner | 37 | Head | Salesman | Iowa |
| 32 | Helen Shriner | 40 | Wife | — | Kansas |
| 33 | Lyle Shriner | 14 | Son | — | Iowa |
| 34 | J. H. Davidson | 65 | Head | — | Nebraska |
| 35 | Ida M. Davidson | 63 | Wife | — | Iowa |
| 36 | R. E. Evans | 71 | Head | — | Missouri |
| 37 | Nellie Evans | 63 | Wife | — | England |
| 38 | William Evans | 40 | Son | Road Work | Iowa |
| 39 | Thomas Evans | 34 | Son | — | Iowa |
| 40 | Archie Sipes | 30 | Head | Farm | Iowa |
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)