RM
Robert Mccormick — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Dickinson-County, Iowa
Our Model Tree links this Robert Mccormick across the 1930 and 1940 US Censuses in Dickinson-County, Iowa (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 7-person household.
Age 20
b. ~1920
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Dickinson-County, Iowa |
| Surname | McCormick |
| Given Name | Robert L |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Buena Vista |
| 1935 Residence (County) | Buena Vista |
| Additional Details | |
| Occupation | Labor |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 60 |
| Income (1939) | 888 |
| Highest Grade | H-4 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Labor |
| Township / Ward | Center Grove |
| Est. Birth Year | ~1920 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Charles Mccormick | Head | — | 44 | ~1896 |
| Helma Mccormick | Daughter | — | 7 | ~1933 |
| Clyde Mccormick | Son | — | 5 | ~1935 |
| Robert Mccormick | Son | — | 20 | ~1920 |
| Russell Mccormick | Son | — | 15 | ~1925 |
| Opal Mccormick | Daughter | — | 17 | ~1923 |
| Helma Mccormick | Spouse | — | 45 | ~1895 |
Census Appearances
1930
Dubuque, Iowa
Son, age 9
Dubuque, Iowa · implied b. ~1921 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormick |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Dickinson-County, Iowa
Son, age 20
Dickinson-County, Iowa · implied b. ~1920 — 7 household members
| Surname | McCormick |
| Given Name | Robert L |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Buena Vista |
| 1935 Residence (County) | Buena Vista |
| Occupation | Labor |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 60 |
| Income (1939) | 888 |
| Highest Grade | H-4 |
| 1935 Residence | Iowa |
| 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 Robert Mccormick across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Mccormick
Son · 1940 · age 20 · b. ~1920 · Iowa
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Sibling
Opal Mccormick
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helma Mccormick
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Clyde Mccormick
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Russell Mccormick
Sibling · 1940 · age 15
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 — Dickinson-County, Iowa
Open full size
1940 US Federal Census — Dickinson-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01157-00118)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Gladys M Ogle | 35 | Wife | Secretary | Iowa |
| 42 | Betty M Ogle | 13 | Daughter | — | Minnesota |
| 43 | Floyd R Ogle | 11 | Son | — | Iowa |
| 44 | Mary J Ogle | 10 | Daughter | — | Iowa |
| 45 | Marilyn J Ogle | 1 | Daughter | — | Iowa |
| 46 | E. A. Hendrick | 55 | Head | Secretary | Iowa |
| 47 | Junia S Hendrick | 55 | Wife | Clerical Work | Iowa |
| 48 | Doris L Ahrens | 18 | Hired Girl | Housework | Minnesota |
| 49 | Raymond S Elston | 24 | Head | Labor | Iowa |
| 50 | Annabell S Elston | 23 | Wife | — | Iowa |
| 51 | Albert M Munsey | 49 | Head | Labor | Iowa |
| 52 | Mertle G Munsey | 44 | Wife | — | Iowa |
| 53 | Mattias A Munsey | 17 | Son | Labor | Iowa |
| 54 | Stuart O Sturdevant|Sturdevier | 42 | Head | Farmer | Iowa |
| 55 | Cleo O Sturdevant|Sturdevier | 35 | Wife | — | Iowa |
| 56 | Susan B Sturdevant|Sturdevier | 7 | Daughter | — | Iowa |
| 57 | Milton K Sturdevant|Sturdevier | 4 | Son | — | Iowa |
| 58 | John H Sturdevant|Sturdevier | 2 | Son | — | Iowa |
| 59 | Paul N Sturdevant|Sturdevier | 48 | Brother | — | Iowa |
| 60 | Charles L Mccormick | 44 | Head | Farmer | Nebraska |
| 61 | Helma S Mccormick | 45 | Wife | — | Iowa |
| 62 | Robert L Mccormick THIS PERSON | 20 | Son | Labor | Iowa |
| 63 | Opal J Mccormick | 17 | Daughter | — | Iowa |
| 64 | Russell C Mccormick | 15 | Son | — | Iowa |
| 65 | Helma J Mccormick | 7 | Daughter | — | Iowa |
| 66 | Clyde L Mccormick | 5 | Son | — | Iowa |
| 67 | Albert O Sterck | 33 | Head | Farmer | Iowa |
| 68 | Delma M Sterck | 32 | Wife | — | Indiana |
| 69 | Delma J Sterck | 12 | Daughter | — | California |
| 70 | Patricia M Sterck | 10 | Daughter | — | Iowa |
| 71 | Charles F Sterck | 8 | Son | — | Iowa |
| 72 | James A Sterck | 2 | Son | — | Iowa |
| 73 | John H Knoll | 53 | Head | Farmer | Iowa |
| 74 | Dora Knoll | 48 | Wife | — | Iowa |
| 75 | George Fries | 38 | Brother in law | Labor | Iowa |
| 76 | Ed A Grove | 57 | Head | W.P.A. Foreman | Iowa |
| 77 | Rose Grove | 53 | Wife | — | Iowa |
| 78 | Irwin R Frost | 44 | Head | Farmer | Iowa |
| 79 | Marian L Frost | 42 | Wife | — | Iowa |
| 80 | Keith J Frost | 20 | Son | Labor | 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)