RH
Robert Hoffman — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Rock-County, Minnesota
Our Model Tree links this Robert Hoffman across the 1930 and 1940 US Censuses in Rock-County, Minnesota (XGBoost, ~Confirmed) — first a son (b.~1930), then head of a 10-person household.
Age 10
b. ~1930
Male
Son
Born: Minnesota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Rock-County, Minnesota |
| Surname | Hoffman |
| Given Name | Robert M |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Rock |
| Additional Details | |
| Highest Grade | No 3 |
| 1935 Residence | Minnesota |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
| Township / Ward | Hardwick |
| 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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Roy Hoffman | Son | — | 19 | ~1921 |
| Edna Hoffman | Daughter | — | 11 | ~1929 |
| Robert Hoffman | Son | — | 10 | ~1930 |
| Mary Koll | Other | — | 70 | ~1870 |
| Adolph Hoffman | Head | — | 61 | ~1879 |
| Walter Hoffman | Son | — | 18 | ~1922 |
| Ethel Hoffman | Daughter | — | 16 | ~1924 |
| Harold Hoffman | Son | — | 14 | ~1926 |
| Laura Hoffman | Spouse | — | 45 | ~1895 |
| Donald Hoffman | Son | — | 8 | ~1932 |
Census Appearances
1930
Rock, Minnesota
Son, age
Rock, Minnesota · implied b. ~1930 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hoffman |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Minnesota |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Minnesota |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
1940
Rock-County, Minnesota
Son, age 10
Rock-County, Minnesota · implied b. ~1930 — 10 household members
| Surname | Hoffman |
| Given Name | Robert M |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Rock |
| Highest Grade | No 3 |
| 1935 Residence | Minnesota |
| 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 Robert Hoffman across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Hoffman
Son · 1940 · age 10 · b. ~1930 · Minnesota
★ You are viewing this record
Sibling
Ethel Hoffman
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Hoffman
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edna Hoffman
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harold Hoffman
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Roy Hoffman
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Hoffman
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 — Rock-County, Minnesota
Open full size
1940 US Federal Census — Rock-County, Minnesota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01954-00081)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ernest L Hemme | 54 | Head | Farmer | Minnesota |
| 42 | Anne Hemme | 71 | mother | — | Iowa |
| 43 | Alfreda Hemme | 34 | sister | — | Minnesota |
| 44 | Emil F Hemme | 28 | brother | — | Minnesota |
| 45 | John M Thurow | 40 | Head | Farmer | Minnesota |
| 46 | Elsie M Thurow | 35 | wife | Farmer | Iowa |
| 47 | Alfred J. Thurow | 3 | Son | — | Minnesota |
| 48 | Lowell M Thurow | 3 | Son | — | Minnesota |
| 49 | Gertrude H Thurow | 28 | sister | — | Minnesota |
| 50 | Inga M Kyrtude | 65 | Head | — | Minnesota |
| 51 | Walter A. Swenson | 40 | Hired manager | Farm Manager | Minnesota |
| 52 | Helen Swenson | 28 | Hired manager's wife | Housekeeping | Minnesota |
| 53 | Glenn A Swenson | 4 | Hired manager's son | — | Minnesota |
| 54 | Gordon J Swenson | 1 | Hired manager's son | — | Minnesota |
| 55 | Marlis May Swenson | 0 | Hired manager's daughter | — | Minnesota |
| 56 | Ernest J Dunn | 56 | Hired hand | Farm Laborer | England |
| 57 | Ragner O Olson | 38 | Hired hand | Farm Laborer | Norway |
| 58 | John A Piper | 62 | Lodger | — | Pennsylvania |
| 59 | Eles Woltjer | 53 | Head | Farmer | Holland |
| 60 | Gertrude Woltjer | 45 | wife | — | Illinois |
| 61 | Ella Woltjer | 15 | daughter | — | Minnesota |
| 62 | Esther Woltjer | 10 | daughter | — | Minnesota |
| 63 | Clara Woltjer | 7 | daughter | — | Minnesota |
| 64 | Ivan Ross | 40 | Hired man | Farm Laborer | Iowa |
| 65 | Paul W Groth | 35 | Head | Farmer | Minnesota |
| 66 | Magdalena A. Groth | 33 | wife | — | Nebraska |
| 67 | Roger P Groth | 4 | Son | — | Minnesota |
| 68 | Corine B. Groth | 2 | daughter | — | Minnesota |
| 69 | Adolph G Hoffman | 61 | Head | Carpenter | Iowa |
| 70 | Laura M Hoffman | 45 | wife | — | Minnesota |
| 71 | Roy E Hoffman | 19 | Son | Farmer | Minnesota |
| 72 | Walter G Hoffman | 18 | Son | Bookkeeping | Minnesota |
| 73 | Ethel M. Hoffman | 16 | daughter | — | Minnesota |
| 74 | Harold E Hoffman | 14 | Son | — | Minnesota |
| 75 | Edna M Hoffman | 11 | daughter | — | Minnesota |
| 76 | Robert M Hoffman THIS PERSON | 10 | Son | — | Minnesota |
| 77 | Donald A Hoffman | 8 | Son | — | Minnesota |
| 78 | Mary A Koll | 70 | mother-in-law | — | Ohio |
| 79 | Ole R Halverson | 60 | Head | Farmer | Minnesota |
| 80 | Edith C Halverson | 56 | wife | — | Minnesota |
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)