JC
John Carr — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Dubuque-County, Iowa
Our Model Tree links this John Carr across the 1920, 1930 and 1940 US Censuses in Dubuque-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1862), then head of a 3-person household.
Age 78
b. ~1862
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Dubuque-County, Iowa |
| Surname | Carr |
| Given Name | John V. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 78 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Dubuque |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | 5 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Dubuque |
| Est. Birth Year | ~1862 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Julia Carr | Daughter | — | 34 | ~1906 |
| John Carr | Head | — | 78 | ~1862 |
| Sarah Carr | Spouse | — | 70 | ~1870 |
Census Appearances
1920
Dubuque, Iowa
Head, age 56
Dubuque, Iowa · implied b. ~1864 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Corr |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Iowa |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Farmer |
| Industry | General Farm |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Dubuque, Iowa
Head, age 67
Dubuque, Iowa · implied b. ~1863 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carr |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 67 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 32 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | Farmer |
| Industry | General farm |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Dubuque-County, Iowa
Head, age 78
Dubuque-County, Iowa · implied b. ~1862 — 3 household members
| Surname | Carr |
| Given Name | John V. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 78 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Dubuque |
| Income (1939) | 0 |
| Highest Grade | 5 |
| 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 John Carr across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Carr
Head · 1940 · age 78 · b. ~1862 · Iowa
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Dubuque-County, Iowa
Open full size
1940 US Federal Census — Dubuque-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01158-01042)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John G. Helbing | 67 | Head | — | Illinois |
| 2 | Susan Helbing | 65 | Wife | — | Iowa |
| 3 | Albert Helbing | 63 | Brother | — | Iowa |
| 4 | Edward Graham | 54 | Head | Merchant | Iowa |
| 5 | Irene V. Graham | 52 | Wife | Bookkeeper | Iowa |
| 6 | John Graham | 28 | Son | — | Iowa |
| 7 | John V. Kenter | 64 | Head | — | Iowa |
| 8 | Emma Kenter | 60 | Wife | — | Iowa |
| 9 | Eugene H. Kenter | 23 | Head | Assistant Foreman | Iowa |
| 10 | Marian Kenter | 22 | Wife | — | Iowa |
| 11 | William Vollencweider | 50 | Head | Operator | Iowa |
| 12 | Clara V. Vollencweider | 55 | Wife | — | Dakota |
| 13 | Henry Vollencweider | 23 | Son | — | Iowa |
| 14 | Ruth Vollencweider | 21 | Daughter | — | Iowa |
| 15 | J. Fred Kureter | 59 | Head | Foreman | Germany |
| 16 | Ellie Lee Kureter | 58 | Wife | — | Mississippi |
| 17 | Madeline Engel | 62 | Head | Houseworker | Luxemburg |
| 18 | Elizabeth Engel | 53 | Daughter | Operator | Luxemburg |
| 19 | Anne V. Lange | 65 | Head | — | Iowa |
| 20 | Arthur J. Lange | 33 | Son | Salesman | Iowa |
| 21 | Joseph J. Kane | 60 | Head | Salesman | Wisconsin |
| 22 | Grace Kane | 51 | Wife | — | Iowa |
| 23 | James T. Kane | 21 | Son | — | Iowa |
| 24 | Anne Cate | 75 | Lodger | — | Iowa |
| 25 | Charles Tufford | 50 | Head | Woodworker | Iowa |
| 26 | Minnie Tufford | 53 | Wife | — | Illinois |
| 27 | Henry Altman | 70 | Head | — | Germany |
| 28 | Margreth Altman | 71 | Wife | — | Iowa |
| 29 | John V. Carr THIS PERSON | 78 | Head | — | Iowa |
| 30 | Sarah Carr | 70 | Wife | — | Iowa |
| 31 | Julia Carr | 34 | Daughter | Houseworker | Iowa |
| 32 | Mary V. Quillien | 63 | Head | Houseworker | Iowa |
| 33 | Robert V. Dehart | 34 | Lodger | Meat Manager | Nebraska |
| 34 | Opha T. Dehart | 12 | Lodger | — | Nebraska |
| 35 | Effie Kearney | 58 | Head | — | Iowa |
| 36 | Otto J. Bunker | 48 | Head | Salesman | Wisconsin |
| 37 | Rose Stohl | 79 | Mother-in-law | — | Ireland |
| 38 | Marcella V. Bunker | 40 | Wife | Saleslady | Wisconsin |
| 39 | Nathaniel Coarance | 73 | Head | — | Iowa |
| 40 | Blanche Coarance | 68 | Wife | Houseworker | Illinois |
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)