JK
John Kramer — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Dubuque, Iowa
Our Model Tree links this John Kramer across the 1930 and 1940 US Censuses in Dubuque, Iowa (XGBoost, ~Confirmed) — first a son (b.~1917), then head of a 11-person household.
Age 13
b. ~1917
Male
Son
Born: Iowa
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Dubuque, Iowa |
| Surname | Kramer |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Cascade Part Of |
| Est. Birth Year | ~1917 |
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.
11 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Esther Kramer | Daughter | — | 15 | ~1915 |
| Lavonne Kramer | Daughter | — | 10 | ~1920 |
| Kathleen Kramer | Daughter | — | 17 | ~1913 |
| Margaret Kramer | Daughter | — | 19 | ~1911 |
| Hugh Kramer | Head | — | 52 | ~1878 |
| John Kramer | Other | — | 62 | ~1868 |
| Henry Kramer | Son | — | 4 | ~1926 |
| Nicholas Kramer | Son | — | 8 | ~1922 |
| John Kramer | Son | — | 13 | ~1917 |
| James Kramer | Son | — | 6 | ~1924 |
| Calista Kramer | Spouse | — | 45 | ~1885 |
Census Appearances
1930
Dubuque, Iowa
Son, age 13
Dubuque, Iowa · implied b. ~1917 — 11 household members
| Surname | Kramer |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Dubuque-County, Iowa
Son, age 23
Dubuque-County, Iowa · implied b. ~1917 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kremer |
| Given Name | John H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Cascade Township |
| Occupation | Farm Laborer |
| Industry | Farm |
| Class of Worker | W |
| Hours Worked | 60 |
| Income (1939) | 552 |
| Highest Grade | 8 |
| 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 Kramer across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Kramer
Son · 1930 · age 13 · b. ~1917 · Iowa
★ You are viewing this record
Sibling
Margaret Kramer
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Henry Kramer
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nicholas Kramer
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lavonne Kramer
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Esther Kramer
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kathleen Kramer
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Kramer
Sibling · 1930 · 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
1930 US Federal Census — Dubuque, Iowa
Open full size
1930 US Federal Census — Dubuque, Iowa
Page Contents
50 people indexed on this census page (ia:1930:iowacensus00reel653:0599)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Stewart Martin | 61 | Head | Farmer | Iowa |
| 2 | Mary Martin | 63 | Wife | — | Iowa |
| 3 | Paul Martin | 36 | Son | Laborer | Iowa |
| 4 | Ray Ball | 31 | Head | Laborer | S. Dakota |
| 5 | Lenore Ball | 24 | Wife | — | Iowa |
| 6 | Antone Gress | 39 | Head | Farmer | Iowa |
| 7 | Veronica Gress | 39 | Wife | — | Iowa |
| 8 | Urban Gress | 17 | Son | Laborer | Iowa |
| 9 | Gertrude Gress | 15 | Daughter | — | Iowa |
| 10 | Lawrence Gress | 14 | Son | — | Iowa |
| 11 | Edmond Gress | 10 | Son | — | Iowa |
| 12 | Melvin Gress | 8 | Son | — | Iowa |
| 13 | Dolores Gress | 4 | Daughter | — | Iowa |
| 14 | Wm Aitchison | 41 | Head | Farmer | Iowa |
| 15 | Mary Aitchison | 37 | Wife | — | Iowa |
| 16 | Richard O'Connell | 62 | Boarder | Laborer | Free State |
| 17 | Cornelius Steger | 29 | Head | Farmer | Iowa |
| 18 | Anna Steger | 26 | Wife | — | Iowa |
| 19 | Eldon Steger | 3 | Son | — | Iowa |
| 20 | Harold Steger | 1 | Son | — | Iowa |
| 21 | Hugh Kramer | 52 | Head | Farmer | Iowa |
| 22 | Calista Kramer | 45 | Wife | — | Iowa |
| 23 | Margaret Kramer | 19 | Daughter | — | Iowa |
| 24 | Kathleen Kramer | 17 | Daughter | — | Iowa |
| 25 | Esther Kramer | 15 | Daughter | — | Iowa |
| 26 | John Kramer THIS PERSON | 13 | Son | — | Iowa |
| 27 | Lavonne Kramer | 10 | Daughter | — | Iowa |
| 28 | Nicholas Kramer | 8 | Son | — | Iowa |
| 29 | James Kramer | 6 | Son | — | Iowa |
| 30 | Henry Kramer | 4 | Son | — | Iowa |
| 31 | John Kramer | 62 | Brother | — | Iowa |
| 32 | Albert Aitchison | 67 | Head | Farmer | Illinois |
| 33 | Sarah Aitchison | 73 | Wife | — | Iowa |
| 34 | Philip Frazer | 30 | Head | Farmer | Iowa |
| 35 | Rosella Frazer | 23 | Wife | — | Iowa |
| 36 | Eldon Frazer | 2 | Son | — | Iowa |
| 37 | Henry Frazer | 67 | Father | — | Germany |
| 38 | Joseph Frazer | 20 | Brother | Laborer | Iowa |
| 39 | Charles Harding | 70 | Head | Farmer | Iowa |
| 40 | Wilhelmina Harding | 53 | Wife | — | Germany |
| 41 | Bernice Harding | 20 | Daughter | Teacher | Iowa |
| 42 | Myron Harding | 17 | Son | — | Iowa |
| 43 | Robert Harding | 13 | Son | — | Iowa |
| 44 | Grace Harding | 5 | Daughter | — | Iowa |
| 45 | Arthur Hawkins | 43 | Head | Farmer | Iowa |
| 46 | Ivan Hawkins | 37 | Brother | Laborer | Iowa |
| 47 | Olive Mayhart | 28 | Servant | Servant | Iowa |
| 48 | Hazel Marlon | 30 | Boarder | Teacher | Iowa |
| 49 | Jack Swanton | 20 | Boarder | Laborer | England |
| 50 | August Hill | 72 | Boarder | Laborer | Austria |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)