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William Koch — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Essex, New Jersey
Our Model Tree links this William Koch across the 1920 and 1930 US Censuses in Essex, New Jersey (XGBoost, ~Confirmed) — first a son (b.~1917), then head of a 7-person household.
Age 13
b. ~1917
Male
Son
Born: New Jersey
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Essex, New Jersey |
| Surname | Koch |
| Given Name | William Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Irvington Town |
| 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.
7 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| William Koch | Son | — | 13 | ~1917 |
| Jacob Koch | Son | — | 7 | ~1923 |
| William Koch | Head | — | 34 | ~1896 |
| Ida Petz | Other | — | 49 | ~1881 |
| Ruth Koch | Daughter | — | 11 | ~1919 |
| Harry Koch | Son | — | 9 | ~1921 |
| Bertha Koch | Spouse | — | 30 | ~1900 |
Census Appearances
1920
Essex, New …
Son, age 3
Essex, New Jersey · implied b. ~1917 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | William Jr. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Occupation | none |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Essex, New …
Son, age 13
Essex, New Jersey · implied b. ~1917 — 7 household members
| Surname | Koch |
| Given Name | William Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | New Jersey |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 William Koch across 2 US Census years (1920 and 1930) in Essex, New Jersey, using XGBoost record linkage.
Show:
This person
Anchor record
William Koch
Son · 1930 · age 13 · b. ~1917 · New Jersey
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Sibling
Harry Koch
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruth Koch
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jacob Koch
Sibling · 1930 · age 7
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 — Essex, New Jersey
Open full size
1930 US Federal Census — Essex, New Jersey
Page Contents
50 people indexed on this census page (ia:1930:newjerseycensus00reel1330:0962)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Marguerite M Lisowsky | 0 | Daughter | — | New Jersey |
| 52 | George Lisowsky | 18 | Son | Pattern-Maker | New Jersey |
| 53 | Jean Jr. Hornig | 46 | Head | Inspector | Connecticut |
| 54 | Helene G. Hornig | 39 | Sister | Cook | Connecticut |
| 55 | James C. Hornig | 48 | Brother | Operator | Connecticut |
| 56 | Gustave H. Schmidt | 70 | Head | — | Germany |
| 57 | Anna Schmidt | 60 | Wife | — | New Jersey |
| 58 | Elmer C. Schmidt | 28 | Son | Service Clerk | New Jersey |
| 59 | Earl G. (Ab) Price | 28 | Head | Mach. Engineer | New Jersey |
| 60 | Margaret L. Price | 26 | Wife | — | New Jersey |
| 61 | Amelia J. Endlich | 52 | Mother-in-law | Jewelery | New Jersey |
| 62 | Frank A. Schoener | 40 | Head | Assembler | Germany |
| 63 | Emma Schoener | 39 | Wife | — | New Jersey |
| 64 | Emma E. Schoener | 16 | Daughter | Solarist | New Jersey |
| 65 | Ernest D. Price | 26 | Brother | Photographer | New Jersey |
| 66 | William E. Koch | 34 | Head | Machinist | New Jersey |
| 67 | Bertha Koch | 30 | Wife | — | New Jersey |
| 68 | William Jr. Koch THIS PERSON | 13 | Son | — | New Jersey |
| 69 | Ruth Koch | 11 | Daughter | — | New Jersey |
| 70 | Harry G. Koch | 9 | Son | — | New Jersey |
| 71 | Jacob E. Koch | 7 | Son | — | New Jersey |
| 72 | Ida Petz | 49 | Mother-in-law | — | New Jersey |
| 73 | Jacob Stampfle | 41 | Head | Teamster | New Jersey |
| 74 | Elizabeth B. Stampfle | 43 | Wife | — | New Jersey |
| 75 | Irene E. Stampfle | 23 | Daughter | Stenographer | New Jersey |
| 76 | Joseph E. Stampfle | 21 | Son | — | New Jersey |
| 77 | Jacob Jr. Stampfle | 7 | Son | — | New Jersey |
| 78 | James W. Hook | 51 | Head | Cashier | Massachusetts |
| 79 | Margaret S. Hook | 49 | Wife | — | New Jersey |
| 80 | Cora L. Hook | 18 | Daughter | Typist | New Jersey |
| 81 | Harry P. Hook | 16 | Son | — | New Jersey |
| 82 | Arthur J. Hook | 14 | Son | — | New Jersey |
| 83 | Elizabeth E. Hook | 13 | Daughter | — | New Jersey |
| 84 | Charles B. Dambach | 33 | Head | Auto Mechanic | New Jersey |
| 85 | Josephine Dambach | 38 | Wife | — | New Jersey |
| 86 | William J. Dambach | 7 | Adopted Son | — | New Jersey |
| 87 | Joseph Smith | 44 | Head | Policeman | New Jersey |
| 88 | Mae E. Smith | 42 | Wife | — | New Jersey |
| 89 | John Hoffard | 58 | Head | Painter | France |
| 90 | Carrie Hoffard | 53 | Wife | — | France |
| 91 | Elizabeth Gee | 32 | Daughter | Operator | New Jersey |
| 92 | Dorothy Gee | 8 | Granddaughter | — | New Jersey |
| 93 | William H. Henningson | 37 | Head | Mason | New Jersey |
| 94 | Julia A. Henningson | 38 | Wife | — | New Jersey |
| 95 | Dorothy L. Henningson | 11 | Daughter | — | New Jersey |
| 96 | Peter Henningson | 61 | Father | Mason | Germany |
| 97 | Mary Henningson | 61 | Mother | — | New York |
| 98 | Otto Henningson | 25 | Brother | Mason | New Jersey |
| 99 | Fred A. Henningson | 20 | Brother | Mason | New Jersey |
| 100 | Robert Anderson | 46 | Head | Mason | New Jersey |
Related Census Records
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)